Termsrv.dll Patch Windows Server 2022

Patching termsrv.dll on Windows Server 2022 is a manual workaround used to bypass licensing restrictions and enable multiple concurrent RDP sessions. While Windows Server editions naturally support multiple sessions if the Remote Desktop Session Host (RDSH) role is installed, this patch is often used when administrators want to avoid RDS licensing requirements or enable concurrent sessions on non-RDS-configured servers.  Technical Overview 

Step 8: Lock the File (Optional but Recommended to prevent revert)

icacls C:\Windows\System32\termsrv.dll /setowner "NT SERVICE\TrustedInstaller"
icacls C:\Windows\System32\termsrv.dll /inheritance:r /grant:r "Administrators:RX" "SYSTEM:RX"

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Alternatively, run dism /online /cleanup-image /restorehealth then sfc /scannow. termsrv.dll patch windows server 2022

3. Stop Remote Desktop Services

net stop TermService /y

1. Right-click termsrv.dll > Properties > Security tab.
2. Click Advanced.
3. Change the Owner to the Administrators group.
4. Grant the Administrators group Full Control permissions.

RDP Wrapper (by stascorp) is another option, but it often struggles with Windows Server 2022 due to frequent build updates. If using this, you must keep the rdpwrap.ini file updated with the latest offsets. Patching Logic (Technical Breakdown) Patching termsrv