Licenses are not available for this Remote Desktop Session Host server

Licenses are not available for this Remote Desktop Session Host server

Environment: Windows Server 2012
Event ID:1131
Event Log Name: Microsoft-Windows-TerminalServices-RemoteConnectionManager

Message: The terminal server could not locate a license server in the %1 domain. Confirm that all license servers on the network are registered in WINS/DNS, accepting network requests, and the TS Licensing Service is running.

Reason:
This issue occurred when there are no licenses available or Remote Desktop licens grace period expired.
In my case RDS cals activated. But, still observed the errror in RD Licensing Diagnoser and showing 0 available licenses.

Solution: This issue can be resolved by deleting registry which starts with “L$RTMTIMEBOMB…..” at HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\GracePeriod\ and then perform server reboot. Then errors will be diappeared and RD Licensing Diagnoser shows the available RDS CALS.

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