PRTG Network Monitor Version History

Release Notes for the "Preview" Release Channel

Software versions in this channel are updated about once a week. Please consider these versions as "beta". They have been thoroughly tested in our labs, but there may still be limitations in certain monitoring configurations. Please do not use this version on live systems on which you have to rely on!

Please use the "Auto-Update" feature to update your PRTG installation with the latest preview version: In the PRTG web interface, navigate to Setup | Auto Update.

Manual: Using the "Software Auto-Update" Function of PRTG

Other Release Channels

February 12th 2016 - Version 16.1.22.1983/1984 [Preview]

Several minor fixes

February 11th 2016 - Version 16.1.22.1919/1920 [Preview]

Important: We renewed the certificates with which we sign PRTG. We strongly recommend that you update to this version to be able to seamlessly update to future versions of PRTG.

Improved [Security]: We fixed the root cause for the security issue that has been hotfixed with PRTG version 16.1.21.1441/1442 [Preview]. This version also contains various optimizations in context of this security flaw.

New [Sensors]:
- The new Docker Container Status BETA sensor monitors status, uptime, exit code, CPU usage, and memory of a Docker container. Note: To use this sensor type in PRTG, you have to provide certificate and private key to request data from your Docker instance. Please see this article for details: https://kb.paessler.com/en/topic/67250
- The new Amazon CloudWatch Alarm BETA sensor monitors the status of configured alarms for CloudWatch services via the AWS CloudWatch API.
New [Reports]:

You can now generate CSV and XML data files along with the PDF file of a report for its data tables. This is a great option to import data into other programs!
We added a new PDF generator for reports to PRTG.

Improved [Server]: Performance improvements for the web server

Improved [Sensors]:
- You can now define a scaling factor (multiplication and division) for values of sensor channels with custom units. You can find this option in the respective channel settings. Note: Sensors with a scaling option in the sensor settings do not provide this option in channel settings. There are also some other sensors with custom units that do not support this feature.
- The EXE/Script Advanced sensor can now make use of a meta-scan functionality. For details please see this article: https://kb.paessler.com/en/topic/68109
- HTTP Transaction sensor shows the URL of the page that provokes a warning or error status in the sensor message.
- Newly added SSL Certificate Expiry sensors have limits for the "Days to Expiration" channel by default.
- Improved performance for the SNMP Cisco System Health sensor
- SNMP sensors now use paging for SNMP requests to improve their stability.
- Improved logging ("Write result to disk") for the SSL Certificate sensor. With this option enabled certificates of the cert chain are additionally logged for better debugging possibilities, especially for the "Root Authority Trusted" channel.
- You can define a custom port for the Windows Updates Status (Powershell) sensor.
- All WMI/Windows sensors provide a debug option.
Changed [WebGUI]: We removed the outdated option to automatically refresh whole PRTG pages from the account settings. By default, PRTG only refreshes single page elements. You can still disable auto refresh completely.

Bugfixes [Sensors]:
- The SSH SAN System Health sensor adapts an HP firmware upgrade. After the firmware update, some sensor channels might show different data than before. Please try to add this sensor anew to get correct channel data. The corresponding error message is: The sensor encountered some problems. This might be caused by a firmware upgrade. Please try to recreate the sensor.
- SNMP Custom Advanced and SNMP Custom Table sensors did not properly take the unit "BytesBandwidth" if you changed the configuration of this unit in a parent device or group.
- Dell PowerVault MDi Logical Disk sensor now correctly recognizes disk with a minus (-) sign or an underscore (_) in the name.
- SSL Security Check sensor prevents connection timeouts in a better way.
- SNMP Cisco System Health sensor now shows correct memory utilization above 4 GB.
- We fixed an issue that caused an "index out of bounds" error in some cases when adding the SNMP Dell PowerEdge Physical Disk sensor.
- Fix for Int32 errors of NetApp cDOT sensors (support of Int64 values added). cDOT I/O and cDOT System Health sensors also perform a meta-scan when you add one of these sensor types, so you can create one sensor for one system node. This approach fixes wrong values for the "uptime" channel of the cDOT System Health sensor. Please add these sensors anew to apply the fixes.
- SCVMM sensors now show correct status values.
- Packet Sniffer sensor shows selected network adapter(s) again.
- Windows Network Card sensor correctly shows 64 bit values.
- Improved template handling of the SNMP Printer sensor
- SSL Certificate sensor shows an "Unknown" status instead an error if the key length check fails.
- OIDs for the SNMP Custom Advanced sensor support can start with points (.)
- Adding the SSL Certificate sensor using a device template works correctly.
- SNMP Cisco System Health can show negative values.
Bugfix [Notifications]: Placeholders in notification emails were not replaced correctly in certain cases.
Stability improvements for custom lookups
Updated user manual
Updated language files
Many small fixes and improvements for web interface, Enterprise Console, and all other parts of PRTG

January 25th 2016 - Version 16.1.21.1441/1442 [Preview]

Important: Critical security update for PRTG! During our internal tests we discovered a possible vulnerability in PRTG versions 15.2.16.2229/2230 through 16.1.21.1257/1258. In these versions a "path traversal attack" was possible under certain circumstances. This vulnerability is very unlikely to be exploited and we do not know of any case where this has actually happened. We will not publish technical details to not put the affected versions at risk.

To secure your PRTG server please update to PRTG version 16.1.21.1421/1422 or later immediately! Of course, you can contact our Customer Service team if you need assistance.

Hotfix for EXE notifications and PDF reports
WMI Service sensors receive data again after executing the automatic "Start/restart service" option.
Updated language files: Brazilian, Chinese, French, Spanish

December 14th 2015 - Version 15.4.21.5477/5478 [Preview]

Changed [Email Notifications]: For text only email notifications, you can enter custom text with placeholders. In the email notifications settings, choose the option "Text with custom content" for the setting "Format" and provide custom content in plain text format.
Bugfixes [Email Notifications]:

PRTG sends plain text emails with the correct 'text/plain' content type now.
Forwarding HTML emails with Outlook caused broken links in these emails. This works correctly now.
Note: If you have already installed a previous 15.4.21 version, please adjust header_custom.htm manually as described in https://kb.paessler.com/en/topic/65782

Bugfix [Sensors]: The HTTP sensor and the HTTP Advanced sensor now properly work with Server Name Indication (SNI).
Important: Depending on the current endpoint configuration of the target webpage, this change can result in malfunctioning sensors that worked correctly so far. Please see this Knowledge Base article for details: https://kb.paessler.com/en/topic/67398

Creating Toplists works again.
Saving changes to the settings of Ping sensors works again.
Several minor fixes to the web interface and Enterprise Console

November 19th - Version 15.4.21.4959/4960 [Preview]

New [Sensors]: You can now use 4 different sensor types to monitor your NetApp clustered Data ONTAP (cDOT) storage system. They access the cDOT web API via SOAP and can monitor your

NetApp cDOT Aggregate,
NetApp cDOT I/O,
NetApp cDOT Physical Disk,
and NetApp cDOT System Health.

New/Changed [Emails]: PRTG sends out emails in beautiful HTML now, for example, email notifications. With this improvement we also removed the “email options” in the notification delivery settings for the ease of use. You can include your custom logo and footer now using the delivered HTML template file. For details, please see this article: https://kb.paessler.com/en/topic/65782
Important note: Custom email headers and footers that you have defined in the email options of previous PRTG versions will not be used anymore! Please edit them in the HTML email templates again as described in the article linked above.

New [WebGUI]: The PRTG welcome page and the help and support center come with a new fresh design! The welcome page is now similar to a dashboard and shows for example, all current alarms, open tickets, and information about your license. It is now an even better starting point for your everyday network monitoring! If you have any questions about, for example, your license, you can now also directly send a message to our customer support using a contact form on the help center.

Improved [Sensors]:
- SSL Certificate sensor shows a warning if the certificate revocation list cannot be queried.
- SNMP Cisco System Health sensor has a better logic for the naming of fans and system health components.
- Syslog and SNMP Trap Receiver sensors are not in beta status anymore.
- SIP Options Ping sensor has a new channel using lookups for status codes.
Improved [Notifications]: You can enable notification delivery debug logging also for Amazon SNS notifications. For details, please see this article: https://kb.paessler.com/en/topic/55363

Security fix regarding user rights

Changed [Sensors]: We renamed the HP BladeSystem sensors to SNMP HP BladeSystem Enclosure System Health and SNMP HP BladeSystem Blade. The channel “Enclosure Condition” of the system health sensor includes the new status “failed”.

Changed [Mobile GUI]: The Mobile Web GUI is deprecated as of now so we will remove this user interface from PRTG soon. For details, please see the article https://kb.paessler.com/en/topic/66920

Bugfixes [Sensors]:
- WMI Microsoft SQL sensors can now monitor instances with an underscore (_) symbol in the name.
- Cloud sensors retry requests for each response code that is not 200 and the read timeout is now 10 seconds.
- Radius v2 sensor can now use passwords that include double quotes (“)
- The DNS sensor properly compares the IP address again.
- SSL Security Check sensor: Fix for “connection refused” errors.
- Amazon CloudWatch RDS sensor now shows correct values for “Free Storage Space” (average instead of sum).
- SMTP&POP3 Roundtrip sensor: Fix for the “log file is open” error that occurred when the debug option has been enabled.
- Exchange Database (Powershell) sensor uses the correct lookup file automatically if you add this sensor anew. For details, please see https://kb.paessler.com/en/topic/66875
- Oracle Tablespace sensor now handles auto-extensible files properly.
Several fixes and improvements for lookups
Updated user manual
Many other improvements and bugfixes for the Enterprise Console and all other parts of PRTG

November 9th - Version 15.4.20.4713/4714 [Preview]

Fix for the SSL Security Check BETA sensor

November 2nd - Version 15.4.20.4585/4586 [Preview]

Minor bugfixes
Security fix for the web interface
Minor fix for the DNS sensor

October 22nd 2015 - Version 15.4.20.4429/4430 [Preview]

Bugfix [WebGUI]: Dropdown menus in tables (for example, on the "Notifications" tab of a monitoring object) did not work properly in Firefox.
Bugfixes [Sensors]: Minor fixes for Cloud HTTP and Cloud Ping sensors and for the Packet Sniffer sensor
Several other minor fixes

October 15th 2015 - Version 15.4.20.4345/4346 [Preview]

New [Sensor]: The new Business Process BETA sensor is a powerful and very flexible sensor that allows you to give a summary status of whole business processes while monitoring several process components. This means that you can create your very own and individual sensor with channels based on data from other sensors ("source sensors") that are specific to your network and show a cumulated sensor status.
New [Server]: You can now set an Access-Control-Allow-Origin HTTP response header via the Windows registry. See https://kb.paessler.com/en/topic/65707 for details.
Improved [Sensors]:
- We changed the approach that the Cloud HTTP and Cloud Ping sensors use to show data.
- The Packet Sniffer sensor uses new libraries and drivers to improve compatibility and performance.
- WMI HDD Health sensor uses now the channel unit “Custom” so that you can use lookups.
Changed [Server]: We use a different JSON library for custom sensors that return data in JSON format.
Changed [PRTG Cloud]: The PRTG cloud is now reachable under https://api.prtgcloud.com:443. Please ensure your PRTG server can reach this address to use Cloud HTTP and Cloud Ping sensors as well as push notifications.
Bugfixes [Sensors]
- MongoDB System Health sensor now supports 64 bit return values.
- Common SaaS sensor sporadically showed an access violation.
- Dell PowerVault MDi Logical Disk sensor could not read disk 0 properly.
- Oracle Tablespace sensor: Fix for the error "Parameter -isdif is missing or Parameter -channelnames is missing"
- WMI Security Center sensor showed a warning status for “up to date, on access scan running”.
- HTTP Data Advanced sensor occasionally showed an error when processing JSON data.

Bugfix [WebGUI]: Automatic logout timer did not work correctly.
The option „Load Lookups" which we temporarily removed is reachable again under Administrative Tools.
Stability improvements
Updated user manual
Many minor improvements and fixes to the Enterprise Console and all other parts of PRTG

October 7th 2015 - Version 15.4.19.4211/4212 [Preview]

Bugfixes [Sensors]:

Some fixes for the SNMP RMON sensor
Adding sensors with an OIDlib containing lookup definitions failed with "invalid pointer operation".
Port sensor could show strange values in some scenarios.

Updated language files

September 21st 2015 - Version 15.3.19.4031/4032 [Preview]

Saving sensor settings did not work when section Schedules, Dependencies, and Maintenance Window was open (inheritance unmarked).
Some other minor fixes

September 11th 2015 - Version 15.3.19.3953/3954 [Preview]

HTTP sensors: SNI domain was not set correctly
Some other minor fixes

September 7th 2015 - Version 15.3.19.3881/3882 [Preview]

New [Sensors]:
- The Common SaaS BETA sensor monitors the response times of several common Software as a Service providers like Google Apps, Office 365, Salesforce, and GitHub. PRTG adds this sensor to each probe device automatically, so you get alerts immediately if your cloud services are not reachable anymore.
- This version also includes 4 new sensor types to monitor the cloud services Dropbox, Microsoft OneDrive, Google Analytics, and Google Drive.
- We replaced the Amazon CloudWatch sensor. You can now choose between 7 CloudWatch BETA sensors, each one dedicated to one CloudWatch service: EBS, EC2, ElastiCache, ELB, RDS, SNS, and SQS.
- The new Python Script Advanced sensor can execute a Python script that returns valid JSON or XML and show values in different channels.
- The SSL Certificate BETA sensor monitors the certificate of a secure SSL/TLS connection. This sensor type supersedes the outdated HTTP SSL Certificate Expiry sensor.
- The VMware Datastore (SOAP) sensor monitors the disk usage of a VMware data store. This sensor type supersedes the outdated SSH VMWare ESX(i) Disk sensor. The VMware (SOAP) sensors now also support session pooling. You can define session pooling in the device settings.
New [WebGUI]: New installations of PRTG will automatically show an initial device tree with devices and sensors in the network. PRTG starts creating it already during the install process of the PRTG server. This happens super-fast so you can see monitoring data at the first start without filling out any forms or going through any detailed setup steps!
Improved [Notifications]: You can now specify the encoding for syslog messages. Choose between UTF-8 or ANSI for this notification type.
Improved [Libraries]: The libraries overview now shows the security context for each library, which is the user account that created the library.
Improved [Server]: Stability and performance improvements for lookups.
Changed [WebGUI]: We replaced the Configuration Guru from PRTG with a new setup assistant. This Smart Setup is less complex than the "old" guru and helps creating an initial monitoring setup that already shows interesting data about a network.
Changed [Security]: If the port that is originally configured for the PRTG webserver is not available when using a secure SSL connection, the server now tries port 8443 as fallback to keep the secure connection. If this port is also not available, PRTG tries from port 32000 on until it finds an available port and keeps the SSL connection.
Changed [WebGUI]: New installations do not have an automatic object numbering anymore. If you add new sensors, reports, maps, or libraries, the object name will not get a number appended. For details, see this article: https://kb.paessler.com/en/topic/53903
Note: Existing installations which update to this version are not affected. If you want this behavior, you have to edit the Windows registry manually as described in the article linked above.
Changed [Maps]: We replaced existing default icons (PNGs) with SVGs for a better scaling. This changes also the icons in already existing maps. Note that this might affect the look of your existing maps, so please check them after the update.
Improved/Changed [Sensors]:
- The minimum scanning interval for the Windows Updates Status (Powershell) sensor is now fixed at 60 minutes (1 hour).
- Oracle SQL v2 and Oracle Tablespace sensors support the service name in addition to the SID to identify the target instance.
- SNMP Custom Table sensor has two new placeholders for name templates: [tablename] and [rowidentifier]
- The VMware Host Hardware Status (SOAP) sensor can now ignore known warnings and errors from the VMware host.
Bugfix [Probes]: The PRTG Probe service does not change the timezone value in the Windows registry anymore.
Bugfixes [WebGUI]: Security fix for the web interface.
Bugfixes [Sensors]:
- SNMP RMON sensor: Port name update with ifalias did not work and the channel mask mechanism “32bit only” did not work.
- SNMP Custom Table sensor: Default selection for the channel column field caused an OID error.
- SNMP LenovoEMC Physical Disk sensor: We adjusted the used OID to the new Lenovo version.
- SNMP Dell PowerEdge Physical Disk sensor used the wrong lookups for iDrac
- Event Log (Windows API) could not use more than one EventID erroneously.
- SNMP Cisco System Health sensor: We fixed a bug that caused an error with the message “[number] is not a valid integer”.
- Dell PowerVault MDi Logical Disk sensor could not find virtual drives.
- SSH sensors support the symmetric ciphers AES192 and AES256
- SNMP HP ProLiant Network Interface sensor could not find network adapters because of incorrect MAC addresses.
- SQL v2 and HTTP Data Advanced sensors did not calculate difference channels correctly.
- We fixed a bug in the Sensor Factory that might have caused strange sensor behavior.
Bugfixes [API]:
- The API call duplicateobject.htm creates a default name if the name parameter in the call is not defined.
- Change trigger (<NotifyChanged>) did not work properly in custom sensor scripts.
Bugfixes [EC]:
- Table requests (for example, sensor lists, alarms) did not work when there was a proxy between EC and PRTG core server.
- Many other fixes and improvements.
Updated user manual
Many other fixes and improvements to all parts of PRTG.

