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Please find the latest manual for PRTG Network Monitor here:

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

September 22nd 2010 - Version 8.1.0 - New Major Version

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

  • Bugfix: Fixed PRTG installer freezing (on some systems)

July 13th 2010 - Version

  • Bugfix: Fixed communication between core server and WinGUI (bug was introduced in build 5780)

July 12th 2010 - Version

  • Overview: This is a maintenance update with only very little changes
  • iPRTG: Improved support for object names with umlauts and other special characters
  • Bugfix: WMI Diskspace sensor did not support volume sizes beyond several terabytes

May 31st 2010 - Version

  • Overview: We are releasing V7.3.5 mainly to add support for iPRTG2
  • New: Support for new version of PRTG's iPhone App "iPRTG2"
  • Changed: Improved Oracle SQL server sensors
  • Bugfix: Minor bugfixes

May 10th 2010 - Version

  • Overview: This is a maintenance release
  • New: Trial version can now work with up to 5.000 sensors (was 500)
  • New: During auto discovery all device templates create a PING sensor with master dependency now (even if only one device template is selected)
  • Bugfix: Various smaller bugfixes

Mar 31st 2010 - Version

  • New: Added Placeholder %sensorid for Custom EXE Sensors
  • Bugfix: Fixed a small bug in reporting ('Sorry, your user account is not allowed to access this information", bug was introduced in Build 5610)

Mar 29th 2010 - Version

  • Overview: This update contains performance optimizations for large installations (>1000 sensors) as well as  bugfixes
  • New: Optimizations for large installations (thousands of sensors and more)
    • On installations with thousands of sensors PRTG's Web GUI felt sluggish under certain conditions
    • Thanks to various internal optimizations and an optional "speed mode" (see below) web pages can now be generated 5-50 times faster (compared to V7.3.2 or earlier)
    • Our test installations with 10.000 and 20.000 sensors now deliver all web pages (except for sensor lists) in less than 1 second (down from 5-30 seconds)
  • New "Speed mode" switch: When enabled (see System Settings|Webserver Settings) the following aspects of the software will change:
    • Slower updates for the data displayed in the web interface: It can now take up to 60 seconds for a new sensor state (up/down) to be displayed in the web interface (alerts/notifications will still be sent instantly) (Web GUI und Windows GUI)
    • Web GUI does not alert for new todos in the browser window (todo emails will still be sent instantly)
    • Web GUI does not dispay the mini graphs for sensors and at the top of the window
    • Web GUI does not show sensor-tree related menu items (devices by group, sensors by tag, sensors by type, sensors by group)
  • New: "Security Context" for reports (security improvement for reports): You can now select a user account for each report that will be used when creating HTML and PDF reports. Reports will only contain objects (devices, sensors, etc.) which the selected user is allowed to view. By default it is the user who has initially created this report (administrators are able to change this setting).
  • Changed: Improved memory handling when saving configuration (some users saw an out-of-memory error while the configuration was written to the disk)
  • Bugfix: Removed a potential deadlock in the dependency processing
  • Bugfix: For some users the PDF generator and config-check tool did not work due to spaces in pathnames
  • Bugfix: Fixed a sporadic handle leak in Custom EXE sensors

Mar 9th 2010 - Version

  • Overview: This maintenance release contains several stability fixes
  • New: Added new placeholders %probeid, %deviceid, %groupid, and %sensorid for notifications
  • Updated: Improved manuals (English and German)
  • Bugfix: Fixed a „division by zero“ error in IP-SLA sensors
  • Bugfix: Various stability improvements

Mar 2nd 2010 - Version

  • Overview: This is a maintenance release with some minor bugfixes and one security fix
  • Updated: Improved English and German manuals
  • Security: The (deprecated) "textlist interface" showed names and log entries of all groups and devices (but no sensors) even if the user account used in the URL had no explicit "read rights" for these objects.
  • Changed: Improved performance tof the process that receives toplist data from probes and stores it in the database
  • Changed: If storing of toplist data takes too long due to overload, PRTG drops data sets until the overload is overcome in order to ensure system stability
  • Bugfix: It was not possible to set schedules for the "Root" group
  • Bugfix: Fixed "List Index out of Bounds" error message during report generation
  • Bugfix: "Comments" display for objects did not show line breaks for read-only users
  • Bugfix: Fixed "Out of Memory" Error which occurred when HTML email notifications where shorter than five characters

Feb 15th 2010 - Version

  • Overview: This is mainly a maintenance release
  • Bugfix: Devices and sensors created by auto discovery did not always have the "inherit" checkbox enabled for user rights settings
  • Bugfix: Fixed a bug for sensor factory sensors that occured when many source sensors were down

Feb 1st 2010 - Version

  • Overview: Adds support for Chrome 4, fixes a few bugs as well as an SSL vulnerability and contains updated manuals
  • New: Completely revised English manual and help files
  • New: Completely revised German manual and help files
  • New: Support for Google Chrome 4
  • New: HTTP Advanced sensor now supports wildcards (? and *) for "response must/may not include"
  • Bugfix: Various stability enhancements
  • Bugfix: Rare "Line too long" error message in maps
  • Bugfix: Auto discovery did not work reliably for SNMP devices which have not been rebooted for 15 months or longer
  • Bugfix: Scheduled reports started too late with many pdf files in the reports folder.
  • Security: Disabled re-negotiation for TLS authentications (applies to SSL connections used in probe/core connections as well as HTTPS webserver connections). This blocks a potential man-in-the-middle vulnerability which is common for many software products that support SSL (see or for details)

Jan 13th 2010 - Version

  • Overview: This release features the new French translation, updated PRTG API documentation and stability improvements
  • New: French translation of the user interface
  • New: Updated documentation of the PRTG API (see "Help|PRTG API" in the web interface)
  • Improved: Email roundtrip sensors
  • Improved: Cloudwatch sensor now support the new US-West region of the EC2 service of Amazon AWS
  • Bugfix: Fixed a potential probe crash during autodiscovery when a specific type of device templates was used
  • Bugfix: Fixed a rare deadlock that could occur in the probe service for a complex set of prerequisites
  • Bugfix: Some sensors using SMB shares (File, Folder, Share Disk Free) showed the error 'Network name could not be found (67)' while the share was accessible in the Windows Explorer from the same computer
  • Minor Bugfixes
  • Please also note the following recent tricks from the blog:

Dec 10th 2009 - Version

  • Overview: A collection of bugfixes in response to user feedback
  • Bugfix: Minor fixes for the Windows GUI
  • Bugfix: Fixed "Error C4" on the "Top 10 List" page
  • Bugfix: Groups and devices showed a "Master dependency" setting which had no effect (applies to sensors only)
  • Bugfix: Limits for the "sum" channel of xFlow and sniffer sensors did not work reliably
  • Changed: Gauge type sensors were unnecessarily scanned twice upon sensor startup
  • Changed: Updated translations (Japanese and German)
  • Minor bugfixes

Nov 26th 2009 - Version

  • Overview: This update is only important when WMI monitoring won't even start on your system
  • Bugfix: Fixed a potential and rare deadlock in the WMI system

Nov 24th 2009 - Version

  • Overview: This build adds a few fixes to last week's V7.2.2 release
  • New: Added a sitemap for the web interface (in "Home" menu)
  • New: Added report period "Saturday-Friday"
  • Changed: PDF file names for reports show the report name and report period
  • Changed: WinGUI shows column "last value"
  • Changed: Updated English, German and Japanese user interface strings
  • Bugfix: Fixed error message "Could not load SSL library"
  • Bugfix: Fixed a web server session issue (only showed up for some fresh installations)
  • Bugfix: CTRL + right-mouse-click (to access browser context menu) did not work in Chrome
  • Bugfix: No more horizontal scroll bars for "sensor tree" map objects
  • Bugfix: Dependencies did not work correctly upon service restart when sensors were down when PRTG was stopped
  • Bugfix: Fixed code page problems of the WinGUI
  • A few minor fixes and changes

Nov 16th 2009 - Version

  • Overview: Version 7.2.2 offers various performance improvements and bugfixes
  • Performance and memory usage improvements
    • Improved processing of monitoring results: core server process uses substantially less CPU cycles (70-90% less)
    • Improved Windows GUI: quicker synchronization with core server
    • Improved web server: lower memory usage for session management
    • Faster data cache recalculation: now up to 10 times faster (such recalcs are only necessary when PRTG's database format changes, e.g. with new software versions)
    • PDF generator for reports now runs in an external process (faster, more reliable, better memory usage)
  • New: Reporting, "Historic Data" function and the API are now protected against potentially long running and blocking requests
  • New: Japanese installation of the interface (requires Japanese Windows version)
  • New: Autodiscovery assigns device icons that match the discovered device type (e.g. mail server, web server, etc.)
  • Changed: Improved WMI connection management
  • Changed: In order to work around certain bugs in the WMI system PRTG now tries alternate WMI queries for memory and cpu load sensors if the standard queries fail
  • Changed: Improved device template "Linux Machine"
  • Changed: Amazon CloudWatch sensor now supports monitoring of instances running in the "EU Region"
  • Changed: Improved printing for PRTG's web pages on Firefox
  • Changed: Dropped support for notifications with Yahoo Messenger
  • Changed: syslog and SNMP Trap sensor have been limited to a maximum of 100 messages per second
  • Changed: Number of allowed probes now depends on the license (starting with V7.2 all licenses except Site License were limited to 4 probes, limitations only apply to license keys purchased after Sep 2009):
    • Freeware: 4
    • Trial: 4
    • Professional 100: 4
    • Enterprise 500: 10
    • Enterprise 1000: 20
    • Enterprise Unlimited: 30
    • Unl. Site License: Unlimited
  • English manual updated
  • German manual updated
  • Several small bug fixes and enhancements

Oct 8th 2009 - Version

  • Overview: Improved server performance when WinGUI is used
  • Bugfix: Lower memory usage for the webserver when WinGUI instances were accessing the server

