Please go to the PRTG Download page to get the latest version!

September 19th 2011 - Version

The new major version number 9 of PRTG Network Monitor is available.

Please see the Release Notes for details.

July 14th 2011 - Version (final V8 build)

Note: During the update from any previous version lower than 8.2.x three databases must be converted which may delay the first restart after updating (for details, please see information about version below).

  • Bugfix: [Web Server] Fixed potential XSS vulnerability

June 27th 2011 - Version

  • Bugfix: [Maps] Fixed a problem with too many probes in map editor
  • Bugfix: [Settings] Master dependency setting was reset incorrectly under specific and rare circumstances
  • Bugfix: [Admin Tools] “Send Logs to Paessler” button in admin tools did not work
  • Bugfix: [Reporting] Incorrect averages in high/low reports 
  • Bugfix: [Sensors] Folder sensor does not count subfolders as files anymore when recurse is off

June 1st 2011 - PRTGdroid Version 1.1

Updated version available via Android Market. View app page

  • New: "Warning" and "Unusual" states can now be excluded from alarms count (=no notifications for these sensor states)
  • New: Main menu button "Favorites" shows the list of favorite sensors of the PRTG installation
  • Changed: App now contacts PRTG server to check credentials also when "passhash" is used
  • Changed: Icons and splash screen changed to match new look&feel of PRTG
  • Bugfix: App crashed after clicking the "Login" button while embedded browser showed login screen
  • Bugfix: Fixed "Quit" problem on HTC Wildfire

May 31st 2011 - Version

  • New: [Sensors] Added http proxy support for Pingdom and HTTP XML/REST Value sensors
  • New: [Sensors] xFlow sensors optimized to support more throughput (avoiding “flow processor buffer full” messages) - see article How many flows per second can PRTG handle in its xFlow (NetFlow, sFlow, jFlow) sensors?
  • New: [Maps] Object selector in maps editor loads faster for large installations
  • Changed: [Sensors] SSH sensors no longer perform an open port check on the SSH port before each monitoring cycle
  • Bugfix: [Maps] Refresh of maps failed occasionally 
  • Bugfix: [WebGUI] When creating SNMP oidlib sensors sometimes the list of available oidlibs was incomplete
  • Bugfix: [Sensors] Fast Custom EXE sensors (<20 ms run time) did not always return sensor results properly
  • Improved documentation

May 2nd 2011 - Version

  • Changed: PRTG icons and Paessler corporate logos updated
  • Changed: [Sensors] xFlow sensors now have a larger buffer and filter rules work faster
  • Bugfix: [Maps] Map editor did not work on Japanese browsers
  • Bugfix: [Sensors] Logfile sensor now handles locked files better
  • Bugfix: [Reports] Data lines in tables with downtimes are not properly shown with red background; fixed mouse hovering over report tables
  • Bugfix: [Sensors] When creating SNMP Library Sensors some items in the oidlib list were missing
  • Updated translations and manuals

April 18th 2011 - Version

  • New: All new map editor (complete rewrite): easier to use, get quicker results. Supports drag&drop when creating maps (see blog entry)
  • New: [Sensors] New Pingdom sensor can import current status and last request time of Pingdom checks into PRTG; see
  • New: [Sensors] IP SLA sensor identifies inactive IP SLAs
  • New: [Sensors] XML Rest sensor now supports JSON and HTTP authentication
  • New: [Sensors] Logfile sensor now supports regular expressions
  • Changed: [Webserver] For enhanced security, the webserver now only accepts ciphers with 128bit or more
  • Changed: [WebGUI] Disabled compatibility mode of IE8 on the login page
  • Bugfix: Feedback function did not work

March 28th 2011 – Version

March 21st 2011 – Version

  • Changed: [WebGUI] Usage of Google Maps now requires an official API Key from Google (see Knowledge Base article How do I get an API Key in order to use Google Maps with PRTG?)
  • New: [WebGUI] Support for Internet Explorer 9
  • New: [WebGUI] Status page now contains web server activity data (pageviews and requests per day, slow request ratio, etc.)
  • New: [Installer] Installer offers a quickstart manual after installation (EN, DE, FR)
  • New: [Sensors] Oracle SQL sensors now can return a string value
  • Bugfix: [Sensors] Oracle SQL sensors now handle double quotes in SQL Statement correctly
  • Bugfix: System emergency state could cause 100% cpu load
  • Updated manual
  • Several minor bugfixes for Windows GUI, for multibyte/Asian languages and for sensors

March 7th 2011 – Version

  • Changed: < and > can now be used in passwords
  • Bugfix: Fixed sporadic access violation errors in WinGUI
  • Minor bugfixes