August 31st 2015 - Version 15.3.18.3795/3796 [Preview]

Bugfix [Sensors]: Toplists for Flow and Packet Sniffer sensors contained empty rows (saving an empty selection could corrupt the PRTG configuration)

August 18th 2015 - Version 15.3.18.3589/3590 [Preview]

Bugfix [Sensors]: SNMP Cisco System Health Sensor showed "Memory is not a valid integer value" in some cases

August 12th 2015 - Version 15.3.18.3507/3508 [Preview]

Bugfixes [WebGUI]:

Security fix for the web interface
Object selection did not work when editing dependencies and library nodes
Dropdown lists did not work properly when using Firefox.
User access rights to the "Map Designer" did not work correctly.

Bugfix [Lookups]:

Changing channel settings of custom sensors with lookups caused a damaged display of sensor and channel gauges.
We temporarily removed the option „Load Lookups" from Administrative Tools. It will back in an upcoming version. Until then, please restart your PRTG server manually to (re-)load lookups.

Bugfix [Sensors]: Exchange sensors did not work on probe systems that run on 32-bit Windows versions
Bugfix [GUI]: Date/time picker did not work properly
Bugfix [Core]: Stability improvements for Mini Probe API
Updated user manual

July 13th 2015 - Version 15.3.18.3117/3118 [Preview]

Updated Chinese language version
Updated user manual
Bugfix [Reports]: Corrected sorting of sensors filtered by tag
Some other minor fixes

July 6th 2015 - Version 15.3.18.3043/3044 [Preview]

Maintenance release

June 30th 2015 - Version 15.2.18.2985/2986 [Preview]

New [Sensors]:
- The SNMP Custom Advanced BETA sensor can monitor numerical values from up to 10 custom OIDs in different channels.
- The SNMP Custom Table BETA sensor can monitor numerical values from an OID that returns an SNMP table.
- The Oracle Tablespace BETA sensor can monitor a tablespace on an Oracle server. It shows the online status, the overall status, as well as free space and blocks.
- The Exchange Database DAG (Powershell) sensor can monitor the DAG status of a database on an Exchange server via PowerShell and shows the status of the cluster and replications.
- The SNMP HP BladeSystem Server Blade sensor and the SNMP HP BladeSystem System Health sensor monitor status and system health of HP BladeSystems via SNMP.

Changed [WebGUI/Administration]: You cannot change the Probe Connection Port anymore via the PRTG web interface or via the PRTG Administration Tool. The communication between probes and PRTG server runs on port 23560 by default. Because this standard port is sufficient in most cases, we removed the option to change it in a GUI. If you changed the probe port previously, PRTG will keep this port for probes also after you update to this PRTG version.
Note: If you need to change the probe connection port, please do so in the Windows registry. For details, please see this article: https://kb.paessler.com/en/topic/65084

Improved/Changed [Sensors]:
- Windows Network Card sensor can recognize more network cards.
- Traceroute Hop Count sensor needs .NET 4.0
- WMI Terminal Services (Windows 2008+) supports higher operating systems than Windows 2008 so we added a + sign to its name

Bugfixes [Sensors]:
- Exchange Database and Exchange Mailbox (Powershell) sensors: With this version we provide some important fixes for these sensor types. To take full advantage of these fixes, please add these sensors anew to your PRTG installation!
- DNS sensor now sends the DNS query to the port that you specify in the sensor settings.
- Stability improvements for channel definitions in SQL v2 sensors
- SNMP Physical Memory sensor recognizes changing indexes to avoid No Such Name (SNMP error #2) errors
- Auto-discovery for SSH sensors on Linux systems works with private key
- Microsoft SQLv2 sensor works with SQL servers that use automatic port assignment
- Fixed a parsing error of the MongoDB System Health sensor ("Could not convert variant of type (Null)")
- SNMP Traffic sensor supports angle brackets in ifdescr
A lot of other improvements and fixes to all parts of PRTG.

June 22nd 2015 - Version 15.2.17.2801/2802 [Preview]

New [Remote Probes/Cluster]: PRTG now includes Cluster support for Remote Probes! If you run a PRTG cluster, all your remote probes can now send their monitoring data to all your cluster nodes. As soon as you acknowledge a remote probe connection to your PRTG core server, the connected remote probe will be visible on all your master and failover node(s). The probe connects automatically to the correct IPs and ports of the cluster nodes. You can define the cluster connectivity of each remote probe in its "Administrative Probe Settings". This way, you can still see monitoring data of remote probes even when your master node fails. For more details, please see our blog article Cluster Support for Remote Probes: Failover Nodes Show Remote Probe Data

Bugfix [Notifications]: Stability improvements for push notifications
Minor improvements and fixes

June 2nd 2015 - Version 15.2.17.2515/2516 [Preview]

Changed [Sensors]:
- We removed the Google Analytics sensor because Google does not support the API that this sensor uses anymore. We will work on a new version of this sensor type.
- We renamed the SNMP Juniper System Health sensor to SNMP Juniper NS System Health sensor, where "NS" is for NetScreen, to indicate supported devices in a better way.
Bugfixes [Sensors]:
- We improved the memory usage of the HTTP Transaction sensor.
- SSH sensors can now also scan for available monitoring items if you use a private key for the login into the target device.
Bugfix [Maps]: Links using the IM protocol work now.
Bugfix [Libraries]: Filtering by tags with + and - works as expected again.
Various fixes to the Enterprise Console and other parts of PRTG

May 12th 2015 - Version 15.2.17.2345/2346 [Preview]

New [WebGUI/Server]: You can set up sensors to run at a specific time (or at various specific times) on a day. Using a special syntax, you can define the desired point(s) in time in the "Scanning Interval" settings of the PRTG System Administration. For details, please see the Knowledge Base: https://kb.paessler.com/en/topic/3723

New [Freeware]: There are no restrictions for scanning intervals anymore in the PRTG freeware edition. Like in commercial and trial versions of PRTG, you can now use scanning intervals below 60 seconds (we recommend that you do not use less than 10 second intervals).

Improved/Changed [WebGUI/Server]:

Probe Connection IPs are editable again via the PRTG web interface.
PRTG now creates a log file "mibparser.log" for better debugging of MIB imports.
It is now possible to allow PRTG user accounts with read-only rights to change their passwords by themselves. You can define this option in the corresponding user account settings.
Read-only users cannot view names of security related fields in settings anymore (for example, names of credentials, domains).
Some minor security improvements and fixes.
Stability improvements for Active Directory integration
Maximum length of one entry in summarized email notifications is now 1000 characters (was more limited before).
Access keys for Remote Probes support angle brackets < >
Debug logs for notification delivery (https://kb.paessler.com/en/topic/55363) create one log file for each sent notification.
Performance improvements for Libraries.

Improved/Changed [Sensors]:
- Proxy support for Cloud Ping and Cloud HTTP sensors: These sensor types can use the proxy server as defined in the "Core & Probes" settings of PRTG.
- Update of the SSH library to support additional key exchange mechanisms (diffie-hellman-group14-sha1).
- Several improvements to the IP on DNS Blacklist sensor: As of this version, this sensor type follows the RFC 5782 where IPv4-based DNSxLs (blacklists and whitelists) must contain an entry for 127.0.0.2 for testing purposes. In previous versions the sensor did not check this, providing a false sense of security when using non (or no longer) existing DNS blacklist servers which always report that the IP is not listed. Because of this change, you might get errors now that were not there previously if you request outdated blacklist servers.
- SNMP Cisco ASA VPN Users sensor is limited to 50 users: https://kb.paessler.com/en/topic/64053
- SNMP Cisco System Health sensor gets more specific tags to describe the type of the monitored system health parameters in a better way. Note: This results in losing custom tags when saving this sensor as template.
- Channel names of SNMP Printer sensor have changed, so existing sensors will have unused "undefined" channels after updating. Please add affected sensors anew to get rid of gray channels.
- SNMP Custom String Sensor with improved warning and error messages when using keyword search.
Bugfixes [Sensors]:

Debug setting of MySQL v2 sensors works now. Time format in logs is changed to 24h.
SNMP Juniper System Health now shows correct values for memory/session usage.
Port sensor show a "Read Timed Out" error when using the options to send commands and check response.
Fix for custom units of the Sensor Factory sensor.
SNMP SonicWALL VPN Traffic sensor supports angle brackets < > in policy names.
SNMP Disk Free sensor could not be added to a device via auto-discovery if it had been added and deleted manually before.
PerfCounter Custom sensor supports angle brackets < > in Performance Counters.
HTTP sensors support special characters in the keyword check option.
SQL v2 sensors re-load the query file when it changes.
Fix for the SNMP HP ProLiant Network Interface sensor: This bug caused a "MAC address not found" error.
Windows Network Card sensor: Teamed network adapters with multiple configurations appeared only once when scanning for available monitoring items.

Bugfix [Maps]: Links from public maps to sensors did not work properly.
Updated user manual
Various fixes and improvements to the Enterprise Console
Dozens of other minor fixes and improvements to all parts of PRTG

May 6th 2015 - Version 15.2.16.2287/2288 [Preview]

Maintenance release
Changed [Sensors]: SSL-based sensors do not support SRP (Secure Remote Password) ciphers anymore. Affected sensor types are: HTTP sensors that do not run in "compatibility mode", Port and Port Range sensors, as wells as email sensors (IMAP, POP3, SMTP, roundtrip).

April 28th 2015 - Version 15.2.16.2225/2226 [Preview]

Improved [Server]: Improved downtime calculation
Improved [Sensors]: You can now create SSH VMware ESX(i) Disk sensors on vSphere 6.0 (ESXi 6.0)!
Changed [Sensors]: EXE/Script Advanced sensors now keep all white spaces in channel names which are defined in the returned XML code. Previously this sensor type reduced the number of white spaces in channel names automatically to one. This new behavior might result in new channels for your existing EXE/Script Advanced sensors while older channels do not get data anymore.
Some other minor fixes.

April 15th 2015 - Version 15.2.16.2117/2118 [Preview]

[Core]: Improvements on security, performance, and stability
[Probe]: Improved memory usage for probes
[EC]: Minor fixes for the Enterprise Console
[Reports] Fixed sorting of objects in reports
Other minor improvements and fixes

April 7th 2015 - Version 15.1.16.2023/2024 [Preview]

New [Freeware]: You can now use 100 sensors for free with the Freeware Edition!
New [Sensors]:
- The HTTP Data Advanced BETA sensor can access a web server and retrieve data in XML or JSON encoded format.
- The SNMP Juniper System Health BETA sensor can monitor the system health of a Juniper device.

Improved/Changed [WebGUI/Server]
- Speed improvements for the auto-discovery
- Proxy support for push notifications
- You can disable auto-scaling of PRTG Maps if you append the parameter &noautoscale to a Map's URL
- Settings tabs of sensors and add sensor error dialogs now directly show you sensor requirements, tips, and links to useful articles in the Knowledge Base.
- We limited scanning intervals to max. 10 days for better stability
- PRTG does not start auto-update downloads anymore if there is less than 500 MB disk space available.
- You can now review the history of changes to the settings in the PRTG Administration Tool via the log file \Logs (Debug)\PRTG Administration Tool Changelog.log
- We increased the data purging timeout so that purging a huge amount of data works more reliably.

