Ultimately, the best practice is clear: invest in proper RDS licensing. But for those who need to push the boundaries of an aging Server 2012 R2 infrastructure in a controlled lab, the universal patch remains a powerful—if unofficial—tool.

to allow more than two simultaneous administrative connections. Purpose and Functionality The patch targets the termsrv.dll file located in the %SystemRoot%\System32

Navigate to C:\Windows\System32 . Right-click termsrv.dll → Properties → Security → Advanced → Change owner to Administrators . Then grant your admin account full control.

After patching, termsrv.dll effectively behaves as if the server has an unlimited RDS license pack installed.

Or attempt to initiate a third RDP connection.