The activation page is refreshed but this error message continues to appear: Status of license: Not activated Failed to establish secure connection Socket Error # 11001 Host not found.

The most likely cause of this error is an incorrect activation.dat file. 


If you already have a new activation code from the Paessler website: Manual license activation, follow the steps below to replace an outdated activation.dat file:

  1. Open the PRTG Administration Tool.
  2. Open the Service Start/Stop tab and stop the PRTG core server service.
  3. In your file explorer, navigate to the PRTG program directory: C:\Program Files (x86)\PRTG Network Monitor.
  4. Find the current activation.dat file and rename it, for example, activation_old.dat.
  5. Copy the new activation.dat file to the PRTG Network Monitor folder.
  6. In the PRTG Administration Tool, restart the PRTG core server service.


If your activation is successful, you can return to the PRTG program directory and delete the activation_old.dat file.


If the error persists, contact the Paessler support team.


Disclaimer:
The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.