Improved/Changed [Sensors]
- All sensors that use the .NET framework now need .NET 4.0. This affects these sensor types: FTP Server File Count Sensor, IP on DNS Blacklist Sensor, Pingdom Sensor, PING Jitter Sensor, Traceroute Hop Count Sensor, Windows Logged In Users Sensor, Windows MSMQ Queue Length Sensor
- WMI Custom sensor supports the expression SELECT COUNT(*). You can use this statement if you want the number of entries in the result set to be returned alternatively to a direct value from a field. For example: SELECT COUNT(*) FROM Win32_Process WHERE Name='explorer.exe'
- EXE/Script Advanced sensor: If the <error>-tag in the custom script contains 0 (<error>0</error>), the sensor does not show an error anymore (Before the value was ignored and the existance of the <error> tag itself triggered an error). Note: All other content with the tag still causes an error, including <error/> and <error></error>
- When channel limits are reached, sensors now show the "last message" in addition to the threshold sensor message.
- DHCP sensor now uses "Option: (54) DHCP Server Identifier" as server address, if available
- Dell MDi Physical Disk sensor supports additional Dell MDi devices; stability improvements
- You can now enforce encryption for the Microsoft SQL v2 sensor.
- IMAP Roundtrip sensor now supports the IMAP search command which leads to better performance. It also deletes the roundtrip email more reliably now.
- FTP sensor shows the answer of the target server in the sensor message.
- SSL Security Check sensor is now part of the auto-discovery.
- RDP sensor support IPv6.
- SNMP HP ProLiant System Health sensor has the new channel "Integrated Management Log Status". This channel helps to find out why the sensor throws an error.
- You can now use SQL v2 sensors in custom device templates.
- RADIUS V2 sensor is not "beta" anymore. The previous RADIUS sensor is now deprecated.
- File Content sensor with enhanced settings for encoding and debugging
- SSH sensors with improved debug setting
- Windows Registry sensor reads the (default) entry if you leave "Value Name" empty.
- SSH SAN Physical/Logical Disk sensors provide now an "advanced" command mode to query additional device statistics.
- We added a globe to all cloud sensors to indicate the sensor status in a nice way.
- Stability improvements for flow sensors that use a buggy customflowrules.osr
- SNMP Custom String sensor now always uses its own settings to interpret a value retrieved via Regular Expressions instead of the "Windows Format" settings.
- PerfCounter IIS Application Pool sensor shows the pool status "unavailable" now as an error. We removed the "beta" status for this sensor.
Bugfixes [WebGUI/Server]
- Adding groups to libraries caused an Ajax error
- "Size by Sensors/Priority" for sunburst and treemap view is working again
- Reports were not created for the correct time in certain cases when using "Current Period". We also improved the order of sensors in a report and you can add the same sensor several times to a report.
- You can now sort sensor data tables correctly by channel IDs.
- In some cases, downtime values were calculated incorrectly in table rows.
Bugfixes [Sensors]
- NetApp sensors showed "invalid data" errors if less thresholds than measurements were returned
- IMAP sensor could not handle multipart emails properly
- Quality of Service (QoS) Roundtrip sensor shows correct values for the RTT (Minimum) channel
- Fixed proxy usage for the HTTP SSL Certificate Expiry sensor
- SSH SAN sensors: Scanning for available items sometimes caused memory leaks and the scan did not find a single "drive" without the plural -s.
- SQL v2 sensors: Better handling of special characters.
- Microsoft SQL v2 sensor in some cases used the default port instead of the port configured.
- WMI Custom String sensor: Change Trigger did not work in some cases.
- Syslog and SNMP Trap Receiver sensors with better error handling in case ports are already in use.
- Stability improvements for the Windows Scheduled Task sensor.
- SNMP RMON sensor uses 64 bit counters if available.
- INI File Content Check sensor supports float numbers.

New/Improved [EC]
- We made the Enterprise Console more compatible to PRTG servers that differ in version: It can now connect to every server where the third number in the version number is equal to the third number of the EC version. For example, EC version 15.1.16.2023 can now connect to any server with the version 15.1.16.xxxx
- Enhanced filter options for log tables

Updated language files
Updated user manual
Many other minor improvements and fixes to all parts of PRTG.

March 31st 2015 - Version 15.1.15.2001/2002 [Preview]

Fixed sensor status for SSL Security Check Sensor
Updated user manual
Minor improvements

March 23rd 2015 - 15.1.15.1863/1864 [Preview]

Bugfix [Server/Probes]: Fixed a bug in SSL/TLS connections that could cause very high memory consumption in some cases
Bugfix [Sensors]: Bugfix for QoS Sensors
Bugfix [Sensors]: Table lists of Syslog and SNMP Trap Receivers are sorted correctly again
Bugfix [Toplists]: Cloning sensors with Toplists works correctly again
Bugfixes [EC]: Sorting of table lists works again, as well as generating historic data HTML reports
Bugfix [Cluster]: Re-joining a cluster did not work properly if the failover node was in a cluster before and reverted to standalone temporarily
Updated language files for German, Chinese, Brazilian, Dutch, French, and Spanish
Several stability improvements and fixes

March 6th 2015 - 15.1.15.1685/1686 [Preview]

Bugfix [Sensors]: Bugfix for QoS Sensors
Bugfix [Sensors]: Table lists of Syslog and SNMP Trap Receivers are sorted correctly again
Bugfix [Toplists]: Cloning sensors with Toplists works correctly again
Bugfixes [EC]: Sorting of table lists works again, as well as generating historic data HTML reports
Updated language files for German, Chinese, Brazilian, Dutch, French, and Spanish
Minor improvements and fixes

February 24th 2015 - 15.1.15.1587/1588 [Preview]

Updated language files
Deeper integration of the online help into the PRTG web interface
"Configuration Guru" enhanced with helpful video tutorials
Minor fixes

February 4th 2015 - 15.1.14.1385/1386 [Preview]

Improved/Bugfixes [Sensors]
- SSH SAN System Health sensor now supports devices that provide no other information than name, value, and status.
- Windows Registry sensor correctly queries its parent device again. It mistakenly queried the parent probe before.
- SNMP Windows Service sensor had problems to show service names correctly in some Windows language versions (for example, Russian, Japanese)
- Sensor channels that show if something (for example, a service or device) is on/off or successful/failing have now a more beautiful and comprehensive graphical display.
- WMI Microsoft SQL sensors does not round values of channels with "per second" units to integers anymore. This caused incorrect sensor results for some metrics (for example, for "deadlocks per second") previously.
Improved/Bugfixes [WebGUI/Server]
- Libraries: We preset the filter for „Linked Object" in the Node Display Settings with „Root" for your convenience.
- The PRTG Status page now shows how busy PRTG was for you in the new "Activity History".
- Geo Maps zoom fixed.
- You can make the passhash of your PRTG user account visible with a "Show Passhash" button. We previously removed the passhash display for security reasons.
- Amazon SNS notifications did not work when containing the special characters * or § in subject or message.
- Buttons in the "Compare Sensors" dialog did not work.
- Library node filter "by status" did not work.
New [API]: /api/getsensordetails.json?id=sensorid is the JSON equivalent to the existing XML call.
Updated [Language]: New Japanese language version
Bugfix [MiniProbes]: Stability improvements for connections via PRTG's mini probe interface
Some minor fixes and improvements to the Enterprise Console.
An updated user manual: Now with a neat overview of available channels and screenshots in all sensor chapters!
We also implemented some other minor fixes and improvements to all parts of PRTG that did not make it onto this page.

December 18th 2014 - 14.4.14.3789/3790 [Preview]

New [Sensors]
- SNMP Cisco UCS Blade sensor: monitors the health status of a blade server in a Cisco UCS device.
- SNMP Custom Lookup (BETA) sensor monitors a string value returned by a specific OID and maps it to a sensor status.
- Cloud HTTP (BETA) sensor monitors the loading time of web servers from various locations worldwide via HTTP using the new PRTG cloud
- Cloud Ping (BETA) sensor monitors the ping time to a target device from various locations worldwide using the new PRTG cloud
  Note: You can only use a certain number of Cloud HTTP and Cloud Ping sensors per PRTG installation (currently 5 each). For details, please see this article.

Improved/Changed/Bugfixes [Sensors]
- FTP Server File Count sensor with a dedicated port setting
- SNMP Cisco ASA VPN Traffic sensor has now the option to keep the "Up" status if there is no active connection. You can specify this behavior in the sensor settings.
- QNAP Physical Disk: Damaged disks now result in a "Warning" status of the sensor (instead of an error); this allows to continue monitoring of other values.
- Fixed keyword check of the HTTP Transaction sensor, response strings did not trigger status changes ("response must include"/"response must not include")
- SCVMM sensors: Improvements to version check for add-snapin / import modules
- Various fixes to the "Custom HTTP Headers" function of the HTTP XML/REST Value sensor.
- Debug options ("write result to disk") for HTTP Push Data sensors and Windows Terminal sensors
- Windows Last Update sensor showed a false error message that said that Windows Registry Service is not running in some cases
- SNMP Custom String sensor threw an error for an empty string when triggering a change notification.
- Fixed Smart URL Replacement for HTTP Advanced Sensor in compatibility mode
- More descriptive channel names for Cisco System Health sensors
- MySQL v2 sensor could not process a specific data type ("System.UInt64")
- SSH SAN sensors with better differentiation between "wrong data format" and "timeout" errors
- SNMP Dell PowerEdge System Health sensor could not process channel masks
- Windows Performance Counter sensors sporadically showed an error when a PerfCounter connection had to be re-created
- WMI SQL sensors shows incorrect values for the category "locks"
- File Content sensor with better error handling and transmitting only new lines now optimized also for very large files

New/Improved/Changed [WebGUI/Server]:
- Speed optimizations for auto-discovery
- New API call shows the legend of data graphs (ID, name, unit, color): /api/chartlegend.json?id=[sensor_id]
- Stability improvements to location resolution in Geo Maps
- "Quick ranges" on historic data pages set incorrect dates
- Stability improvements for Toplists
- Restructured "Setup" menu
- Library triggers are now completely independent from the "inherit trigger" switch on the "Notifications" tab of objects in the device tree.
- PRTG Administration Tool does not allow any more to enter used ports when defining ports for web server and probe connections. Improved server restart rules.
- Notifications: Logs now show when a notifications was triggered but could not be delivered because there is no corresponding active notification contact for the target user.
Bugfixes [Core/Server]
- When using the historic data function for "all nodes" in a cluster, percentiles were incorrect.
Bugfixes [EC]:
- Fixed an error when deleting active server connections
- Now showing better default values for start date in date time picker for "Acknowledge Until" and "Pause Until"

Various other improvements and bugfixes to all parts of PRTG, as well as an updated user manual

November 11th 2014 - 14.4.13.3467/3468 [Preview]

Note: This is the most secure PRTG ever built, including a fix for the POODLE problem. But this tightened security has side effects. Most notably all your Enterprise Consoles on client machines will need to be updated manually. Also some SSL based sensors and notifications may be affected. See the following knowledge base article for details: https://kb.paessler.com/en/topic/61769

Note: The PRTG configuration file created by this version is not downwards compatible with previous versions of PRTG. This means, you cannot switch easily between this version and a version number starting with 14.3.11. As soon as you run PRTG version 14.3.12 or later, you can only downgrade to an earlier version of PRTG if you recover the latest configuration file before the update. For more information about recovering a previous configuration file, please see https://kb.paessler.com/en/topic/12313

Note: Important change to the SNMP HP ProLiant System Health sensor! This sensor now uses a more sophisticated method to determine the "Overall Status" channel. The OID we used in the previous version did not work anymore in our labs after updating to the latest software version from HP. The sensor now uses the proper OID and displays the same status as the HP software does. The overall status is not something that PRTG is making up, but it is directly read and displayed from the target system. This can lead to more possible error cases. You will find details about this behavior in the sensor settings. For more information, please see this article: https://kb.paessler.com/en/topic/61805

Bugfix [Server/Probes]: Outgoing IP settings were not synchronized between the "Administrative Probe Settings" in the web interface and the PRTG Administration Tool.
Bugfix [Web Server]: For new installations, the PRTG web server now listens on all IP addresses on the SSL port 443 for incoming HTTPS connections by default. HTTP connections are redirected from port 80 to 443.
Bugfix [Remote Probes]: In some cases the download during automatic Remote Probe updates was canceled too early. The fix will be effective with the next update after this update.
Bugfix [Notifications]: Email notifications (text) containing non-ASCII characters were not correctly encoded.
Bugfix [Sensor]: HTTP Push Data Advanced sensor switches now to "Down" status if the pushed XML defines an error status.
Bugfix [Mini Probes]: Stability improvements for Mini Probe connections.
Some minor fixes to several parts of PRTG and an updated user manual

November 4th 2014 - Version 14.4.13.3399/3400 [Preview]

Note: Important change to the SNMP HP ProLiant System Health sensor! This sensor now uses a more sophisticated method to determine the "Overall Status" channel. The OID we used in the previous version did not work anymore in our labs after updating to the latest software version from HP. The sensor now uses the proper OID and displays the same status as the HP software does. The overall status is not something that PRTG is making up, but it is directly read and displayed from the target system. This can lead to more possible error cases. For details, see this article: https://kb.paessler.com/en/topic/61805

Improved [Sensors]:

AVM FRITZ!Box WAN Interface sensor asks for credentials when you add it manually. Note: If an existing sensor shows an error after a Fritz!OS update, please add the sensor anew to see the new credentials option.
FTP sensor uses explicit Transport-Level Security (TLS) by default
HTTP Full Web Page sensor: PhantomJS SSL protocol supports TLS

Bugfixes [Sensors]:

HTTP sensors automatically perform SSL redirects
QoS One Way Sensor did not open receiver ports
Stability improvements for the sensor types: FTP, IMAP, SMTP&IMAP Round Trip, POP3, SMTP&POP3 Round Trip, SMTP, Port
FTP sensor now offers an option for "unencrypted" connections.
Changed: The FTP sensor now uses "anonymous" as default login if you did not define a user name (before, it did not log in at all if you did not provide credentials). Please make sure the anonymous user is allowed on your target FTP server, or provide valid credentials.
SMTP&POP3 Round Trip Sensor did not correctly disconnect which could lead to timeout errors
HTTP SSL Certificate Expiry Sensor now supports TLS
SNMP Traffic sensors could show an unexpected error in case the "ifadmin" status was not available on the target device

Bugfix [WebGUI]: Multi-edit for channel limits did not work
Bugfix [Cluster]: Stability fix. In rare cases, stability problems could bring a PRTG cluster installation to a complete halt.
Bugfixes [EC]: Sensor graphs were empty for some sensor types (for example, QoS sensors) and several minor fixes for the Enterprise Console.
Several other minor fixes to all parts of PRTG.

October 21st 2014 - Version 14.4.13.3289/3290 [Preview]

This is the most secure PRTG ever built, including a fix for the POODLE problem. But this tightened security has side effects. Most notably all your Enterprise Consoles on client machines will need to be updated manually. Also some SSL based sensors and notifications may be affected. See the following knowledge base article for details: https://kb.paessler.com/en/topic/61769

Improved [Security]: Fix for POODLE: We have already implemented a fix for this SSLv3 security vulnerability and disabled the outdated SSL 3.0 encryption for PRTG. See this article for details.
New [Sensor]: SSL Security Check BETA Sensor checks a target for the allowed SSL protocols and shows a security rating
New [WebGUI]: There is a new visual representation for sensors using lookups with bitfields
Improved [Sensor]: HTTP SSL Certificate Expiry Sensor now checks for revoked certificates
Improved [Sensor]: NetApp sensors can now treat N/A measurements as valid (no error will be triggered if the according option is activated)
Bugfix [Sensor]: SNMP Linux Meminfo sensor showed wrong values in some cases
Bugfix [Cluster]: In a PRTG cluster, not all settings for the cluster connections were correctly deployed
Plus several other improvements and fixes for the Enterprise Console, the web interface and sensors

October 7th 2014 - Version 14.4.13.3157/3158 [Preview]

New: Free-to-Use Push Notifications
With this update, we introduce a great new notification option: You can now send push notifications to your Android or iOS devices—for free, included in every PRTG version, even in the PRTG Freeware! This is a very comfortable way to get alerts from PRTG. All you need is PRTG for Android or PRTG for iOS and you can set up your free push notifications within seconds. Please see the Knowledge Base article How can I send push notifications with PRTG? for details.
Important! Changes to SSL: We had to make substantial changes to the way PRTG negotiates and establishes secure connections. This affects all SSL based functionalities of PRTG. Incidents like Heartbleed, OpenSSL updates, and other causes make these changes necessary. Among others, this concerns notification methods as well as the monitoring with many sensor types that use SSL encryption for their connections. In some cases we could even remove SSL specific settings and replace them with auto-negotiation, for an easier use.

