Termsrv.dll Patch Windows Server 2016 [top]

After saving the modified termsrv.dll , restore the original ownership and permissions, then restart the RDP service:

When running RDPConf.exe , if the status is not green:

If multiple RDP sessions no longer work after a Windows cumulative update:

If you prefer manual modification, you can use a HEX editor (like HxD) to change specific byte sequences. termsrv.dll patch windows server 2016

To enable multiple concurrent user sessions without purchasing Remote Desktop Services Client Access Licenses (RDS CALs), administrators often patch the termsrv.dll file. This guide explains how the patch works, how to implement it, and the associated risks. ⚠️ Important Warning and Legal Disclaimer

: Ensure that HKLM\System\CurrentControlSet\Control\Terminal Server\fSingleSessionPerUser is set to 0 if you want a single user to be able to open multiple sessions.

Follow the prompts to configure the RD Session Host and RD Licensing roles. After saving the modified termsrv

Are you encountering a (like "Access Denied" or "RDP Listener State: Not Supported")?

After replacing termsrv.dll with a patched version, users may encounter “Remote procedure call failed” errors that prevent all RDP access. This typically occurs when the patched DLL is incompatible with the current Windows build or when services fail to restart properly.

Patching termsrv.dll on Windows Server 2016 is typically done to enable multiple concurrent Remote Desktop (RDP) sessions without purchasing Remote Desktop Services (RDS) Client Access Licenses (CALs). ⚠️ Important Warning and Legal Disclaimer : Ensure

and replacing it with a sequence that ignores the session check. RDP Wrapper Library : An open-source tool, RDP Wrapper

To maintain system integrity, you should return ownership to TrustedInstaller .

There are two primary approaches to modifying termsrv.dll behavior: