For IT administrators, developers, and tech enthusiasts who manage Windows Server 2016 machines, one limitation stands out as a persistent thorn in the side: the stringent two concurrent Remote Desktop Protocol (RDP) session limit.
Patching termsrv.dll circumvents Microsoft’s licensing requirements for multi‑user RDP access. While this is technically feasible, it violates the End User License Agreement (EULA) for Windows Server 2016. Organisations should evaluate their compliance posture before deploying the patch in production environments. For any commercial or critical deployment, purchasing the appropriate RDS CALs is the recommended, legally sound path.
This feature is strictly intended for server management, troubleshooting, and administrative maintenance. termsrv.dll patch windows server 2016
is a PowerShell script that automates the entire patching process. It supports Windows Server 2016 (as well as 2019, 2022, and client versions Windows 7/10/11). The script:
The safest but most difficult way; involves taking ownership of the file and manually changing hex values (e.g., changing 39 81 3C 06 00 00 0F 84 sequences). For IT administrators, developers, and tech enthusiasts who
Patching termsrv.dll modifies system files. This procedure is generally not supported by Microsoft and may violate the End User License Agreement (EULA). It is intended for testing or lab environments, not production, and can be reversed by Windows Updates. What is termsrv.dll?
While patching can solve immediate connectivity problems, it is crucial to keep your server secure and updated. is a PowerShell script that automates the entire
The termsrv.dll (Terminal Services DLL) is a critical system file in Windows Server 2016 that manages Remote Desktop Services (RDS). By default, Windows Server 2016 allows only (often called the "admin mode").
What of Windows Server 2016 are you currently running?
By default, termsrv.dll is owned by the TrustedInstaller account, preventing even administrators from modifying or replacing it. Open as an Administrator. Run the following command to take ownership of the file: takeown /f C:\Windows\System32\termsrv.dll /a Use code with caution.
Microsoft frequently updates termsrv.dll during monthly cumulative updates. A security patch will overwrite your modified file, requiring you to re-apply the patch. Prerequisites Before Patching