March 1st 2011 – Version

  • New: [Web server] Performance Optimizations for multi-user scenarios
  • New: [System] Now all EXEs and DLLs (even our uninstaller and third party code) are digitally signed
  • New: [Sensors] New monitoring strategy for WMI sensors that improves reconnection time whenever client is rebooted
  • Bugfix: [WinGUI] WinGUI performed too many HTTP requests to the webserver
  • Bugfix: [WebGUI] In some cases the "save" button disappeared on the system settings page
  • Changed: [Sensors] On some Linux systems the SSH Disk sensor tried to monitor CD ROM drives for free disk space
  • Changed: [Reports] PDF rendering improved in order to achieve smaller PDF files
  • Changed: Updated translations (Japanese, German)
  • Various Bugfixes

February 16th 2011 – Version

  • [Translations] Added Dutch, French*, Chinese*, and Japanese* translation (*2% of strings still in English language)
  • [Sensors] Added 16 new sensor types (.NET 2 required on probe system if not mentioned otherwise)
    • HTTP XML/REST Value (consumes REST based XML APIs to retrieve a sensor value)
    • HTTP SSL Certificate Expiry (monitors the number of days left until the SSL certificate of a HTTPS website expires)
    • Traceroute Hop Count (monitors the number of hops required to reach a remote system and alerts when route changes)
    • Logfile Content Check (scans a text file and alerts if a certain string is contained within the file)
    • Windows Logged in users (monitors the number of active user sessions on a Windows system)
    • WMI Windows Version (monitors the currently installed Windows version)
    • Windows Last Update (monitors the number of days since the last Windows update)
    • Active Directory Replication Errors (monitors Active Directory domain controllers for replication errors)
    • POP3 Email Count (counts number of mails in a POP3 mailbox)
    • FTP Server File Count (counts number of files on a FTP server)
    • INI File Content Check (check the content of an INI file)
    • Ping Jitter (sends a number of PINGs to a remote system and calculates the Jitter value)
    • Ping with Delayed Up (intended to be used as a dependency sensor for devices where other services need extra time to become available after a (re-)boot)
    • Windows Print Queue (monitors the number of jobs and the state of a print queue on a Windows server, alerts e.g. if paper has run out)
    • Windows MSMQ Queue Length (monitors the queue length of a MS Message Queue Server)
    • IP on DNS Blacklist (checks various blacklist servers in order to verify if an IP address is blacklisted due to spam emails)
  • [Sensors] HTTP Transaction sensor now displays request time for each step of the transaction in an individual channel
  • [Webserver] Various performance optimizations, especially for the web interface for large installations (>500 sensors) and multiple simultaneous users
  • [WebGUI] Large live graphs now refresh with half the sensor interval: for sensors with short intervals you will see monitoring results coming in "live" without the need to click "refresh" manually.
  • [Reports] Added a new PDF generator (based on WebKit engine) for PDF reports (faster and not dependent on local IE installation)
  • [WinGUI]: Added Google Maps to WinGUI, various bugfixes
  • [Help] Added numerous context sensitive links from the WebGUI into the online manual
  • Changed: Native support for all instant messengers has been removed (please use external tools, see KB article)
  • Changes: Improved WMI stability (fixed PE054 flooding)
  • Bugfix: NetFlow 5 sensors now correctly evaluate TOS Byte
  • Bugfix: In some situations the spike filter did not work properly
  • Various smaller bugfixes and enhancements

January 25th 2011 – Version

  • [Sensors] 2 new sensor types: Monitor Virtuozzo Containers on Windows (Beta)
    • Virtuozzo Container Disk Usage Sensor
    • Virtuozzo Container Network Usage Sensor
  • Changed: [Core Server] More performance optimizations for lists on large installations (>1,000 sensors)
  • Bugfix: [Maps] On some non-English language installations the "Add Map Object" feature did not show all available map objects
  • About 100 improvements and bugfixes since version 8.2.0 last week

January 21st 2011 – Billing Tool for PRTG Version 1.0

We released a billing tool which retrieves monitoring data via the PRTG API and generates bills in PDF format. You can use this tool to bill your customers for certain usage reported by a specific PRTG sensor. Templates and calculation are customizable to fit many use cases. We provide this .NET open source tool as a basis to develop your own billing applications.

