Issue was discovered with Windows Server 2012 RDS license service remaining in Grace Period after license service is applied.
"The remote session was disconnected because there are no Remote Desktop License Servers available to provide a license"
This is due to a bug in Server 2012 RDS licensing system. The RDS licening mechanism continues counting the Grace Period time.
There is a Microsoft hotfix available or follow the workaround.
http://support.microsoft.com/kb/2916846
To manually resolve:
HKLM\System\CurrentControlSet\Control\Terminal Server\RCM
Grant permissions of the following registry key
If the key Grace Period is present the license service has not removed the entry and will continue in an unlicensed mode.
The fix is the delete the Grace Period key
You will need to take ownership and grant permissions to the registry key
Reboot the the server
If the Grace Period key returns after the reboot, the listed hotfix must be applied
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