Restart the server for the changes to the termsrv.dll file to take effect. 5. Verify Concurrent Sessions (Group Policy)
Even with a patched DLL, Windows Group Policy might still restrict users to a single session per person. To allow one user to open multiple distinct remote sessions, adjust the local policies: Press Win + R , type gpedit.msc , and hit Enter.
Locate . Double-click it, set it to Disabled , and click OK . universal termsrv.dll patch windows server 2012 r2
Open an elevated Command Prompt:
The "Universal termsrv.dll Patch" works by hex-editing this library file. It alters the specific bytes responsible for checking the operating system type and the concurrent session limits, effectively unlocking unlimited or expanded concurrent RDP sessions. Prerequisites Before Patching Restart the server for the changes to the termsrv
It is often used by small businesses or home labs to avoid the licensing costs associated with official Microsoft RDS deployments. How to Apply the Patch on Windows Server 2012 R2
Is this server for a or a testing/lab environment? To allow one user to open multiple distinct
Because it does not alter the actual file on your hard drive, it is highly resilient against Windows Updates. You only need to update the RDP Wrapper configuration file ( rdpwrap.ini ) when a new OS build drops. Risks, Drawbacks, and Legal Considerations
A universal patch for termsrv.dll can be useful in fixing various issues related to remote desktop connections, such as:
The core file responsible for managing Remote Desktop connections is termsrv.dll , located in the C:\Windows\System32 directory. When a user attempts to log in via RDP, this library checks the operating system edition and the active connection count. If the session count exceeds the allowed limit, the incoming connection is rejected, or an active user is prompted to disconnect. The Official Route vs. The Patch
If you prefer to patch the file directly, you must take ownership of the file first to bypass system protections. : Open Command Prompt (Admin) and run: net stop TermService Take Ownership : takeown /F "%windir%\system32\termsrv.dll" /A