More info and download

January 17th 2011 – Version

  • [Core Server] New database format:
    • We implemented a new, faster database system for log, ToDo, and Toplist data. This new system is much faster and will provide a much swifter user experience, especially on systems with 500 and more sensors. In our tests we found that it can be up to 300 times faster, depending on your system and configuration
    • After upgrading to V8.2.x or later your previous databases will be converted during PRTG’s startup - which can take between a few seconds and a few minutes. Only the potentially huge multi-gigabyte Toplist databases will be converted in the background after the startup, as soon as the monitoring process has been restarted. During the conversion you may see drops of Toplists (gaps in your Toplist data) whenever the system performance is not capable of supporting simultaneous conversion and monitoring. Note: The old database files will be deleted 70 days after the database upgrade.
    • For detailed information, please see Knowledge Base article: Introducing a New Database Format with PRTG 8.2
  • [Sensors] Important change for Ping and Port sensors:
    • Their time values no longer cover the DNS resolution in their measurements, now values are analogous to the Windows built-in Ping command. Depending on the type of DNS entry used for the parent devices this can change the values dramatically to smaller values. For devices that are set up using IP addresses the values do not change at all.
    • For detailed information, please see Knowledge Base article: Behavior of Ping and Port Sensor Changed
  • [Auto-Discovery] Massive upgrade of the Auto-Discovery system:
    • Auto-Discovery now covers 95% of the available sensor types, depending on your network you may see 20-50% more sensors during an auto-discovery scan.
    • Added various options to enter IP ranges for auto-discovery, including Class A address ranges and IP lists. Note: Only subnets with up to 65536 IP addresses can be discovered.
    • Added 5 new device templates to the Auto-Discovery system, including “Linux SNMP”, “Server RDP”, and “XEN Server”.
    • Users can now select the time of day when daily and weekly auto-discoveries are performed (default is 4 a.m.).
    • WebGUI shows a note about potentially degraded performance while auto-discoveries are running.
  • [Device Templates] Massive upgrade of the device template system:
    • Now all sensors that make sense to be stored in device templates will be used (covering about 95% of available sensor types).
  • [Sensors] 3 new sensor types:
    • New DHCP sensor checks whether a DHCP request is answered by a DHCP server in the network
    • New SSH VMware ESX(i) Disk Sensor monitors disk space on attached storage of VMware ESX and ESXi servers via SSH
    • New jFlow V5 Sensor supports Juniper jFlow (version 5) monitoring. Note: Sensor does not support sampling yet, please disable sampling on the device (see user manual).
  • New: [Sensors] Added an alternate connection method for VMware sensors (.NET required on the probe system), during testing we saw some situations where the alternate connection worked more reliably than the default one.
  • New: [Sensors] EXE/Script sensors now support environment variables (all environment variables have a "prtg_" prefix)
  • Changed: [Sensors] The TCP port can now be selected manually for MySQL sensors
  • New: [Core Server] We implemented various performance enhancements that will mainly be visible on installations with 500 or more sensors. Many web pages created by the web server are now up to 100 times faster than before (on systems with thousands of sensors).
  • New: [WebGUI] Submit buttons on setting pages are now always scrolled into view automatically
  • New: [WinGUI] Various improvements of the WinGUI, including the option to select the default browser engine to open web pages.
  • New: [Reports] Reports with tables now include a list of down- and uptimes of a sensor
  • New: [WMI] Yet again, another bunch of WMI improvements, mainly for systems with many WMI sensors (500 or more)
  • Changed: [Cluster] "Simulate Error" now propagates across a cluster
  • Bugfix: [WebGUI] Fixed a potential Cross Site Scripting (XSS) vulnerability
  • Bugfix: In total more than 300 bugfixes and improvements are included in this build

November 16th 2010 - Version

  • New: [WebGUI] Improved object selector (used in map editor and for dependency setting), now supports search by name, tag, device or group.
  • Changed: [Installer] When installing an update after accepting the license terms the complete installation process (stopping services, copying new files, restarting services) runs without interaction in order to minimize downtime.
  • Changed: [Web Server] PRTG web server now only accepts HTTPS connections using SSL 3.0 (SSL 2 will not be accepted because it has security issues), see this Knowledge Base Article for details.
  • Various minor bugfixes and changes, see this Knowledge Base Article

November 10th 2010 - Version

  • Bugfix: [WinGUI] Fixed wingui<>core connection problems (bug was introduced in build 1760)
  • Various minor bugfixes and changes, see this Knowledge Base Article

November 3rd 2010 - Version

  • New: Added Spanish translation of the user interface
  • New: [Sensors] sFlow sensor now supports VLANs
  • New: [Sensors] Auto-Acknowledge option for Ping sensor (if sensor goes in to ALARM it will automatically switch to ALARM (Acknowledged)). This is a useful feature for devices that are shut down from time to time
  • Various minor bugfixes and changes, see this Knowledge Base Article

October 19th 2010 - Version

  • New: Added German translation of the user interface
  • New: Added SSH Inode Sensor
  • Bugfix: Minor bugfixes, see this Knowledge Base Article

