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?
This article applies to PRTG Network Monitor 16 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. Only if there are too many installations running with the same key, you will see any system names here, i.e., only those which are not supported by the license. Otherwise, you will see an empty popup window with an OK button which means that there are not too many installations with the same license key running.
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 | License | 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.
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?
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.
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.
Please forward a screenshot of the "Setup -> PRTG status -> System status" page for analysis to email@example.com. Please refer to this knowledge base case.
I don't seem to have "PRTG Status" in "Setup". What's there is: "Account Settings" and "Optional Downloads and Add-Ons"
Are you using a PRTG administrator account?
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!