Oct 6th 2009 - Version

  • Overview: A few more bugfixes
  • Bugfix: Complex dependency problem: When devices with "Master Object" sensors were inside groups that had their own dependencies, these master sensors were not paused by group dependency and kept on running
  • Bugfix: Minor bugfixes for the WinGUI
  • Bugfix: Netflow 5 sensors accept NetFlow data streams from multiple IPs
  • Bugfix: DNS Sensors could not work with SOA records
  • Changed: If an installation uses a language file (.lng) which is not officially supported by Paessler, the installer does not switch back to an official language when an update is installed
  • Changed: reduced memory usage during recalculation of the cache

Sep 29th 2009 - Version

  • Overview: Since the initial release of V7.2 we were able to fix a few bugs reported by users. Thanks for your support and feedback
  • Bugfix: IP-SLA Sensor did not work for all users
  • Bugfix: In the Windows GUI multi-editing did not work when a password contained "#" character
  • Bugfix: Logfile rotation for web logs did not work properly at midnight
  • Bugfix: Starter Edition only supported 0 probes (instead of 4)
  • Bugfix: Deleting probes from the tree could cause a crash
  • Bugfix: Some Hyper-V sensors showed sporadic „Class not specified" Errors

Sep 21st 2009 - Version

  • Overview: This is a new relase with many new features and changes
  • New: Windows GUI
    • Especially for larger installations (500 sensors and more) the Windows based user interface is faster and more comfortable when managing sensors. The WinGUI includes all features of the former Tray Tool plus interactive editing of objects. It can be installed and used on multiple computers at once. You can continue to use the classic web-based interface, too.
    • Connects to a PRTG Core Server through HTTP/HTTPS (using our own PRTG API)
    • Displays the device tree, sensor list, alarms list, maps, reports etc.
    • Allows to add/edit/delete sensors, groups, and devices
    • Allows to arrange groups, devices and sensors using drag&drop
    • Allows to compare live data, graphs and historic data tables of two or more sensors
    • Alerts you with popup dialogs and/or sound alarm when events occur on the PRTG server
  • Additional Sensor Types
    • Support for sFlow and Netflow 9 (including support for NetFlow 9 on Cisco ASA)
    • QoS (Quality of Service) sensor measures vital network connectivity parameters like jitter, packet loss, and packet delay variation between two probes - the perfect tool to find network issues that can affect VoIP sound quality or video streaming hickups. Some vendors would call this a "VoIP Sensor".
    • IP SLA Sensor (monitors results of IP-SLA on Cisco routers, some would call this a "VoIP Sensor", too)
    • Amazon CloudWatch Sensor uses data from Amazon's CloudWatch service to monitor EC2 instances
    • Sensors for servers running Microsoft HyperV
    • RADIUS Server Sensor
    • Syslog and SNMP Trap receiver sensor
    • Sensors for Microsoft Exchange 2007 and more detailed monitoring of Exchange 2003
  • Improved Web-based User Interface
    • Multi Object Editing feature (e.g. edit the interval of 2 or more sensors at once)
    • Improved multi edit menu in tables of sensors, maps, reports, etc.
    • Improved "S" view for groups for large installations
    • User can select an icon for each device
    • You can now select two or more items from a search result to work on them
    • Toplists now show Pie Charts
    • Maps have a refresh icon at the bottom left, refresh interval can be set to 10/30/60 seconds
    • "Map Rotation" feature: The map display rotates through selected maps (select two or more maps from the list of maps and choose "Map Rotation" from the multi edit menu)
    • And many more
  • Improved Reporting
    • To improve reporting we have added new templates (Top 100 Lowest/highest sensor values, Top 100 best/worst uptime) as well as the following new default reports:
      • Top 100 Busy/Idle Processor Sensors
      • Top 100 Uptime/Downtime Report
      • Top 100 Fastest/Slowest PING Sensors
      • Top 100 Most/Least Used Bandwidth Sensors
      • Top 100 Most/Least Used Memory Sensors
    • Now also the Sensor selection for a report can be filtered by tag (e.g. to only include PING sensors in a report) and you can create "Working Hour" Reports (a schedule can be assigned to a report, data is only used for specified hours of day/week). And we have added new reports templates that only show data tables without graphs.
  • New: "Historic Data" feature allows to dig into the historic data for a specific time frame. You can display or export the raw data (each single monitoring request) as well as averaged data (exports to HTML, XML, CSV)
  • New: "Acknowledge Alarm" feature: Sensors with error state can be marked as "acknowleged". User can enter a message which is shown with the username as long as the error state goes on (e.g. this allows to show a "I will handle this" message in sensor lists). As soon as an alarm has been acknowledged, no further escalation notifications will be send for this sensor.
  • Updated: Improved "Unusual Detection": Detection has been simplified and now looks at hour of day and day of week
  • PRTG has been certified for the official "Works with Windows 2008 Server" logo by Microsoft


Earlier changes are listed in the version history of versions 7.0-7.1

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