After patching the DLL, Windows must be configured to allow a single user to maintain multiple distinct sessions rather than hijacking their own existing session. Press Win + R , type gpedit.msc , and press .
Open an elevated Command Prompt:
The patch targets specific byte sequences within the termsrv.dll file (located in C:\Windows\System32 ) to bypass the hard-coded session limit. : %SystemRoot%\System32\termsrv.dll .
Because Microsoft releases cumulative updates that modify termsrv.dll , the exact memory offset changes frequently. That is why generic "termsrv.dll patchers" often fail after a Windows Update—they rely on hardcoded offsets that may shift. termsrv.dll patch windows server 2016
Patching termsrv.dll on Windows Server 2016 involves applying updates through Windows Update or manually through the Microsoft Update Catalog. Here's a step-by-step guide:
While Windows Server 2016 officially supports Remote Desktop Services (RDS) to allow multiple users, this requires purchasing RDS Client Access Licenses (CALs). For non-production environments, labs, legacy application hosting, or small teams, the cost and overhead of RDS CALs can be prohibitive.
Understanding and Patching termsrv.dll on Windows Server 2016 for Concurrent RDP Sessions After patching the DLL, Windows must be configured
If you are looking to manage on a Windows Server 2016 instance, it's crucial to understand the risks of modifying the system's core files. Using the Remote Desktop Services role is the only supported way to allow more than two users.
Windows Updates frequently overwrite this file, requiring a re-patch.
Windows Server 2016, by default, allows only two simultaneous administrative remote connections. This is by design—Microsoft intends this for light server management, not for multi-user access scenarios. However, in lab environments, development servers, legacy application hosting, or even small businesses on a budget, the need for more than two concurrent users arises frequently. : %SystemRoot%\System32\termsrv
For Windows Server 2016 (most builds 14393–17763), search for this sequence:
If you do choose to patch, restrict it to non-production environments, maintain rigorous backup procedures, and stay vigilant about the security implications. The two-session limit may be inconvenient, but the alternatives can be considerably worse.
A: No. Feature updates replace the entire system image. You must reapply.
Are you running this in a or a production environment ?
Stop the Remote Desktop Services ( TermService ) service.