PAM RDP Access Requires Windows Licensing

Document ID : KB000121516
Last Modified Date : 29/11/2018
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Introduction:
When trying to RDP to a Windows Server from PAM users are seeing "License Server Not Available".
Instructions:
In order to RDP into a Windows Server, with either PAM or native RDP(mstsc.exe), the server must be licensed appropriately.  There is a period of time during which the server can be accessed even without a license.  After that period expires the system will become inaccessible if a license server is not available.  Here are details from Microsoft:  https://docs.microsoft.com/en-us/windows-server/remote/remote-desktop-services/rds-client-access-license#understanding-the-cals-model.