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Chris Hall

Making technology fit my requirements...

Windows, Linux, Virtualisation, Unified Computing & Cloud Offerings Design Engineer.

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RDP So here is a little fix for an unlicensed remote desktop session host I found…



You have enabled remote desktop session host (also known as remote desktop terminal services mode) in trial mode on a Windows 2012 or Windows 2012R2 server some time ago and now you are receiving the error:

“The remote session was disconnected because there are no Remote Desktop Licence Servers available to provide a licence. Please contact the server administrator”

You may also notice Event ID: 1128 Source: TerminalServices-RemoteConnectionManager being logged in your system event log.


You are outside of your 120 day remote desktop session host evaluation period and / or the service has not been configured to register with a license server to install licenses.  A remote desktop licensing server is required for continuous normal operation.

Resolution 1

Install a remote desktop licensing server with the appropriate number of remote desktop session host licences and register your session host server with this.

Resolution 2

Re-arm your remote desktop session host evaluation to allow for another 120 days evaluation time. Here is how:

  1. Logon to your remote desktop session host server, open up regedit and navigate to

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\GracePeriod

  2. Right click GracePeriod key and select Permissions.  Grant Administrators full control as shown below: 

Wiring Mess 1

  1. Delete the L$RTMTIMEBOMB value leaving only the (default) value
  2. Reboot your remote desktop session host server
  3. Job done. You should have another 120 days evaluation time 

I understand that this resolution also works for Windows 2008, Windows 2008R2  As well as Windows 2012 and Windows 2012R2.