We put a lot of effort into these changes and into not affecting your workflow, but it is still likely that you see some unexpected side effects for your specific environment, systems, and hardware. After this update, please have a close look at your monitoring configuration and be prepared that you might have to work on it afterwards. We try to migrate all settings during the update, but in some cases notifications and/or sensors may stop working and you may need to manually adjust settings.

Note: When used with an https URL, the HTTP sensors mentioned below now try to connect via any accepted SSL/cipher combination, just as a web browser would do.

In detail, the change affects the following areas of PRTG:

Notification methods (when used with encryption):

SMTP (outgoing mail)
SMS
HTTP
Amazon SNS

Sensor types (when used with encryption):

HTTP
HTTP Advanced (with default monitoring engine)
HTTP Content
HTTP Transaction
IMAP
POP3
SMTP
SMTP&IMAP Round Trip
SMTP&POP3 Round Trip
Port
SFTP
FTP
WBEM

New [WebGUI/Server]:

PRTG introduces responsive design so that the webGUI automatically adjusts to the size of your screen. This allows you to see even more information at a glance!
To get a much better and more detailed picture about your devices, PRTG now analyzes the devices you add and recommends appropriate sensor types on the device overview page. Only one click to add a sensor suggestion directly to the device and you never miss important information about your equipment again!
Together with push notifications, we introduce notification contacts. PRTG users can now define and edit their own dedicated ways to get notifications to email address(es), phone number(s), and push device(s). For the notifications types “Send Email”, “Send SMS/Pager Message”, and “Send Push Notification” you can now choose a user or user group from a list to send a notification to the current notification contacts of the according recipient(s).
You can now generate configuration reports for various objects in PRTG like users, user groups, maps, reports, and system configuration. This function is available under Reports | Configuration Reports in the main menu bar.
You can now specify the channels you want to show in historic data graphs that you generate via the "Historic Data" tab of a sensor.
You are now able to zoom into data graphs and to scroll on the time axis with according control buttons to analyze your monitoring data even smarter.
Maps (‘dashboards’) have an auto-scaling option to adapt automatically to your screen size.
You can now enter your PRTG license key directly into the webGUI so you do not need to use the Administrator tool for this purpose anymore.
You can now define a custom port for your Mini Probe connections.
PRTG removes masked passwords that you entered into settings pages from the support bundle and does not send them.

New [Sensors]:

The Dell PowerVault MDi Physical Disk sensor show statistics for a physical drive on a Dell PowerVault storage system. Note: We renamed the existing Dell PowerVault MDi sensor to Dell PowerVault MDi Logical Disk sensor because of this.
The WMI Microsoft SQL Server 2014 sensor monitors the performance of a database
The MongoDB System Health sensor monitors the status of a MongoDB server via HTTP and the admin web console

New [EC]:

Facelift: The new appearance of the Enterprise Console comes with a fresh and clear user interface and new graphics, similar to the webGUI

Improved [WebGUI]:

Map editor with better performance and new map objects “QR codes” and “traffic lights”
PRTG notifies you if Similar Sensors analysis is off
You can filter device lists by tag
You can use the logical operators + (must have) and – (must not have) in library and table tag filters, e.g., -windows would show all sensors/devices that do not have “windows” as tag, +A;B-C would mean “objects with the tags A and B but not with the tag C”
Added a quick print button for QR codes on device lists
Tables have more columns to show more information
The “Compare Sensors” feature has more options to analyze compared data

Improved [Sensors]:

File Content sensor with better error handling
SNMP Traffic sensors with new option to ignore ‘deactivated’ (ifAdminStatus=down) status
WMI Security Center sensor now uses lookups
Channel names of probe and system health sensors are now more meaningful
SNMP Linux Disk Free sensor enhanced with a channel for free INodes
SNMP QNAP sensors use more appropriate OIDs now, including fallback. Note: If you already use QNAP sensors and experience strange values now, please add the sensors anew.
Google Analytics sensor has new metrics (exceptions, fatalExceptions, exceptionsPerScreenview, fatalExceptionsPerScreenview) and allows special characters in the password field.
Hyper-V Virtual Storage Device sensor supports Hyper-V on Windows Server 2012 R2
HTTP XML/REST Value sensor supports Smart URL Replacement and has an optional setting to define custom HTTP headers
Various sensors have now an optional debug log setting
FTP Server File Count sensor supports SSL connections and can count the files in a specific folder or in all subfolders
EXE/Script Advanced, SSH Scrip Advanced, and HTTP Push Data Advanced sensors support now JSON results
Windows Network Card sensor supports teamed adapters on Windows Server 2012
Amazon CloudWatch sensor with additional channels for averages and with more expressive error messages
SNTP sensor supports IPv6 devices and we improved its stability
HTTP Advanced sensor with new authentication method “Digest Access Authentication” and the option to check for keywords in the response
SNMP Custom String sensor has a new setting that allows you to define the format of the result value: String, hexadecimal bytes (e.g., MAC addresses), or decimal bytes (e.g., IP addresses)
Windows MSMQ Queue Length sensor can show the number of messages in outgoing queues
AVM FRITZ!Box WAN Interface sensor asks for credentials when you add it manually. Note: If an existing sensor shows an error after a Fritz!OS update, please add the sensor anew to see the new credentials option.
Complete rework of the RADIUS sensor: better performance and compatibility with RADIUS servers
SNMP Linux Meminfo sensor has 6 new channels to monitor used physical memory, used swap memory, and used memory on the whole system (percentage and absolute values)
SNMP RMON sensors use the “Port Name Template” of the SNMP Compatibility Options of the parent device

Improved [Security]:

We implemented further improvements to the overall security of PRTG for a better protection against potential attacks.
Account pages and QR codes do not include the password hash anymore

Bugfixes [Sensors]:

SNMP Printer sensor can handle negative supply values (error codes)
IMAP sensor now only checks the age of an email if it could process the date correctly
Windows Last Update sensor did not trigger the start of the remote registry service automatically
SSH Script Advanced sensor didn’t show values for the “Execution Time” channel
WMI and SNMP Custom String sensors couldn’t completely display messages with a ‘#’ sign
Some sensors did not work with IPv6 devices although they should do so
The ‘”Value Mode” of sensor channels sometimes calculated incorrect values
SNMP HP ProLiant System Health sensor did not work after an update of "HP Insight Management Agents for Windows Server x64 Editions". Furthermore, this sensor type uses the correct OID for the overall status channel now.
HTTP Transaction sensor: keyword check did not work
Stability improvements for SID connections of the Oracle v2 sensor

Bugfixes [WebGUI/Server]:

Change trigger were not correctly displayed for some sensors
Several fixes to data tables and reports
Auto-Discovery with templates executed a full auto-discovery and not only the selected templates
Ticket search found tickets but didn’t list them
Device template of the Active Directory Replication Errors sensor used wrong AD neighbors
Reports ignored the “hours-of-day” settings for up- and downtime lists
Hover popups appear now faster on group, device, and sensor pages
When a map object file was deleted from the PRTG data folder, it is now possible to remove this object from a map. Before this fix, this was only possible with a workaround.
Stability improvements for map rotation when using custom scripts
Fixed display of min/max values in gauges

Bugfixes [EC]:

Stability improvements and many other fixes

Hundreds of minor fixes and improvements to all parts of PRTG, as well as updates and a facelift for the user manual in your installation.

September 12th 2014 - Version 14.3.12.2945/2946 [Preview]

As soon as you run PRTG version 14.3.12.2673/2674 or later, you can only downgrade to an earlier version of PRTG if you recover the latest configuration file before the update. For more information about recovering a previous configuration file, please see https://kb.paessler.com/en/topic/12313

Bugfixes [Sensors]:

In some configurations, reports generated by the "Historic Data" tab did not include sensor graphs
Syslog Receiver sensor showed structured data multiple times
In some configurations, limits of sensor channels were not correctly interpreted

Bugfixes [Core]:

On some systems, the PRTG installer could not perform a necessary restart in autoupdate mode
On some systems, the Windows shortcut icon that starts the web interface did not work

Bugfix [WebGUI]: Fixed hidden feature /speedtest.htm
Bugfix [Notifications]: Improved handling of error messages in HTTP notifications
Various other improvements and fixes for the Enterprise Console, the Ajax Web Interface, and other parts of PRTG.

August 20th 2014 - Version 14.3.12.2721/2722 [Preview]

Bugfixes

[Sensors]: Fixed a bug that caused failing SNMP sensors when using SNMPv3 with encryption
[Sensors]: Improvements to the recently added SQL (v2) sensors
[Sensors]: Graphs of sensor channels using the "maximum" value mode could show fringed graphs in some cases
[Reports]: In some configurations, reports generated by PRTG did not include sensor graphs
[Security]: Improved security for the PRTG web interface
[WebGUI]: Several minor improvements

August 15th 2014 - Version 14.3.12.2673/2674 [Preview]

New [EC]:

The Enterprise Console now includes a history for Libraries, Maps, and Reports

Improved [Security]:

When sending a "support bundle" with a configuration file to Paessler support, passwords are not included anymore.
Read only users could view a list of Administrator users on the same installation

Bugfixes [Core]:

In rare cases, the PRTG server Windows service could not start any more after the installation. We have fixed this.
Extended stability improvements for outgoing emails and HTTP notifications

Bugfixes [WebGUI]:

The QR code shown in the upper right corner can now be used again with our mobile apps

Bugfixes [Sensors]:

Better stability for HTTP and HTTP Advanced sensors
Extended fields for Syslog sensor
Fixes for HTTP Push Count, HTTP Push Data, and HTTP Push Data Advanced sensors
Fixes for PostgreSQL Sensor

Dozens of other improvements and fixes to the Enterprise Console, the web interface, and all other parts of PRTG.

July 25th 2014 - Version 14.3.12.2509/2510 [Preview]

Extended [Freeware]: We are making the Freeware of PRTG 3 times more valuable! The freeware edition can now monitor up to 30 sensors for free (instead of only 10 sensors)!

New [Sensors]

There are 4 new sensor types for SQL server monitoring: The sensors Microsoft SQL v2, MySQL v2, Oracle v2, and PostgreSQL monitor SQL databases directly using .NET 4.0 and are much more flexible than the previous SQL sensors.
The new SSH SAN Enclosure sensor monitors the health of an enclosure on an SAN that supports CLI over SSH.
You can now specify after how many failed sensor scans a sensor status will be set to a ‘down’ status if a device reports an error. Define this in the "Scanning Interval" setting.
Newly created Ping sensors now send multiple ping requests with 5 pings by default. All requests have to fail to set the sensor in a "down" status. Existing Ping sensors keep their current setting. This will minimize false alarms due to packet loss.
The new open source tool QoS Reflector enables you to use a QoS (Quality of Service) Round Trip sensor without installing a remote probe at the 'end' of the connection. The QoS Reflector is a Python script so that you can use any Linux machine as QoS roundtrip endpoint. See our Knowledge Base for details: https://kb.paessler.com/en/topic/61176

New [WebGUI]: Google Universal Analytics integration: You can track the usage of the WebUI of PRTG in your Google Universal Analytics account. Simply create a Google Analytics Tracking ID in the analytics portal and enter it into PRTG’s system administration settings and PRTG will dynamically integrate it into the website. See our Knowledge Base for details: https://kb.paessler.com/en/topic/61406

Improved [Security]:

We have massively upgraded the encryption security of PRTG’s webserver to make the usage of PRTG even more secure.
We have upgraded the OpenSSL libraries to version 1.0.1h (these are used for SSL connections of the web server, the core/probe and probe/probe connections as well as for most sensor types that offer SSL).
We have locked down the accepted ciphers for SSL connections to the most secure ones that will allow for “Perfect Forward Secrecy” and TLS 1.2, ensuring that a session key derived from a set of long-term keys cannot be compromised if one of the long-term keys is compromised in the future. Even if somebody wire taps your communication with your PRTG server and gets access to your private keys later, he will not be able to decrypt the old data.
Note: Older browsers and older versions of the Enterprise Console may not be able to connect to the PRTG webserver any more. There is an option in the PRTG webserver settings that allows to (temporarily) switch to a compatibility mode with weakened security, so these clients can connect again. Please update your browsers and the Enterprise Console to the latest version.
The admin can set a time after which the WebUI automatically performs a logout to prevent unauthorized access (under System Administration | User Interface).
We are now removing all encrypted passwords from the config.dat file before it is sent to Paessler support in support bundles when the user chooses this function.

Improved [Sensors]:

Amazon CloudWatch Elastic Load Balancer (ELB) sensor has two new channels for the HTTP status codes 3XX and 5XX (analog to the already existing 2XX and 4XX channels)
The File Content sensor allows now to specify the “Read Behavior”: You can choose to process only lines which are appended to the file to improve performance instead of reading the whole file with each sensor scan.
HTTP Push Data sensors have now the option to define an age threshold. If no data is received for this time or longer, the sensor shows an error
The DNS sensor now supports IPv6 requests to monitor DNS servers which are only reachable via an IPv6 address.
The SNMP Traffic sensor has a new option to ignore the ‘disconnected’ status if the port is set correspondingly in the hardware (‘admin down’).

Improved [Templates]: You can now exclude specific sensors from a device when you create a device template.
Improved [Libraries]: Libraries include now "Add Library Node" and “Add Group” buttons similar to the “Add Device” and “Add Group” buttons in the device tree for easier creation of a library.
Improved [Notifications]: New placeholders for syslog receiver and trap receiver notifications show the last 20 entries without any filter before the notification was triggered: %syslogmessages, %trapmessages

Changed [System Administration]:

The PRTG Server Administrator and PRTG Probe Administrator tools are now together in one universal admin tool: The new “PRTG Administrator” tool includes all available probe and core settings (besides the administration settings which you can change via the webGUI).
You can now change administrative probe settings (outgoing IP, restart options) on the "Settings" tab of local and remote probes in the webGUI. This was in the PRTG Probe Administrator tool before.

Changed [Reports]: Scheduled reports will not be executed on failover nodes by default anymore.

Changed [Sensors]: Some sensor types now need .NET 4.0 installed on the probe machine (was .NET 2.0 before). For details, please see the Knowledge Base: https://kb.paessler.com/en/topic/60543

Bugfixes [Sensors]:

Hyper-V sensors can now handle server names which include parentheses “()”
HTTP Push Data sensors didn’t filter correctly for the specified HTTP request method; if there are POST requests, only the postdata part will be processed (has to be "application/x-www-form-urlencoded") and not the GET parameters.
WMI Security Center Sensor now triggers a change notification when the status code of the antivirus software changes.
Cisco CBQoS sensor works more robustly
Amazon CloudWatch sensor (ELB) now retrieves the correct value for maximum with (Un)HealthyHost (was the sum value before)
Syslog Receiver displayed UTF-8 encoded messages incorrectly.

Bugfixes [WebGUI]:

Fixed “selection tree” and “breadcrumbs” behavior for read-only users (the “Find Duplicates” and “Compare Sensors” functions did not work properly; clicks on specific breadcrumbs caused an error)
“Down Acknowledged” sensor list could not be opened via the status icon in maps
“Desktop Notifications” work again with Google Chrome browser and now Firefox is also supported.

