Modifying system files can make your OS unstable or insecure.

takeown /f C:\Windows\System32\termsrv.dll /a icacls C:\Windows\System32\termsrv.dll /grant Administrators:F Use code with caution. Step 3: Stop the Remote Desktop Service

Disclaimer: This post is for educational purposes only. Modifying system files may void warranties, break your OS, or violate software licenses. Proceed at your own risk.

Universal termsrv.dll Patch for Windows 10: Enabling Concurrent RDP Sessions (2026 Edition)

If you choose to manually patch the file using a hex editor, or use an automated patching tool, follow these foundational steps to ensure you can recover from a system error. Step 1: Take Ownership of the File

Open Command Prompt as administrator and type: net stop termservice Use code with caution.

copy C:\Windows\System32\termsrv.dll C:\Windows\System32\termsrv.dll.bak Use code with caution. Step 2: Take Ownership of the File

Ensure every user account on the machine has a complex password to protect against automated RDP brute-force attacks.

Automated tools look for the specific signature patterns inside your current termsrv.dll and patch them dynamically in the system memory, leaving your original file intact. Step 5: Restart the Service Return to the window. Right-click Remote Desktop Services and select Start . Security and Stability Risks

Use RDPConf.exe to verify.

Multiple family members or colleagues can use one powerful desktop computer at the same time.

net start termservice