Universal - Termsrv.dll Patch Windows Server 2012 R2

Use PowerShell to list all RDP sessions:

Get-WmiObject -Class Win32_LogonSession -Filter "LogonType=10" | Select-Object -ExpandProperty LogonId

Or query session for a quick view.

Navigate to C:\Windows\System32. Right-click termsrv.dll → Properties → Security → Advanced → Change owner to Administrators. Then grant your admin account full control. universal termsrv.dll patch windows server 2012 r2

Check concurrent sessions via:

qwinsta

Or attempt to initiate a third RDP connection. Use PowerShell to list all RDP sessions: Get-WmiObject