Bugfix [Cluster]: Sensor names on cluster probes were shown incorrectly when collapsed
Many other bugfixes and improvements in the Enterprise Console and in all parts of PRTG, as well as an updated user manual.

June 13th 2014 - Version 14.2.11.2271/2272 [Preview]

New [Sensors]:

IPMI sensor: monitors temperature, fans, voltage via Intelligent Platform Management Interface (IPMI)
SNMP Printer sensor: can monitor the status (based on rfc1759) of various printers

New [WebGUI/Server]:

The new Dependencies Graph visualizes the dependencies between monitoring objects
Overview tabs of devices and groups now show the time of last auto-discovery
Channel settings dialog has now three options to ease editing multiple sensor channels: "Apply", "Save", and "Close"
The new History tab for libraries, maps, reports, notifications, schedules, user accounts, user groups, and settings shows all recent edits, creations, deletions, etc. of related child objects
New API call shows all sensor types which are currently used: /api/sensortypesinuse.json

Improved [Security]:

OpenSSL Upgrade to Version 1.0.1h (https://www.openssl.org/news/secadv_20140605.txt)
New PRTG default certificate (with RSA 2048bits)
When using administrative pages in the webGUI, PRTG now requires that the last credential based login was less than 15 minutes ago. If more time since the last login has passed the user must re-authenticate before being able to continue. This secures the webGUI against potential phishing attacks.
Browser form auto-complete for login name and password on the login page can now be disabled via a registry key option as security enhancement: https://kb.paessler.com/en/topic/60614
Registry key option to deny loading of PRTG web pages in frame elements (use with Caution: denies also loading of maps!). This helps protect against potential clickjacking attacks: https://kb.paessler.com/en/topic/60623
Some minor security improvements

Improved [WebGUI]:

Contact support form now shows helpful resources to help you find quick solutions to your issues
Search box size increases by mouse hover and focus
A big red alarm box will now appear if a PRTG health sensor is down (and not acknowledged) to focus your attention on serious problems in your installation
Sensor graphs on group and device overview tabs are now bigger and more graphs are shown than before to provide you a better overview on your monitoring data
HTTP notifications now work with and without SSL (also with servers which do not use SSLv3)

Improved [Sensors]:

SCVMM sensors now with corresponding error message if VM/host does not exist on the target system
Windows Scheduled Task sensor can ignore specific status codes
SNMP NetApp Enclosure sensor with better error handling
Syslog and SNMP Trap Receiver sensors show a corresponding error message if the probe is not connected
Adding filters on the Messages tab for Syslog/Trap Receiver sensors by clicking on the content of a column
SNMP NetApp Logical Unit sensor with more comprehensible columns when adding the sensor
Performance Counter sensors with a more comprehensible error message if the request contains duplicate channel names
WMI Process sensor now supports hybrid mode (32bit and 64bit Windows versions) and divides CPU load through the number of cores; furthermore, it does not count the "PRTG Server Administrator" in PerfCounter mode anymore if only "PRTG Server" is monitored
SNMP NetApp Logical Unit sensor now with optional alignment monitoring (an additional channel will be added by demand when creating the sensor)
HTTP Push Data sensor now shows an expressive error message if the port could not be opened

Bugfixes [Sensors]:

SNMP Dell System Health sensor returns a correct OK status, corrected lookup states assignments
Improved Error handling in Amazon CloudWatch sensor
Hyper-V sensors: Virtual machines without a virtual IDE controller do not cause access violations anymore
Hyper-V Virtual Machine sensor shows the correct error message if the VM is off and the sensor uses only Performance Counters
HTTP Full Web Page sensor did not write screenshots
Limit fields in sensor / channel settings did not accept float values
Windows Scheduled Task sensor did not create a primary channel

Bugfixes [WebGUI]:

Approve button for new probes did not work
Page refresh did not update everything
Keyboard enter did not work to confirm a dialog
SNMP Memory sensors were not shown in the top 10 memory sensors map object
Remote probe installation via Device Tools did not work
No more validation for correct entered email address in webGUI and admin tools
"Sensors with status" filter did not work correctly
Search function is now more robust in big installations
Top 10 lists didn't handle the filter status correctly
Read-only users cannot see context menu quick buttons anymore
DNS name is fully considered now when generating email and QR code links
Many other minor fixes

Bugfixes [EC]:

Lists could not be turned over to the end
Moving groups in the device tree was not exactly enough
Many other fixes and improvements

Many other improvements and fixes in all parts of the software as well as an updated user manual

May 15th 2014 - Version 14.2.10.2027/2028 [Preview]

Improved [Tickets]: Tickets regarding probe connection port errors with enhanced description

Bugfix [WebGUI]: Sunburst did not take full space when there were less than 2000 sensors

Bugfixes [Sensors]:

HTTP XML/REST Value sensor sometimes returned an error instead of returning the requested value although the JSON code was valid
SSH SAN Logical Disk sensor showed the error "Wrong Data Format" in specific cases
Exchange PowerShell sensors produced an error entry in the eventlog of Exchange servers at each scan for public folder databases
SNMP Cisco System Health sensor now returns an error status for the "not functioning" value

Bugfixes [EC]:

Cloning sensors did not work in some cases
Resume monitoring after simulating an error was sometimes not possible
Drag&drop changed sensor order in specific cases
Editing notifications from device context menu did not work in some cases

Several other minor bugfixes and improvements, as well as an updated user manual

March 26th 2014 - Version 14.1.10.1648/1649 [Preview]

Changed [Tickets]: New ToDo tickets are now assigned to the "PRTG System Administrator" user and notifications for these tickets are sent to this user only. This corresponds to the behavior of the former "ToDos". Right after the introduction of the ticket system, new ToDo tickets were assigned (and notified) to the entire "PRTG Administrators" user group. We reverted this due to user feedback.

Changed [Notifications]: The POST data part of HTTP notifications now supports line breaks. If you have configured such notifications, please check them for functionality.

New [Sensors]:

HTTP Push Data (Advanced) BETA sensor
Jacarta Interseptor Pro Environment sensor
UCS Physical Disk sensor

Improved [Sensors]:

SNMP Dell PowerEdge System Health sensor enhanced with multi-chassis support and better performance
HTTP Full Web Page sensor with http basic and NTM authentication
Stability improvements for Windows sensors using the Performance Counter method
SNMP Dell System Health sensor supports iDRAC
Better error handling of NetApp sensors and stability improvements
Flow sensors: The default filter rules are now editable
SNMP Cisco ASA VPN Traffic sensor enhanced with total traffic (sum) channel
SSH SAN sensors with better error handling and stability
Stability improvements for HTTP Push sensors
New WSUS Statistics sensors could not be created
Added a debug option to Traceroute Hop Count sensor
Added an SSLv3 option to HTTP SSL Certificate Expiry and HTTP XML/REST Value sensors
Easier setup for Active Directory Replication Errors sensor

Bugfixes [Sensors]:

Better connection handling for Enterprise Virtual Array (EVA) sensor
HTTP sensors now work with IPv6 and "smart URL replacement"
Better error handling of SNMP sensors
The total channel of some disk free sensors was missing
Fix for HTTP XML/REST sensor for JSON data containing links and other html code
Increased timeout for SSH sensors

Bugfix [Reports]: Scheduled reports were re-sent on PRTG restart

New [WebGUI]:

Notifications and schedules now have a history tab
Social Media and Feedback links can be disabled via a registry key option
Add sensor dialog alphabetically organized with most used sensor types on top and registry option for the shown sensor count
New filter options for the sensors list

Bugfixes [WebGUI]:

Large ad hoc "Historic Data" reports could trigger PRTG's overload protection in some cases
QR code scanning of user account did not work
Dozens of tweaks, improvements, and fixes for the Ajax Web Interface

New [EC]: Notification triggers can now be set for libraries

Bugfixes [EC]:

Fixed a memory problem in the Enterprise Console which could crash it when left open without interaction for a while.
Fixed bug with SSH SAN Physical Disc sensors' graphs
Start date of maintenance window wasn't applied
Graph display with CBQoS sensors works again
Fixed reports which have shown an empty window
Last viewpoint wasn't recovered when starting EC from tray
"Start with Windows" was inactive after updates
Several other fixes

Improved [Notifications]: New placeholders for syslog and trap notifications show the last 20 entries before a notification was triggered: %syslogwarnings, %syslogerrors, %trapwarnings, %traperrors
New [API]: New API call for lists of toplists: api/table.xml?content=toplists&columns=objid,sensor,name
New [Maps]: Added a new map object to replace the use of iFrames

Improved/Bugfix [Core]:

Stability improvements for the ticket database
SSL connections: In some cases, parts of a PRTG page could not be loaded due to single assets failing to load

Improved [Cluster]: Stability improvements, including stability for sensors with different sensor channels among the cluster
Improved [Remote Probes]: Stability improvements for the case that a remote probe is connected to the core server via an unsteadily connection
Improved [Translations]: Updated Czech language version
Updated user manual
Hundreds of other improvements and bugfixes

March 11th 2014 - Version 14.1.9.1440/1442 [Preview]

Improved [Sensors]:

Optimized storage for Syslog and SNMP Trap Receiver sensors
Better error handling for HTTP Push Data sensor
HTTP Full Web Page sensor with Chromium engine now supports page redirects
The subject of the emails sent by our Email Round Trip sensors may now contain arrow brackets <>

Bugfix [WebGUI]: Some device tools (from the context menu) did not work
Many other fixes to the Ajax Web Interface, the Enterprise Console, and other parts of PRTG

February 18th 2014 - Version 14.1.9.1374/1375 [Preview]

Bugfix [Core]: Fixed a critical security issue - see our blog post for details
Improved [WebGUI]: Better navigation on Toplist pages
Improved [Sensors]: Syslog and SNMP Trap Receiver sensors now have an advanced filter dialog to enter custom filters
Changed [Core]: Passwords may now have more than 3 identical characters
Bugfix [Sensors]:
- IBM System Health Sensor with fixed fan limits
- VMware sensors showed an error during backup operations
- HTTP Push Data sensor now uses a dot (.) as decimal seperator
- Non-admin users could not view messages for Syslog and SNMP Trap Receiver sensors
Bugfix [Core]: Stability improvements for installations with Hebrew language strings
Bugfix [WebGUI]: Several minor fixes
Bugfix [Tickets]: Special characters are now handled correctly
Improvements and fixes to the core, the WebGUI, the ticket system, the Enterprise Console, and the German language version

January 28th 2014 - Version 14.1.9.1192/1193 [Preview]

Improved [WebGUI]: Several improvements to the new tickets feature as well as dozens of other improvements and fixes
Improved [EC]: Several improvements and fixes for the Enterprise Console
Improved [Languages]: Updated German and French language version
Bugfix [Core]: Stability improvements for heavy use of toplists
Bugfix [Sensors]: Windows Update Sensor now with better error handling for clients with empty update lists
Several other improvements and fixes

January 17th 2014 - Version 14.1.9.1084/1085 [Preview]

New [Sensors]: 4 new sensor types
- [New] HTTP Push Data BETA sensor provides a URL (webhook) that can be used to push messages to the PRTG server using HTTP
- [New] SSH SAN Logical Disk sensor monitors a logical disk on SANs that support CLI over SSH
- [New] SSH SAN Physical Disk sensor monitors a physical disk on SANs that support CLI over SSH
- [New] SSH SAN System Health sensor monitors system health on SANs that support CLI over SSH
New [WebGUI]:
- The "Add sensor" dialog now automatically shows the most used sensor types first (this is calculated for each user)
- The sensors page can now be filtered for objects and tags with an inline filter directly above the table
- Added a filter option on similar sensors overview page
- Extended filter for search in tickets
- Toplists now show range lookups
- Added a hidden feature that allows showing geo tracking information provided by an Android probe on a geo map (instead of longitude and latitude in tables only). For details, please see our knowledge base article
Improved [Sensors]:
- Added new option to HTTP XML/REST Value sensor to define a decimal separator
- File Content sensor can now also handle text files containing Unix-Linefeeds
- Many improvements and fixes for the Syslog and SNMP Trap Receiver sensors
Improved [API]:
- Historic data XML can now return the channel ID
- Devicetree now contains lookup values
Changed [WebGUI]: Several webserver and IP settings can now be changed in the "System & Website" settings (was in the PRTG Server Administrator tool before)
Changed [Reports]: When generating top 10 or top 100 reports, all pages of one report are now written into one PDF file (could be several files before)
Changed [Auto-Discovery]: Optimized the detection of devices with multiple IP addresses (in order to avoid multiple monitoring of these devices)
Changed [Sensors]: The following sensors now require .NET 4.0 installed on the probe machine (was .NET 2.0 before)
- HTTP XML/REST Value
- HTTP SSL Certificate Expiry
- Windows Scheduled Task
Changed [Core]: General internal system backup tasks of PRTG are now performed at 3 a.m. local time (was 3 a.m. UTC before)
Bugfixes [Sensors]:
- VMware sensors didn't show datastore latencies in some cases
- IMAP sensor now has better support for multipart emails
- Fixed a bug in NetFlow sensors that could cause regular probe restarts
- SNMP sensors with extended error code handling
- Added "total" channel to the following sensors: SNMP Linux Disk Free, SSH Disk Free, and SSH ESX Disk Free
- Hyper-V Virtual Machine sensor now supports Windows Server 2012 R2
- SNMP Hardware Status sensor with extended error handling
- SNMP IBM System Health Temperature sensor now with extended error handling
- HTTP SSL Certificate Expiry sensor now works with SNI and SSLv3
Bugfix [Core]: Optimized remote probe updates on very slow connections
Bugfix [Cluster]: In some cases sensor channels were not synchronized correctly on all cluster nodes
Bugfix [WebGUI]:
- Geomaps can be zoomed again using the mouse wheel
- The sensor status filter for the device tree now survives a browser refresh
Many improvements and fixes to the Enterprise Console
Hundreds of other improvements and fixes in all parts of the software as well as an updated user manual

December 23th 2013 - Version 13.4.8.3741/3742 [Preview]

Improved [WebUI]: Many updates and improvements for the Ajax Web GUI, including some Internet Explorer tweaks
Improved [Manual]: Updated user manual
Bugfix [Sensors]: Warning/Error Channel of Trap Sensors
Several other improvements and bugfixes

December 13th 2013 - Version 13.4.8.3698/3699 [Preview]

New [MiniProbe]: This PRTG version is compatible with the new Android probe. For details, please see our blog article
Improved [Tickets]: Many improvements and fixes for the new tickets system; in the Ajax Web GUI as well as in the Enterprise Console
Improved [Sensors]: Many improvements and fixes for the new Syslog sensor filter system
Improved [MobileGUI]: Tickets can now be viewed and opened in the mobile web interface
Bugfix [Core]: Stability improvements for setups using Oracle SQL sensors
Bugfix [Sensors]:
- VMware (SOAP) sensors did not work with certain characters in credentials
- Exchange sensors handled float values incorrectly
Bugfix [WebGUI]:
- Internet Explorer 9 showed wrong sensor colors on auto-refresh
- Many other improvements and fixes
Bugfix [Maps]: Fixed rights management for object selector, plus other improvements
Bugfix [Toplists]: Fixed a problem that could cause grey toplist graphs
Bugfix [EC]: "Switch to this version" did not work in all cases, plus other improvements and fixes
Bugfix [Cluster]: Stability improvements for cluster installations that use a mixed setup of nodes with both 32 bit and 64 bit Windows versions (we strongly recommend to use one bit version only)

December 3rd 2013 - Version 13.4.8.3621/3622 [Preview]

New [WebGUI]: Completely revised and updated look&feel of the PRTG Ajax Web GUI

New [Tickets]: PRTG now includes its own ticket system. With the ticket system you can manage and maintain various issues which may appear while monitoring your network with PRTG. Note: The new ticket system replaces the existing 'ToDos' functionality. When PRTG needs to tell the admin something important, it will now create a new 'ToDo Ticket'; this will now be sent to the PRTG System Administrators user groups.

New [ToDos]: The "ToDo" feature has been replaced by the tickets feature. Existing todos are converted into tickets as soon as you update to this version. See above.

New [Sensors]: Completely rewritten Syslog Receiver and SNMP Trap Receiver sensors designed for high performance. For details, please see our blog article.

New [Sensors]: 8 new sensor types:
- SNMP Windows Service sensor monitors a service via SNMP
- SNMP Cisco UCS Chassis sensor monitors the health status of the chassis of a Cisco "Unified Computing and Server" device
- SNMP Cisco UCS System Health sensor monitors the system health of a Cisco "Unified Computing and Server" device
- SNMP LenovoEMC Physical Disk sensor monitors a physical disk in LenovoEMC NAS
- SNMP LenovoEMC System Health sensor monitors the System Health of a LenovoEMC NAS
- SNMP NetApp Logical Unit sensor monitors the I/O on a logical unit of a NetApp storage system
- WMI Volume Fragmentation sensor monitors the fragmentation of a logical volume
- HTTP Push Count sensor provides a URL (webhook) that can be used to push messages to the server using http. The sensor will count the pushed messages and display the count of received messages with every scan.
Improved [Sensors]: SNMP IBM System X System Health sensor enhanced with an additional instance for "Overall Health" on Integrated Management Modules (IMMs)
Improved [WebGUI]: Safari 7+ and Opera 12+ can now log into the Ajax WebGUI (please note that both browsers are still not officially supported)
Improved [Language]: Updated Czech language version
Feature [EC]: Added "One-time maintenance window" and "Add Device Tool..." to context menu
Bugfix [Sensors]: Improvements to QNAP NAS Smart status lookup
Bugfix [Sensors]: Some packet sniffer filter fields did not work
Bugfix [Sensors]: Better user interface when creating Amazon SNS sensors
Bugfix [Sensors]: SSH Script Advanced did not show any values in historic data when using "Include Percentiles"
Bugfix [EC]: Stability improvements for configurations with multiple PRTG core servers as well as many other improvements and bugfixes
Bugfix [WebGUI]: Multiple improvements and bugfixes throughout the entire Ajax web interface, including channel editing, IE 11 compatibility, top 10 lists, and the Maps feature.
Bugfix [Notifications]: Notifications that are set for Library groups were not applied to sensors
Bugfix [Reports]: Fixed a bug that appeared in reports when sensor names included quotes
Various other bugfixes and improvements to the WebGUI, the sensors, the Enterprise Console, and the user manual.

October 24th 2013 - Version 13.4.7.3348/3349 [Preview]

Improved [Maps]: Faster loading of maps, plus stability improvements when viewing public maps for extended time periods (for Internet Explorer 9, Firefox, Chrome)
Bugfix [Maps]: In current Chrome browser public maps (that are shown, e.g., permanently on a dashboard) had to be reloaded manually once after a PRTG core server restart. Now they again keep refreshing until the server is reachable again.
Bugfix [Core]: Stability improvements
Bugfix [Sensors]:
- FTPS Sensor ignored port setting
- Windows Update Sensor did not get data in some cases
Bugfix [EC]: Enterprise Console
- did not always show graphs for sensors flagged "favorite"
- hang on sensor double click
Bugfix [Mobile Web GUI]: Interface did not show loading symbol during data transfer
Bugfix [WebGUI]: Ajax Web GUI now accepts Internet Explorer 11
Several other fixes to the Ajax Web GUI and the Enterprise Console as well as an updated user manual

October 11th 2013 - Version 13.4.7.3256/3257 [Preview]

Improved [Sensors]: WMI Security Center sensor now supports Symantec Endpoint Protection
Bugfix [Sensors]:
- SSH sensors caused hanging virtual terminals on several target systems
- Fixed some minor bugs for VMware sensors
- Fixed a bug that occured when creating a new SNMP Linux Physical Disk sensor
- Windows Updates Status (Powershell) sensor showed incorrect time since last update
Bugfix [WebGUI]: The "Setup" page did not show the "Contact Support" option for non-cluster installations
More stability improvements for the core system and the Maps feature
Minor fixes to the web interface
Updated user manual

September 18th 2013 - Version 13.3.7.3113/3114 [Preview]

Updated user manual
Minor bugfixes

September 16th 2013 - Version 13.3.7.3077/3078 [Preview]

Bugfix [WebGUI]: Sensor gauges were not displayed anymore
Bugfix [WebGUI]: Fixed an XSS vulnerability

September 13th 2013 - Version 13.3.7.3065/3066 [Preview]

New [Sensors]: 2 new sensor types for the NetFlow 9 successor protocol:
- IPFIX sensor monitors standard parameters of IPFIX streams
- IPFIX (Custom) sensor allows user defined monitoring of IPFIX streams
New [WebGUI]: Sensors showing lookup values now have a graphical representation in the known "gauges" style
New [WebGUI]: New function to find duplicate devices (i.e. devices with the same IP address) in your PRTG configuration: Right-click a device and select "Find Duplicates..."
New [Core]: Similar sensor analysis can now the toggled on/off on a group basis (in the settings of a group in the device tree)
New [EC]: You can now send a "support bundle" to our technical support team direcly for the Enterprise Console
Improved [Sensors]:
- Massive performance improvements for all VMware (SOAP) sensors
- For HTTP sensors you can now define a custom "content type" when using the "POST" request method
- HTTP Advanced and HTTP Transaction sensors now have a "Compatibilty Mode" for websites that do not work with the standard method
- HTTP Full Web Page Sensor with updated Chromium (webkit) and PhantomJS engines
- Easier creation of instances of the "Enterprise Virtual Array (EVA)" sensor
- Better QNAP System Health sensor
- Better compatibility of SSH Script (Advanced) sensor with Solaris systems
- Better compatibility: SNMP Uptime sensor now uses updated OID
- EXE/Script sensors now support IPv6
Improved [Notifications]: You can now use %host as Agent IP in SNMP Trap notifications sent by PRTG
Improved [WebGUI]: When sending a "support bundle" to our technical support team you can now include a screenshot of the current page
Bugfixes [Sensors]:
- Fixed Windows Last Update sensor for queries to localhost
- Fixed Sensor Factory sensor
- Fixed channel limits for IBM System Health sensor
- Fixed Oracle SQL sensor (host string in Oracle Client mode did not work)
Many improvements to the core, Maps, Enterprise Console, WebGUI as well as an updated user manual.

August 28th 2013 - Version 13.3.6.2899/2900 [Preview]

New [WebGUI]: "Send Feedback" is now "Contact Support" including all features from the Support Bundle
Bugfix [WebGUI]: fixed Cluster selector in graph views
Bugfix [WebGUI]: fixed Toplist sorting by source/destination
Bugfix [WebGUI]: fixed collapsed Sensor Groups on devices to link to the Device Overview
Many minor Bugfixes

August 9th 2013 - Version 13.3.6.2767/2768 [Preview]

New [Sensors]: New sensor type Windows Updates Status (Powershell) (displays information about installed updates on a Windows machine)
New [Sensors]: New sensor type HP EVA (Enterprise Virtual Array san), requires “Command View Enterprise Virtual Array” software from HP to be installed on the probe system, sssu.exe must be version 10.0 or later, see https://kb.paessler.com/knowledgebase/en/topic/55983
New [Sensors]: New sensor type SNMP SonicWALL VPN Traffic
New [WebGUI]: Support-Bundle with browser-screenshot allows the user to send a screenshot of the current page and optional analysis data of the PRTG installation to Paessler support for analysis (PRTG mail server must be able to deliver emails to Paessler)
Improved [Maps]: Selected object can be moved using the cursor keys (10 px with and 1 px without shift key) in the map editor
Improved [WebGUI]: Geo maps using Google Static Maps now use https (avoids browser security warning)
Improved [Core]: Optimized purging of old monitoring data (uses fewer cpu cycles)
Changed [WebGUI]: Design facelift of the web GUI
Changed [Sensors]: SSH based sensors can now run commands with elevated rights using sudo
Improved [Sensors]: Custom EXE/Script Advanced sensor - added option to write results to disk on error/down only
Improved [Sensors]: Improved performance of SNMP V3 sensors, especially when several credentials were used across several devices
More than 300 bugfixes

July 23rd 2013 - Version 13.3.5.2610/2611 [Preview]

Bugfix: Fixed a memory leak in the browser device tree display
Bugfix: More than 40 bugfixes since 13.2.5.2522

July 14th 2013 - Version 13.3.5.2522/2523 [Preview]

New [Notifications]: Add an extended notification logging feature that helps analyzing notification delivery problems (optional, see How can I enable Notification Delivery Logging? in the knowledgebase)
New [WebGUI]: Added new dependency list feature to the "Devices" menu of the WebGUI
Bugfix: More than 50 bugfixes since 13.2.5.2436
Updated manual

July 2nd 2013 - Version 13.3.5.2436/2437 [Preview]

New [WebGUI]: Multi-Edit for Channels
Bugfix: More than 80 bugfixes since 13.2.5.2337, mainly in the UI

June 21st 2013 - Version 13.2.5.2337/2338 [Preview]

New [Sensors]: 5 new sensor types for detailed Exchange monitoring, all based on Powershell
- [New] Exchange Database (Powershell)
- [New] Exchange Backup (Powershell)
- [New] Exchange Mailbox (Powershell)
- [New] Exchange Public Folder (Powershell)
- [New] Exchange Mail Queue (Powershell)
New [Sensors]: 6 new sensor types for monitoring devices via SNMP
- [New] SNMP GSA System Health Sensor
  monitors the system health of a Google Search Appliance
- [New] SNMP SonicWALL System Health Sensor
  monitors health values of a Dell Sonic Firewall
- [New] SNMP Cisco CBQoS Sensor
  monitors quality-of-service via compatible devices and supports the following three classes: Class Map, Match Statement, Queueing
- [New] SNMP Poseidon Environment Sensor
- [New] SNMP Hardware Status Sensor
  monitors compatible hardware via standard OIDs
- [New] SNMP Linux Physical Disk Sensor
  monitors IO on disks of a Linux/Unix system
New [Core]: New "Value Mode" available for sensor channels that return absolute values. They can not only show averages, but also minimum or maximum values in the graphs for the respective time spans. For details, please see this knowledge base article.
New [WebGUI]: The „Pause" context menu of all objects now has an option to directly add a one-time maintenance window to pause monitoring during a planned downtime
Improved [Remote Probes]: For more flexibility when using NAT at a remote location, remote probes can now be denied via their global identifier (GID). When deinstalling a remote probe, it will now be automatically added to the "Deny GIDs" list (instead of the "Deny IPs" list).
Improved [Probe]: Better stability for probe connections
Improved [Probe]: Better handling for WMI connections and values reported via WMI
Improved [Sensors]:
- Dell PowerVault MDi Sensor now also works with models 3000f, 3620f, and 3620i. It may work with additional models, too.
- SNMP QNAP System Health Sensor with better data detection and improved stability
- SNMP Custom String Sensor now has a setting for a sensor status "Warning" when certain keywords are matched
- SCVMM sensors now also work if no IIS is installed on the target system, they now support Windows 2012, and other improvements
- Amazon CloudWatch Sensor with new region filter and a fix for ELB
- SNMP Cisco System Health Sensor now shows additional data
- Flow and packet sniffer sensors now support „DSCP" in sensor settings
- Oracle SQL sensor now supports OCI (Oracle Client)
- Better performance and compatibility for several SNMP sensors, incl. Linux SNMP (Debian 7)
Improved [EC]: Many improvements, new features, better stability, and other fixes for the Enterprise Console
Improved [Core]: Better stability and performance, also for cluster installations
Improved [Security]: Updated SSL libraries for sensors using https, the PRTG web server, probe-core-connections, SNMP v3, etc., plus other security improvements for the web server
Bugfix [Sensors]: Windows CPU Load Sensor could show wrong values when querying data via direct Performance Counters
Bugfix [Sensors]: Several fixes for the Hyper-V Cluster Shared Volume Disk Free Sensor
Bugfix [Sensors]: More stability for SSH sensors with private key
Bugfix [Sensors]: Apache ModStatus sensors used a wrong path for auto-completion
Bugfix [Sensors]: SQL sensors now can monitor „Record Count" independently from
„Post Processing"
Bugfix [Sensors]: SSH sensors now with better compatibility as well as improved performance and network-load
Bugfix [Sensors]: Hyper-V Virtual Machine Sensor did not observe the "Ignore powered off state" setting
Bugfix [Reports]: Fixed wrong downtime averages in reports
Bugfix [Setup]: Vulnerability fix
Bugfix [WebGUI]: Several improvements and fixes, incl. sunburst view, graph legends, slightly redesigned sensor "Overview" tab
Bugfix [Core]: PRTG sensor count limits were not inherited to sub groups
Bugfix [Core]: Graphs with limits were not displayed correctly in some scenarios
Many other improvements and fixes to the core system as well as an updated user manual

June 14th 2013 - Version 13.2.4.2288/2289 [Preview]

New [Core]: New registry key option to centrally disable automatic numbering in PRTG (for example, automatic numbers attached to sensor names when using the auto-discovery). For details, please see our knowledge base article.
Improved [Sensors]: Enhanced compatibility for HTTP XML/REST Value Sensor
Improved [Sensors]: Windows Print Queue Sensor now supports print queues with no physical printer attached
Improved [WebGUI]: Optimized speed for device trees with many _collapsed_ groups that show red sensors
Improved [Language]: New Japanese language file
Bugfix [Notifications]: We corrected the behavior of the SMTP SSL/TLS encryption for outgoing email notifications when using an SMTP relay server. Note: If you experience problems with outgoing email notifications after this update, please check and revise your SMTP delivery settings under "Setup | System Administration | Notification Delivery". Pay special attention to the "Use encrypted connection" setting.
Bugfix [Sensors]: PRTG did not accept lookup files containing ranges or bitfields. Details about lookups: https://www.paessler.com/manuals/prtg/define_lookups.htm
Bugfix [WebGUI]: In some cases, graphs with similar sensors were shown to users that did not have the right to see them.
Bugfix [WebGUI]: Sensor gauges now show all limits for disk sensors.
Bugfix [WebGUI]: Read-only users with respective rights could not acknowledge alarms using the Mobile Web Interface.
Plus several improvements, styling and fixes to the Ajax web interface and the Maps functions as well as an updated user manual.

