For testing, lab environments, or budget-constrained setups, modifying the termsrv.dll file removes this session limit. This guide explains how the patch works, how to implement it safely, and the risks involved. Understanding termsrv.dll and the Session Limit
Use the function to locate the original hex signature for Windows Server 2016. Replace the original bytes with the patched bytes.
To keep this setup functional long-term, consider blocking automated Windows updates on non-critical testing servers, or prepare a script to automate the patch re-application after update cycles.
(Note: The exact bytes may vary slightly depending on the specific Windows Server 2016 cumulative update installed. Always check your specific build number before editing.) Using Automated Scripts termsrv.dll patch windows server 2016
While patching termsrv.dll is effective for lab environments, it comes with significant drawbacks that make it unsuitable for production environments. 1. Legal and Licensing Violations
Improper patching or mismatched versions can result in the Remote Desktop service failing to start, leading to complete loss of remote access.
Modifying system DLLs can lead to system crashes or unexpected behavior. Replace the original bytes with the patched bytes
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Copy-Item C:\Windows\System32\termsrv.dll.bak C:\Windows\System32\termsrv.dll -Force Restart-Service -Name TermService Use code with caution. The Patch Stops Working After Windows Update
: The original termsrv.dll file remains completely unmodified on the hard drive. Always check your specific build number before editing
You cannot modify the file while it is in use by the system.
Windows Updates frequently overwrite this file, requiring a re-patch.
Windows Server 2016 allows remote administration by default. It restricts concurrent Remote Desktop Protocol (RDP) connections. Only two administrative sessions can run simultaneously.
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:
Install the "Remote Desktop Session Host" role and purchase proper RDS CALs.