October 14th 2010 - Version

September 29th 2010 - Version

September 27th 2010 - Version

September 22nd 2010 - Version - New Major Version

  • Version 8 marks a major leap forward for PRTG. We have implemented great new features including clustering and Google Maps, an updated user interface, a new manual, and many new sensor types. There were more than 1000 changes since version 7!
  • New: All-In Licensing for PRTG
    • With version 8, Paessler takes a revolutionary step and completely simplifies its licensing model. Using our new add-on-frede software product PRTG 8 you monitor your network without worrying about paying extra money for additional features. Everything is included in one license because we are confident this makes your work easier. Simply choose an installation size for your setup and benefit from the new functionalities PRTG brings to your network.
    • See Introducing the New All-In License Model for more information
  • New: "PRTG Cluster" Failover Solution
    • Up to 5 PRTG instances ("Nodes") work together
    • A cluster consists of one primary instance of PRTG ("Master Node") and 1 to 4 secondary servers ("Failover Nodes")
    • Objective 1: Achieve 100% uptime for the monitoring solution. Not even a software update causes downtime for a PRTG cluster.
    • Objective 2: Automatic failover: If the primary node fails or looses connection to the cluster, another node immediately becomes the master server and manages notifications => Notifications are always sent, even if the primary master has no connectivity or has crashed.
    • Objective 3: Multiple points-of-presence monitoring: All nodes monitor all sensors all the time. This means that response times are measured from different locations in the network (LAN/WAN/VPN) and can be compared with each other. Additionally, aggregated up/downtimes can be computed.
    • And here comes the best part of this new feature - our customer-friendly-licensing: All PRTG licenses allow you to create a "Single Failover" installation (two installations of PRTG working together) with just one license key (additional license keys are required for 3 or more nodes).
    • This means that you don't pay extra to use PRTG's new high-availability feature (compare with other vendors!). We assume that most commercial PRTG installations will be "Single-Failover" installations (1 primary node plus 1 failover node).
    • See the blog entry New Features in PRTG 8 - Part 3: Introducing "The PRTG Cluster" for more information
  • New: Improved and redesigned web interface: We've rearranged the web interface, added new on-mouse-over features, and redesigned the overall look and feel to make the web interface even more convenient for your daily work. For more information see the blog entries New Features in PRTG 8 - Part 1: Enhanced Web Interface and New Features in PRTG 8 - Part 5: A Little Slideshow
  • New: Added a "Mini-HTML" interface for mobile and low bandwidth access designed for iPhone, Android, Blackberry, Windows Mobile, Opera Mini, and even Internet Explorer 5/6 (does not require Ajax/Javascript)
  • New: Support for Google Maps in the web interface (maps that show red/green/etc. flags for down/up/etc. devices). Simply enter a postal address, city name, or geotag in the "location" field of groups and/or devices to populate the maps with live monitoring data!
  • New: Improved "Maps" feature: PRTG now includes 280 beautifully designed network icons and you can connect map objects with lines that follow their objects when they are moved. With the new editor, PRTG now supports you in creating maps of your whole network structure, even without additional background graphics.
  • New chart types: PRTG's charts are now easier to read with the optional new "filled" and "stacked" styles. For traffic sensors the in and out channel can be shown as positive and negative values. See New Features in PRTG 8 - Part 4: New Graph Types for more information.
  • New: Native and Agentless Linux Monitoring
  • New: Added New Sensor Types
    • NTP sensor
    • ADO sensor (i.e. support for all ADO compatible databases)
    • LDAP sensor
    • XEN Server sensor
    • WMI Hyper-V Virtual Storage Device sensor
    • WMI Terminal Server sensor
    • WMI Share sensor
    • WMI Uptime sensor
    • Windows Event Log sensor (Windows API based)
    • Linux SSH sensors (load average, meminfo, disk free)
    • Linux SNMP sensors (load average, meminfo, disk free)
    • VMware Host Hardware sensor (using WBEM)
    • WBEM Custom Sensor
    • See New Features in PRTG 8 - Part 5: New Sensor Types for more information
  • New: New, completely rewritten manual available in HTML and PDF formats (PDF version has more than 600 pages)
  • New: HTTP sensors and HTTP notifications now offer proxy support

  • New: Reporting is now fully decoupled from the web server and user interface, so report generation no longer affects user experience. This allows us to ease the minimum interval limits for reports: reports with 1 minute interval can now be created for up to 40 days instead of one day, 1 hour reports are possible for up to one year now.

  • Improved: Email notifications: Notification HTML emails now look great on most email clients.
  • Improved: Notification summarizing (to avoid email floodings)
  • Improved: WMI connection management
  • Improved: API - Many new features have been added to make it easier to create your own custom sensors and scripts.
  • New: Added a graphical visualization of sensor dependencies
  • Improved: Monitoring scheduler now avoids load peaks on monitored devices caused by simultaneous monitoring requests
  • Improved: Performance improvements throughout the whole software
  • Changed: Dropped support for Flash graphs in the web interface

  • Changed: Dropped support for Internet Explorer 7 by the Ajax interface (IE6 and IE7 can use the HTML-Only interface)
  • More than 1000 changes, features and bug fixes since version 7

July 22nd 2010 - Version - Final Build of Version 7