June 7th 2013 - Version 13.2.4.2233/2234 [Preview]

Feature [WebGUI]: Added a hidden feature to bulk-print QR codes (try /devices-qr.htm?id=0). For details, please see our knowledge base article.
Improved [Translations]: New Chinese language version
Improved [Sensors]: WMI Exchange sensor now shows Active User Count, User Count, Connection Count, Current Unique Users, and Average Response Time (Please note: For existing sensors, the former sensor channel "Active User Count" will show zero values now)
Bugfix [Sensors]: SNMP Cisco System Health sensor showed an "unknown" status in some scenarios
Bugfix [Sensors]: Fixed Cisco IP SLA calculation
Bugfix [WebGUI]: In sensor gauges limits were not always shown correctly
Bugfix [WebGUI]: Holding down Ctrl key + mouse click in browser now also works on MacOS systems
Plus several little improvements and better stability for the web interface and the Enterprise Console as well as an updated user manual.

May 7th 2013 - Version 13.2.4.2033/2034 [Preview]

Bugfix [Maps]: Several improvements
Bugfix [Sensors]: IMAP sensor did not return correct date for last incoming data in some scenarios
Bugfix [WebGUI]: Fixed sunburst view
Bugfix [WebGUI]: Improved compatibility with Internet Explorer 10 (SNMP Traffic sensors could not be created manually)
Bugfix [WebGUI]: Sensor graphs showing channel limits were not displayed correctly
Bugfix [Maps]: Several improvements to PRTG Maps, including quicker updates of public maps
Bugfix [Sensors]: Removed hardcoded default server for IP on DNS Blacklist sensor (dnsbl.njabl.org)
Bugfix [Notifications]: PRTG did not send email notifications via Gmail
Improved [Maps]: In "Maps Designer" you can now search for objects in the device tree by entering keywords
Bugfixes [WebGUI]:
- Fixes for behavior of sensor "gauges"
- Several fixes to PRTG Maps behavior and public Maps view
- Improved Libraries
- XSS security fix
Bugfixes [EC]: Several fixes to the Enterprise Console
Bugfix [Notifications]: PRTG could not send SMS text messages using provider "smsdriver". Note: Please use "Maximum Length of Text" = 0 when setting up this provider in the "Notification Delivery" settings
Bugfix [Sensors]: Windows Logged In Users Sensor reported an error when measuring more than 85 logged in users
Bugfix [Sensors]: Dell PowerVault MDi sensor showed speed values with a wrong factor
Several other improvements and minor fixes

April 26th 2013 - Version 13.2.4.1946/1947 [Preview]

Improved [Core]: Overall speed and performance of the PRTG web interface and the Enterprise Console by significantly improved handling of user sessions. You will especially experience increased speed if many users access your core server at the same time.

New [Sensors]: The „Application Performance BETA Sensor" is an experimental sensor that measures the performance of many different web applications. In order to obtain valuable data, such applications must work TCP-based and initiate a new session with each request. Please give us feedback for this sensor type!

New [Sensors]: Three new sensor types for monitoring QNAP storage systems
- [New] SNMP QNAP Physical Disk Sensor
- [New] SNMP QNAP Logical Disk Sensor
- [New] SNMP QNAP System Health Sensor
New [Sensors]: Three new sensor types for monitoring Synology storage systems
- [New] SNMP Synology Physical Disk Sensor
- [New] SNMP Synology Logical Disk Sensor
- [New] SNMP Synology System Health Sensor
New [Sensors]: Three new sensor types for monitoring IBM System X systems
- [New] SNMP IBM System X Physical Disk Sensor
- [New] SNMP IBM System X Logical Disk Sensor
- [New] SNMP IBM System X Physical Memory Sensor
Improved [Core]: General improvements to the SNMP monitoring engine
Improved [Sensors]: All http sensors now support Server Name Identification (SNI)

Improved [Sensors]: The HTTP Content sensor now supports NTLM authentication
Improved [Sensors]: The Port Sensor now also supports response _text_ as a result
Improved [Sensors]: Both HTTP Apache ModStatus Sensors now support monitoring of protected ModConf pages.
Improved [Sensors]: Hyper-V Cluster Shared Volume Disk Free Sensor can now query data from localhost
Improved [Sensors]: Updated WSUS Statistics Sensor
Improved [Autodiscovery]: PRTG now gives precedence to creating SNMP sensors for monitoring CPU, memory, disks. Only if SNMP is not available on the target device, PRTG will create Windows/WMI sensors. Note: If you have a _scheduled_ auto-discovery which runs regularly, PRTG will create some double sensors (SNMP and WMI). Only existing configurations are affected by this issue.
Improved [Core]: Enhanced security with better protection against external connection attempts.
Improved [EC]: New menu icons as well as many improvements and bugfixes for the Enterprise Console.
Improved [Core]: After a core server restart PRTG now waits longer for an IP address to be assigned to the server. This will solve issues with PRTG's web server switching to localhost after restarts.
Improved [API]: Graphs can now also be queried in SVG format via the API
Bugfix [Notifications]: Email subjects containing "=?" were not transmitted correctly
Bugfix [Sensors]: Oidlib files containing lookups produced an error on sensor creation
Bugfix [Sensors]: Corrected % calculation for Windows Pagefile Sensor
Bugfix [Sensors]: In some cases the SMTP&IMAP Round Trip Sensor and the SMTP&POP3 Round Trip Sensor did not work correctly when using special email subjects
Bugfix [Sensors]: The HTTP Transaction Sensor did not accept cookies in some scenarios
Bugfix [Sensors]: Better stability for the WMI UTC Time Sensor
Bugfix [Sensors]: Better compatibility and stability for SNMP HP ProLiant Disk sensors
Bugfix [Sensors]: Removed a possible memory leak in ADO SQL Sensor
Social media integration: Follow us on Facebook, Twitter, and Google+ directly from PRTG's welcome page
Optimization of the monitoring engine, better stability and speed, updated user manual, and many other improvements and fixes

April 5th 2013 - Version 13.2.3.1720/1721 [Preview]

Various other bugfixes and improvements
For all details, please see release notes of version 13.1.3.1474/1475 below

April 3rd 2013 - Version 13.2.3.1699/1700 [Preview]

Bugfix [Sensors]: An error could cause all sensors to show a grey "unknown" status
Various other bugfixes and improvements

March 22th 2013 - Version 13.1.3.1643/1644 [Preview]

Bugfixes and improvements

March 20th 2013 - Version 13.1.3.1611/1612 [Preview]

Improved [GUI]: Many improvements and fixes to the Ajax Web GUI, the PRTG Maps, and the Enterprise Console
Improved [Core]: Optimized similar sensors analysis
Bugfix [Sensors]: Fixed CPU index labels for SNMP CPU Load sensor (effective only when creating new sensors of this kind)
Many other improvements as well as an updated user manual
Known issue: Libraries currently do not support all available tree views

March 13th 2013 - Version 13.1.3.1542/1543 [Preview]

New [WebGUI]: Social network integration: Become a fan of PRTG directly from the web interface
Many bugfixes and improvements to the web interface, the PRTG Maps, the Enterprise Console, and the core system

March 5th 2013 - Version 13.1.3.1474/1475 [Preview]

This release contains the code of focused development work from the last five months. The most obvious change: We have revised the entire web interface. It now reacts almost instantly, and with new control elements and colors, data is now easier to consume. Plus, we added a lot of new features here and there to make PRTG even more convenient to work with. For detailed information, please see

Video—Our founder presenting the updated interface
Read about it—An article in our blog introducing the new interface in its historical context

Some of our users use custom CSS, HTML, or their own icons to change the look&feel of PRTG's web interface and/or reports. Please note that this kind of customizations will be disabled after an update to the current version and you will have to rework them. For details, please see https://www.paessler.com/knowledgebase/en/topic/44703

Please empty your browser cache if you experience display issues when loading the new web interface for the first time. Supported browsers are Chrome 14 or later (recommended), Firefox 10 or later, and Internet Explorer 9 or 10.

The changes in detail:

New [WebGUI]: Completely revised and updated look&feel of the PRTG Ajax Web GUI
- Faster loading times and almost instant reaction on clicks
- All settings loaded in layer popups so you never lose the context of your work
- New view modes for Libraries: Sunburst, Tree Map (as known from the device tree)
- Revised devices overview page: Extra display of high-priority sensors, in different sizes, for sensors with 4 and 5 star priority
- Revised sensors overview page: Graphical display of sensor channels with gauges. For xFlow and packet sniffer sensors, the "Toplist" graphs are now shown in the "Overview" tab. Edit channel settings directly on a sensor's "Overview" tab.
- Redesign of built-in dashboards, sitemap, and top 10 lists
- New sensor comparison page: compare several sensors at a time
- New default colors for graphs
- Changed appearance of buttons, tables, etc.
- New interactive breadcrumbs for an easier navigation
- QR codes for easy access to the direct URL of your monitoring objects on your mobile
- Many other tweaks here and there
- The Enterprise Console profits from the changes, too - whenever it embeds parts of the WebGUI
New [MobileGUI]: Revised Mobile Web GUI: Easier to read and new look&feel
New [Core]: Similar sensors analysis: PRTG automatically detects similar sensor data and shows matches in your sensor's "Overview" tab. This function is totally independent from sensor types and uses pure mathematics for heuristic calculation. (You can configure this feature in the "System & Website" system settings.)
New [Graphs]: Display of sensor limits: If you set a limit in a sensor channel (for example, an upper or lower warning limit, or an upper or lower error limit), these limits will be shown in the new sensor gauges as yellow and red areas. Additionally, yellow and red areas can be shown in graphs. In order to show the colored areas in graphs, you must configure your graph to show one sensor channel only. Otherwise the limit areas will be hidden in graphs. For details, please see our knowledge base at https://www.paessler.com/knowledgebase/en/topic/48463
New [Sensors]: We reworked the internal system for SNMP monitoring
- New: PRTG now supports SNMP v3 with AES encryption
- We extended the port identification options in the SNMP Compatibility options which allows for better adaptation to different behavior of your switches/routers in the case they reboot.
- More stability for SNMP monitoring
- Please see also our updated SNMP Tester (beta): https://www.paessler.com/tools/snmptester
New [Core]: Performance improvements for systems with 12 CPUs or more: PRTG now makes better use of CPU power which decreases your PRTG system's load
New [WebGUI]: The Ajax Web Interface now shows latest news from our company blog on the login screen and on the setup main page
New [EC]: The Enterprise Console now shows latest news from our company blog in a status bar at the bottom of the main window
New [Core]: Graphs can now be downloaded as SVG files
New [Core]: We changed the way dependencies between PRTG objects are shown
New [Core]: Faster search in the web interface
Improved [EC]: Many updates, changes, and fixes for the Enterprise Console
Improved [Autodiscovery]: Improved device templates for automatic network discovery.
New [Notifications]: When using a custom URL for SMS text message notifications, you can now define the encoding for SMS (in the "Notification Delivery" system settings), plus there will now be a result shown in PRTG's Logs list
Improved [Sensors]: The WMI Logical Disk sensor now shows more information
Improved [Sensors]: The Email Round Trip sensors now allow for a custom subject text addition and connect correctly when using SSL (TLS)
Improved [Sensors]: The WMI Service sensor can now show CPU load
Improved [Sensors]: The Port sensor now supports SSL-encrypted connections
Improved [Sensors]: Better error handling for the following sensor types: SNMP Cisco ADSL, SNMP Cisco ASA VPN Traffic, SNMP Cisco System Health, SNMP Dell Physical Disk Sensor, SNMP Memory, SNMP Disk Free, SNMP HP ProLiant Logical Disk, SNMP HP ProLiant Network Adapter, SNMP HP Proliant Memory Controller, as well as for all NetApp sensors and SNMP Library sensors
Improved [Reports]: When sending reports as PDF file(s) via email, you can now enable compression so the report files will reach you in ZIP format
Improved [Notifications]: We updated the design of the pre-configured templates for email notifications. Note: Please click on the "Reset to default" link in your email notifications settings to profit from the new templates.
Bugfix [Sensors]: Event Log (Windows API) Sensor could not filter by multiple IDs
Improved [Sensors]: Hyper-V Virtual Machine Sensor can now monitor machines running on Windows Server 2012, plus improved data calculation
Bugfix [Sensors]: Better performance for HTTP sensors when monitoring websites that redirect from http to https
Bugfix [Sensors]: Better error handling for HTTP Full Web Page sensor with Chromium engine
Bugfix [Sensors]: Fixed display issues in WMI Microsoft SQL server sensors settings
Updated user manual und API documentation, updated translations as well as hundreds of other improvements and fixes to all parts of PRTG

Changed/Removed:

Changed [Sensors]: There is no "Channels" tab any more in the WebGUI and in the Enterprise Console. Instead, you can edit sensor channels directly on a sensor's "Overview" tab, using the small gear icons next to the channel display. To make a sensor channel the primary channel, click on the little pin symbol.
Changed [Sensors]: There is no "Toplist" tab any more in the WebGUI and in the Enterprise Console for xFlow (NetFlow, jFlow, sFlow) and packet sniffer sensors. Instead, access Toplists directly by clicking on the Toplist graphs on a sensor's "Overview" tab.
Changed [Sensors]: For WMI Exchange Server sensors, we restricted the available measurements to a reasonable selection
Changed [Graphs]: The background color of graphs cannot be set any more in the "System & Website" system settings (background color will always be transparent).
Changed [Dashboards]: The former default "Dashboard 4" ("Home | Dashboard 4") was not compatible with the new interface, so we removed it.
Changed [API]: The API for customizations of PRTG's HTML, JavaScript, and CSS has changed. For details, please see https://www.paessler.com/knowledgebase/en/topic/44703
Changed [GeoMaps]: When entering a new "Location" for a probe, group, or device, PRTG now tries to resolve a street address to geo coordinates not only via Yahoo, but also via MapQuestAPI and Nokia. For details, please see https://www.paessler.com/knowledgebase/en/topic/35823

Known issues:

[WebGUI]: Please empty your browser cache if you experience display issues when loading the new web interface for the first time
[WebGUI]: The dependency display ("Devices | Dependencies") is currently not available. A similar view will return with future versions.
[UI]: The Czech and Chinese language versions are not updated. You may see a lot of strings in English language when running the web interface or the Enterprise Console in these languages.

February 18th 2013 - Version 13.1.1.1340/1341 [Preview]

Changed [Notifications]: The header of email messages (including the subject field) will now only be UTF-8 encoded if it contains non-ASCII characters. For content containing ASCII only the header will not be UTF-8 encoded any more. Note: PRTG will always UTF-8 encode the content (body) of all outgoing emails.
Improved [Sensors]: Added support for non-compliant OIDs for sensor types: SNMP Custom, SNMP Custom String, and SNMP Trap Receiver. New feature: In order to enter an OID into the "OID Value" field that does not begin with 1.0., 1.1., 1.2., or 1.3., add the string norfccheck: at the beginning of your OID.
Improved [Sensors]: Active Directory Replication Error sensor: Added option to monitor logged in domain controller only
Improved [Sensors]: HTTP XML/Rest Value sensor: New option for custom content type
Improved [Sensors]: Pingdom sensor
Bugfix [Sensors]: Windows Scheduled Task sensor: Task names with an (.exe) extention caused a "Value did not fall within the expected range" error
Bugfix [Sensors]: Windows Security Center sensor now supports Sophos and Norton antivirus products
Bugfix [Maps]: On large maps, scrollbars were missing in Maps designer mode
Numerous other improvements and fixes

February 11th 2013 - Version 13.1.1.1271/1272 [Preview]

Improvement [Sensors]: Hyper-V Cluster Shared Volume Disk Free Sensor now accepts umlauts in volume names
Bugfix [Notifications]: Emails from notifications with multiple attachments showed wrong filenames in attachments
Bugfix [Notifications]: Change triggers did not fire for some sensor types
Bugfix [Sensors]: SSH connections were not closed correctly in some cases
Bugfix [Sensors]: Removed PerfCounter Memory sensor
Bugfix [Sensors]: Fixed bug with negative values for PCmeasure (MessPC) devices
Plus several minor fixes and improvements

January 28th 2013 - Version 13.1.1.1160/1161 [Preview]

Bugfix [Core]: Sometimes notification emails got messed up by unfortunate encoding
Note: Email messages will now be entirely UTF-8 encoded, including the subject line. Unfortunately, this may cause some email-to-SMS gateways to send unreadable SMS text messages. In this case we recommend switching to another gateway service.
Various smaller bugfixes

January 15th 2013 - Version 13.1.1.1098/1099 [Preview]

New [Sensors]: Rewritten system for sensor channel lookups
Improved [Sensors]: HP ProLiant Physical Disk sensor
Improved [Sensors]: Improvements to the SIP Options Ping sensor.
Improved [Translations]: German, Japanese
Changed [Sensors]: The new Windows WMI/Performance Counters hybrid sensors are not shown as "beta" any more
Bugfix [Sensors]: SSH Script sensors could show a false error on HP Unix systems
Bugfix [Sensors]: Several fixes in SCVMM Sensors
Bugfix [Sensors]: The Cisco System Health sensor did not show voltage values
Bugfix [Autodiscovery]: The auto-discovery did never create a WMI S.M.A.R.T. sensor
Bugfix [Notifications]: Improved Clickatell SMS support
Bugfix [Core]: New geographical locations could not be resolved (the external geocoding API, which is used by PRTG, has changed)
Bugfix [Core]: Added compatibility for Windows Server Manager 2012; it does not show PRTG application warnings any more
Several other minor fixes and many improvements

November 22nd 2012 - Version 12.4.6.3384/3385 [Preview]

Changed [WebGUI]: Fixed Chrome Desktop Notifications (Chrome's API was changed)
Bugfix [WebGUI]: customerscript.js was overwritten during update installations
Bugfix [Sensors]: Smaller fixes for SCVMM sensor, HP Proliant sensors
Plus a few other fixes, improved texts and translations

November 13th 2012 - Version 12.4.6.3257/3258 [Preview]

New [Sensors]: Added several new sensors
- New sensors for HP Proliant servers, Dell servers and Cisco systems
- New sensors for Microsoft System Center Virtual Machine Manager
- sFTP Sensor, WMI SQL Server 2012, and SSH Script Avanced
- Migration of various WMI-only sensors to Hybrid Windows sensors (seamlessly use performance counters instead of WMI wherever possible to minimize the load on system resources and CPU)
New [Core]: Features to support MSP environments and automated multi user setups
New [API]: User Access Rights can now be set via API call
Improved [Core]: Updated translation for Spanish, French, Brazilian, Chinese
Bugfix [Sensors]: Improved NetApp Enclosure Sensor detection
Bugfix [Sensors]: NetApp System Health Sensor did not show data in some cases
Bugfix [Sensors]: Some WMI sensors did not show error messages
Improved [Sensors]: SNMP Disk Free sensor can now handle very big file systems
Numerous other changes, improvements, and bugfixes as well as improved translations

October 17th 2012 - Version 12.4.4.3137/3138 [Preview]

Improved: Startup code for Remote Probe installer and uninstaller
Improved: Updated French language translation
Change: We had to remove the following sensors from the Preview channel, their roll out must be delayed (If you still want to test them, please use the Canary channel instead.)
1. SNMP HP Proliant Physical Disk
2. SNMP HP Proliant System Health
3. SNMP Dell PowerEdge Physical Disk
4. SNMP Dell PowerEdge System Health
5. SNMP Cisco System Health sensor

Bugfix: SMS messages were always cut off at 150 chars
Bugfix: Auto-discovery could not detect APC UPS devices
Bugfix: Fixed "Cannot locate protected program data" error message
Bugfix: Trigger settings were broken for xflow sensors with inherited triggers
Bugfix: Fixed memory leak in http sensors
Bugfix: Fixed memory leak in WMI/performance counter hybrid sensors
Minor bugfixes and improvements

October 4th 2012 - Version 12.4.4.3084/3085 [Preview]

New [Core]: The 64bit PRTG Core Server will be installed on 64bit Windows systems with at least 6 GB RAM (see https://www.paessler.com/blog/2012/08/20/prtg/prtg-goes-64bit); for systems not meeting these requirements the former 32bit core server will be used.
New [Sensors]: Added new "hybrid" sensors (experimental). They replace the according WMI sensors. For better performance, they try to use Windows "Performance Counters" to query data from the target system and use WMI as fallback.
- New: Hyper-V Virtual Storage Device BETA
- New: Windows Pagefile BETA
- New: Windows System Uptime BETA
- Offer an alternative to WMI monitoring (can ease the load for installations with many WMI sensors)
- Sensors use RPC for communications (less overhead than WMI) and require the "Remote Registry Service" to be enabled on the target systems, this is usually the case for Windows server products, but not for workstations.
- Please give us feedback on these sensors!
New [Sensors]: Added sensors for HP Proliant servers
- New: SNMP HP Proliant Network Interface
- New: SNMP HP Proliant System Health
- They might work on other HP devices as well.
- Please give us feedback on these sensors!
New [Sensors]: Added sensors for monitoring Dell server hardware
- New: SNMP Dell PowerEdge Physical Disk Sensor
- New: SNMP Dell PowerEdge System Health
New [Sensors]: Added Sensors for NetApp SANs
- New: SNMP NetApp License BETA: Shows remaining days of a NetApp license
- New: SNMP NetApp Enclosure: Shows hardware values
- Please give us feedback on these sensors!
New [Sensors]: Added sensors for hardware monitoring via SNMP (work for SNMP-enabled Windows and Linux systems as well as for the management software of hardware racks, e.g. Dell, HP, etc.)
- SNMP Memory
- SNMP Disk Free
- SNMP CPU Load
- Please give us feedback on these sensors!
New [Sensors]: SNMP Cisco System Health
New [Sensors]: Port Range Sensor scans a range or list of ports
New [Sensors]: WMI Custom String Sensor performs a custom WQL query and expects a string value as result
Improved [Libraries]: PRTG now comes with several pre-configured libraries: They show all bandwidth sensors, all CPU sensors, all memory sensors, all VMware sensors, etc.
Improved [Remote Probes]: Optimized sequences in Remote Probe installer and improvements for Remote Probe auto-update
Improved [EC]: Optimized user session management as well as various improvements and bugfixes for the Enterprise Console
Improved [Notifications]: New placeholder %commentsprobe can now be used in notifications (see https://www.paessler.com/knowledgebase/en/topic/373)
Improved [Translations]: Many changes to the translations: DE, FR, NL, BR, JP
Improved [Sensors]: XenServer sensors optimized for performance
Improved [Sensors]: Cisco IP SLA Sensor now shows additional values (channels) (existing sensors won't be changed)
Improved [Sensors]: SSH Remote Ping sensor now allows you to enter custom parameters
Improved [Sensors]: All NetApp sensors now also work with SNMP v1
Improved [Sensors]: FTP Sensor can now write results to disk (for debugging)
Improved [Sensors]: In the XML returned by EXE/Script (Advanced) sensors you can now define warning and error limits as well as custom warning and error messages
Changed [Sensors]: In the XML returned by EXE/Script (Advanced) sensors the sensor message length (<text>) is now limited to 2000 characters
Bugfix [Sensors]: XenServer sensors stopped receiving data in specific situations
Bugfix [Sensors]: SSH Disk Free Sensor could show incorrect percentage values and returned wrong values for AIX systems
Bugfix [Sensors]: WMI Custom Sensor did not show correct message in specific situations
Bugfix [Core]: A PRTG core server installation could provoke warning messages in Windows Server 2012 Server Manager
Bugfix [Webinterface]: Main menu did not show all available items for large configurations (limitations still apply within the "Devices | Group View" sub menu; please navigate through the device tree instead to see all available groups)
Bugfix [Webinterface]: Fixed an 'Operation not allowed on sorted List' error which occured in special cases
Many other bugfixes and improvements to the core, web interface, and cluster

September 13th 2012 - Version 12.3.3.2968/2969 [Preview]

Improved [Sensors]: In the XML returned by EXE/Script (Advanced) sensors you can now specify the encoding
Improved [Sensors]: WMI Service sensor can now write results to disk (for debugging)
Improved [Autodiscovery]: Optimized discovery of SNMP RMON sensors
Changed [Core]: Internet Explorer 10 can now be used to access the PRTG Ajax web interface
Changed [Sensors]: The Windows Scheduled Task sensor now supports tasks in sub folders and can monitor systems running on Windows 2003
Changed [Sensors]: SSH Port settings can now be set either on device or sensor level
Bugfix [Sensors]: HTTP sensors could show a false "302 moved temporarily" for some websites
Bugfix [Sensors]: Windows Print Queue Sensor did not accept ‘Min. Print Job Age' setting
Bugfix [Core]: For connections to the Enterprise Console via Active Directory logins a session timeout could occur
Bugfix [Core]: Double spaces (e.g. in object names) were removed from the configuration
Bugfix [Core]: Geo maps were not shown in Mobile Web GUI in some cases
Bugfix [Reports]: Dropdown list could show empty lines in some cases
Bugfixes: Several bugfixes for sensors and core as well as an updated manual

August 13th 2012 - Version 12.3.3.2650/2651 [Preview]

New: Language Brazilian Portuguese
New [Sensors]: Added Sensors for NetApp SANs
- New: SNMP NetApp Disk Free Sensor
- New: SNMP NetApp System Health Sensor
- New: SNMP NetApp I/O Sensor
- New: SNMP NetApp Network Interface
New [Sensors]: Added Sensor Family „Performance Counters“ (Experimental)
- New: Performance Counter CPU Sensor
- New: Performance Counter Custom
- New: Performance Counter Memory
- Offers an alternative to WMI monitoring (can ease the load for installations with many WMI sensors)
- Sensors use RPC for communications (less overhead that WMI) and require the “Remote Registry Service” to be enabled on the target systems, this is usually the case for Windows server products, but not for workstations.
Improved [Sensors]: HTTP Full Page Sensor can now store website screenshots
- just the last screenshot,
- or a screenshot for each sensor check
- screenshots can later be found in PRTG’s data folder (on the probe system)
- Use with caution, screenshotting requires a lot of CPU cycles and creates 1440 image files per day for a sensor with 1 min interval
Improved [Core]: PRTG web server can now run on https (SSL) on a user specific port (other than 443)
Changed [Sensors]: SSH Port settings has been moved to the device settings
Bugfix [Cluster]: Schedules did not work on all failover clusters
Bugfix [Sensors]: WMI Windows Security Center Sensor now works with Microsoft Defender anti-malware
Bugfix [Sensors]: Blacklist sensor rejected DNS zones like zen.spamhaus.org
Bugfix [Sensors]: Advanced options did not work properly for PrintQueue sensors
More than 100 other bugfixes and improvements as well as an updated manual

July 29th 2012 - Version 12.3.1.2450/2451 [Preview]

New [Cluster]: Users can now select which cluster nodes are used to monitor a specific group/device (e.g. when not all cluster nodes can connect to a subnet or VPN)
New [Sensors]: MS Exchange Transport Queue Sensor
New [Sensors]: Added a third option to the HTTP Full Page sensors. With this new third option you can enable screenshotting of each sensor run. You can either save only the latest screenshot, or each screenshot of this sensor. The image files will be stored on the probe system (user can set the number of days until the files are purged, creates a lot of data on the disk). This option needs plenty of CPU cycles and should not be used too heavily.
New [WebGUI]: Added an experimental feature that allows a user inside the WebGUI to install a remote probe on a Windows device in the sensor tree (Context menu of devices, device tools, install remote probe). The remote probe is automatically installed and configured. Afterwards it will show up at the bottom of the sensor tree and the user must approve the probe. Then sensors can be set up as usual. This is a great way to circumvent WMI or other connectivity problems by running sensors directly on the device.
Improved [Core]: When Active Directory integration is used all requests to the AD servers are now cached for one hour. Before this caching was implemented large and/or slow AD environments could potentially slow down PRTG’s user interfaces. If a password is changed in the AD you must either wait for 1h or clear the cache manually (on the status page).
Improved [Graphs]: Graphs now display the applied averaging interval at the bottom right
Improved [Sensors]: Added timestamp into emails of email round trip sensors
Improved [Sensors]: SNMP Custom String now supports RegExp
Improved [Sensors]: When devices need extensive time to answer WMI requests the sensor will be labeled “sluggish” because these sensors can actually affect the performance of the complete WMI system for all devices. We recommend to either install a probe directly on these devices or at least move these sensors to a dedicated probe
Bugfixes: Various bugfixes for the EC, core, sensors and probe

July 17th 2012 - Version 12.3.1.2319/2320 [Preview]

New [Sensors]: WMI HDD Health sensor (supports local and remote SMART monitoring via WMI). Note: the old HDD Health sensor which was based on local API access to SMART technology and which was only available on probes) is now deprecated
New [Sensors]: SSH Script sensor (allows you to run a custom script on a OSX/Linux/Solaris system and send back results as sensor values)
New [Sensors]: Dell PowerVault MDi Sensor (monitors DELL MD3000(i) SANs)
New [Sensors]: SNMP Cisco ADSL Sensor (monitors the line quality of ADSL connections of a Cisco router)
New [Sensors]: SSH Remote Ping Sensor (performs PINGs on a remote machine)
New [Notifications]: Sample custom notifications (EXE and BAT)
New [Core]: Proxy support for various Core Server functions: Auto update, geo map tile proxy, activation, http notifications, sms notifications (set this up in the "System & Website" settings.
New [Auto-Update]: When Autoupdate fails the todo email to the admin contains the respective log files as attachments
Improved [Sensors]: Blacklist sensor, Print Queue sensor, FTP Sensor, WMI Vital sensor, WMI Service sensor, QoS sensors, and many more
Improved [Sensors]: Toplist Visualizations
Improved [Webserver]: Map refresh for public maps doesn't blank the screen upon reload
Improved [Sensors]: IMAP sensor now displays the number of emails in the mailbox as a channel
Various minor improvements for the WebGUI, Core Server, Enterprise Console, and manual