Termsrv.dll Patch Windows Server | 2016 New!

Windows protects system files with ci.dll (Code Integrity). To use a modified DLL, either:

takeown /f C:\Windows\System32\termsrv.dll icacls C:\Windows\System32\termsrv.dll /grant "%USERNAME%:F"

The termsrv.dll patch for Windows Server 2016 remains a powerful, time-tested tool for breaking the two‑session RDP shackles in non‑production environments. It is a testament to the community's desire to bypass artificial restrictions for legitimate lab, testing, or legacy use cases. termsrv.dll patch windows server 2016

The primary motivation for patching termsrv.dll on Windows Server 2016 is to allow more than two concurrent users to log in to the server concurrently, effectively creating a "multi-user" server without installing the formal Remote Desktop Session Host role or purchasing CALs. Common use cases include:

If users get disconnected right after authentication, the hex patch may not match your specific Windows build version. Restore the backup using copy C:\Windows\System32\termsrv.dll.bak C:\Windows\System32\termsrv.dll and verify your operating system build number. Windows Update Reverted the Patch Windows protects system files with ci

Given the complexity of manual hex editing and the risk of error, most administrators prefer automated solutions. Two open‑source tools dominate the space.

Open an elevated Command Prompt:

To patch the file manually, use a hex editor (like HxD). If you are using Windows Server 2016 (Build 14393), look for the following byte patterns. 39 81 3C 06 00 00 0F 84 B1 7D 02 00 Use code with caution. Replace it with this hex string: B8 00 01 00 00 90 89 81 3C 06 00 00 Use code with caution.

When Microsoft releases a cumulative update that includes changes to termsrv.dll , the patch will be overwritten, and you will lose multi-session capabilities. You will need to re-apply the patch. The primary motivation for patching termsrv