What To Do if Sensors Show a "Not Licensed" Message?

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I'm getting a "Not licensed" or "Paused (exceeds license limitation of x sensors)" message for a number of sensors I added to the configuration. However, I have not reached the sensor limit for my license. How do I go about fixing this?

license prtg sensor

Created on Jan 25, 2010 9:57:28 PM by  Dirk Paessler [CEO Paessler AG] (11,093) 3 4

Last change on Jan 4, 2013 1:34:30 PM by  Daniel Zobel [Paessler Support] (24,941) 3 3



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This article applies to PRTG Network Monitor 8 or later

Sensors Showing "Not Licensed" Message

PRTG Network Monitor is licensed on a 'per sensor' basis, meaning that the license does not limit monitoring to a number of devices. Due to this license mechanism it is possible that under circumstances PRTG Network Monitor will display a "Not Licensed" message. This article explains what to check and do if parts of your sensors in PRTG Network Monitor display a blue status icon and show 'Not Licensed'.

First of all, head to the Setup | PRTG Status | System Status page of the web-based GUI (in older PRTG versions you might find it under "System | PRTG Status | System Status"). You will find valuable information there under Licensing. The important fields are Edition and Activation Status.

Freeware Edition (License key already in use)

If you find 'Freeware Edition (License key already in use)' in the edition field, then PRTG detected another instance of PRTG running with the same license key in your network (which is only allowed for Enterprise Unlimited Site licenses). To find out if this is the case you can try the following:

Open a command line session and use the following commands to find out what other machine is in your way:

cd "c:/program files/prtg network monitor" "prtg server.exe" SHOWNETUSERS

Note: If you did not install into the default folder please use your installation folder in the first command!

After a few seconds you will see a dialog box that will show all the machine names that run the same license key as your local installation. If PRTG is currently running on your machine, its name will also show up on the list.

Stop the second instance of PRTG and either revert to freeware mode (by removing the license key information from the 'PRTG Server Administrator Tool' and restarting the core service) or uninstall it. Then restart the PRTG services of your original PRTG installation.

Freeware Edition (Activation Grace Period Expired)

If you are running a commercial version and the program reports 'Freeware Edition (Activation Grace Period Expired)' under the "Edition" field or as the activation status, check under Setup | Activation Status from within PRTG. Please be aware that PRTG Network Monitor needs to be activated within 10 days (this is the 'Activation Grace Period') after the initial installation on a machine. As such, if you haven't activated, please try to do so using the automatic mechanism or, if this fails, use the activation by mail option.

Other Cases of 'Not Licensed' Sensors: Paused (exceeds license limitation of x sensors)

Most other cases with sensors showing a 'Not Licensed' status are caused by exceeding the limit of licensed sensors. This can be quickly discerned under the 'System Status' page. You will find also find the number of licensed sensors under 'Licensing', and the current total number of used sensors under 'Database Objects' on the right side of the page. If the number of current used sensors exceeds the number of licensed sensors, all sensors above that limit will be paused automatically with the status 'Not licensed'. In such an instance, please consider an upgrade to a higher edition of PRTG.

Created on Jan 25, 2010 9:59:10 PM by  Dirk Paessler [CEO Paessler AG] (11,093) 3 4

Last change on Sep 10, 2013 3:58:54 PM by  Gerald Schoch [Paessler Support] (6,173) 2 1



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What if I can't afford to upgrade the number of sensors right now? Can I just pause some of the other sensors? If I removed some of the other sensors I am not using why do these remain "Not licensed?

Created on Oct 14, 2010 11:23:13 PM by  SR (0) 1



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Your license allows to run the stated number of sensors at a time. For example, with a PRTG Network Monitor 500 license, you can run 500 sensors simultaneously. You can create more sensors than supported by your license, but these will be paused initially. You can then pause other (existing) sensors in order for the new sensors to start monitoring. Please note this only works with manually paused sensors.

Created on Oct 15, 2010 7:55:53 AM by  Daniel Zobel [Paessler Support] (24,941) 3 3

Last change on Jul 19, 2012 9:07:48 AM by  Daniel Zobel [Paessler Support] (24,941) 3 3



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I have the sensors "Not Licensed" probem but none of above answers match. The bottom of PRTG welcome page reads "PRTG Network Monitor 500 license supports 500 sensors". I have 141 sensors running (green) and 23 paused with "not licensed". So it seems like if there was 141 sensors limit. Any help appreciated.

Created on Sep 7, 2012 9:22:45 AM by  pawel (0)



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Please forward a screenshot of the "Setup -> PRTG status -> System status" page for analysis to support@paessler.com. Please refer to this knowledge base case.

Created on Sep 7, 2012 12:39:31 PM by  Patrick Hutter [Paessler Support] (6,894) 3 3



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I don't seem to have "PRTG Status" in "Setup". What's there is: "Account Settings" and "Optional Downloads and Add-Ons"

Created on Sep 7, 2012 2:16:12 PM by  pawel (0)



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Are you using a PRTG administrator account?

Created on Sep 7, 2012 3:02:51 PM by  Patrick Hutter [Paessler Support] (6,894) 3 3



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Damn... I am not admin. And also I didn't know that other user have created 360 sensors before me so that only 140 was left. My apology for silly question and thank you for help!

Created on Sep 7, 2012 5:06:17 PM by  pawel (0)



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