icacls C:\Windows\System32\termsrv.dll /setowner "NT SERVICE\TrustedInstaller" icacls C:\Windows\System32\termsrv.dll /reset net start TermService
Open an elevated Command Prompt:
termsrv.dll (Terminal Services DLL) is a critical system file located in C:\Windows\System32\ . It manages RDP session handling, licensing validation, and concurrent connection logic. Every time a user connects via RDP, termsrv.dll checks:
Patching termsrv.dll on Windows Server 2016 is a powerful technique to remove the arbitrary two‑session limit, enabling team‑based remote administration, automated scripts, and efficient use of server resources. Administrators can choose between the transparency of manual hex editing, the convenience of TermsrvPatcher (a fully automated PowerShell script), or the runtime‑only elegance of RDP Wrapper.
, acts as a layer between the Service Control Manager and Remote Desktop Services. It loads the DLL with the necessary patches without permanently modifying the file on disk. Automated Scripts : PowerShell scripts like TermsrvPatcher
Run .\TermsrvPatcher.ps1 with Administrator privileges.
: By default, Windows Server allows only two concurrent administrative RDP sessions. Patching termsrv.dll
: For the patch to take effect, the Remote Desktop Service (TermService) must be stopped, and the administrator must take ownership of the system file from TrustedInstaller to gain write permissions. Popular Tools and Methods Several community-developed tools automate this process: Patching Microsoft's RDP service yourself - Sam Decrock
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