TermsrvPatcher

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A new, more complete solution is available: RDPControl

RDPControl is a full PowerShell module that covers everything TermsrvPatcher did — and much more:

• ✅ Multi-session configuration with -DryRun preview
• ✅ Automatic snapshot and restore
• ✅ Self-healing watchdog (survives Windows Updates automatically)
• ✅ Port management and firewall rules
• ✅ User access control
• ✅ Session management
• ✅ Full audit trail
• ✅ PowerShell Gallery ready

👉 Migrate to RDPControl

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Windows 11 25H2 support added!

Patch termsrv.dll so that multiple remote users can open an RDP session on a non-Windows Server computer

Credits

This work is based on the patch-termsrv.dll project by Rene Nyffenegger

Links

How to Allow Multiple RDP Sessions in Windows 10 and 11?

Multiple RDP (Remote Desktop) sessions in Windows 10

Prerequisites

Requires PowerShell 5.1 or higher

Download and install Windows PowerShell 5.1

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How to use

Download TermsrvPatcher.ps1 and place it in any folder, then run:

.\TermsrvPatcher.ps1

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Automate on Boot

To run the script automatically after updates, import the task into Windows Task Scheduler:

1. Open Task Scheduler: Run taskschd.msc.
2. Import: Select Action > Import Task... and choose TermsrvPatcherScheduledTask.xml.
3. Configure Path: The default path is C:\TermsrvPatcher.ps1. If your script is elsewhere, go to Actions > Edit and update the script path in the Arguments input.

Security notice: The scheduled task runs as SYSTEM with HighestAvailable privileges and passes -ExecutionPolicy Bypass to PowerShell. These settings are required because the task must modify a protected system file (termsrv.dll) without a UAC prompt at boot. The practical consequence is that whoever controls the script file controls what runs as SYSTEM — ensure TermsrvPatcher.ps1 is stored in a location writable only by Administrators (e.g. C:\ or C:\Program Files), not in a user-writable folder such as Downloads or AppData. Do not use this scheduled task on shared or multi-tenant systems where non-administrator users could replace the script.

Supported Terminal Services versions:

• Windows 7 Pro SP1 64-bit
• Windows 10
• Windows 11 22H2, 23H2, 24H2, 25H2
• Windows Server 2016
• Windows Server 2019
• Windows Server 2022 (including Datacenter Azure Edition / HCI, build 25398)
• Windows Server 2025

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See also

👉 RDPControl — the recommended replacement for this project.