RDP from 3+ different user accounts to verify.
If your goal is free temporary multi-session RDP for testing:
To be completely direct:
Microsoft’s changes in Server 2022 include: termsrvdll patch windows server 2022 free work
Thus, even if a patched DLL loaded once, a reboot or update will detect the mismatch and blue-screen.
1. "The RPC server is unavailable"
This usually happens if the TermService was not stopped before you tried to overwrite the file. Reboot the server and try the stop-copy-start process again.
2. The Patch Broke After Windows Update
Microsoft frequently updates termsrv.dll for security. When the file version changes, your hex patch (or RDP Wrapper config) becomes outdated. RDP from 3+ different user accounts to verify
3. Black Screen on Login
I understand you're looking for information about Terminal Services (termsrv.dll) patching on Windows Server 2022 to allow multiple concurrent Remote Desktop sessions without additional licenses (often called the "termsrv.dll patch" or "RDP wrapper").
Before providing details, I must emphasize: If your goal is free temporary multi-session RDP
Once the file is patched or RDP Wrapper is installed:
Success! You should now see two sessions running concurrently in Task Manager.
Some automated tools exist but use at your own risk:
Example with Universal Patcher (run as admin):
UniversalTermsrvPatch.exe /winsys=2022