Right-click the patch program and select Run as administrator .
For administrators who prefer more control and auditability, PowerShell is an excellent alternative. The following script (based on the popular TermsrvPatcher.ps1 ) works with Windows Server 2012 R2 as well as newer server editions.
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Without the Remote Desktop Session Host (RDSH) role active, Windows Server 2012 R2 restricts connections to a maximum of two simultaneous administrative sessions . universal termsrv.dll patch windows server 2012 r2
Instead of manually modifying system files, use RDP Wrapper Library , which acts as a layer between the Service Control Manager and Remote Desktop Services. This method is safer because it doesn't modify termsrv.dll on disk.
The trade‑off is that RDP Wrapper must be kept up‑to‑date. When a Windows update changes the in‑memory structure of termsrv.dll , you may need an updated rdpwrap.ini file that contains the correct memory offsets for that build. The community maintains these files regularly.
Next to the Owner field, click and set it to your Administrators group or current account. Save the changes, then return to the Security tab.
The entire process is automated by most tools, requiring only that you run the script with administrative privileges. Right-click the patch program and select Run as
: Add the Remote Desktop Services role via Server Manager.
You will need to re-own the file and re-apply the patch using the updated hex signature specific to that new Windows update version. Summary Comparison Manual Hex Edit No third-party software needed; precise control. Breaks easily on Windows Update; complex for beginners. RDP Wrapper
For those seeking a less invasive and more update‑resilient approach, the RDP Wrapper Library offers an excellent alternative that keeps the original system file intact while still delivering the same concurrent‑session benefit.
Restricted to exactly one active session. This public link is valid for 7 days
While patching termsrv.dll solves an immediate operational bottleneck for free, it carries substantial long-term risks:
The termsrv.dll file is the core Dynamic Link Library responsible for managing Remote Desktop Services in Windows. Microsoft enforces connection limits directly within this file's compiled code.
Allows multiple users to log in simultaneously without kicking the active user off. Universal Support: