Patch Windows Server 2019 Repack =link= — Termsrv.dll

To manage your CALs, you need the RD Licensing role:

If manual hex editing is too complex, community-driven tools can automate the process:

Right-click the file, select , go to the Security tab, and take ownership of the file.

Limits connections based on installed RDS CALs. Termsrv.dll Patch Windows Server 2019 REPACK

: Executables (e.g., UniversalTermsrvPatch-x64.exe ) or PowerShell scripts that directly overwrite the system file with a modified version. Patching Microsoft's RDP service yourself - Sam Decrock

: Use a hex editor (like HxD) to find and replace the following pattern based on your build: Find : 39 81 3C 06 00 00 0F 84 XX XX XX XX Replace : B8 00 01 00 00 89 81 38 06 00 00 90 Restart Service : Run net start TermService . Method 2: Automated PowerShell Script

Are you trying to resolve a specific or connection limit issue ? Share public link To manage your CALs, you need the RD

However, many administrators, developers, and lab environments seek to enable multiple concurrent sessions without deploying a full, complex RDS infrastructure or purchasing expensive CALs for testing purposes. This has led to the popularity of modifying the system file responsible for managing these connections: termsrv.dll .

The patcher scans the DLL's hexadecimal representation for specific byte sequences that correspond to the session limit enforcement functions. It then replaces these sequences with patched values that bypass the restrictions. For Windows Server 2019, the pattern used is similar to Windows 10's approach, replacing a specific sequence with B8 00 01 00 00 89 81 38 06 00 00 90 .

The unmodified termsrv.dll enforces the “two concurrent sessions” limit for remote administration. The patch modifies specific byte patterns within the DLL to: Patching Microsoft's RDP service yourself - Sam Decrock

Open termsrv.dll in a hex editor (such as HxD). The exact byte sequence to search for and replace varies depending on the specific build version of Windows Server 2019.

You cannot modify the file while the service is actively running. Open as an Administrator. Run the following command to stop the service: powershell Stop-Service -Name "TermService" -Force Use code with caution. Step 3: Hex Editing the DLL

It essentially tricks the Remote Desktop Service into believing the server is operating in an unlimited licensing mode.

The Remote Desktop service ( TermService ) is stopped.