For Windows Server 2019, patching the termsrv.dll file is a common method to bypass the default limit of two concurrent administrative RDP sessions without purchasing additional Remote Desktop Services (RDS) licenses. Most Useful Patch Methods
If you prefer not to edit Hex code manually, is a popular open-source "wrapper" that sits between the Service Control Manager and TermService. It does not modify the original termsrv.dll . It uses an .ini file to apply the patch in memory.
Legal & Compliance Notes
This process involves modifying the binary code of the Terminal Services library to disable "Single User" checks. Core Patching Workflow
: For specific builds like 10.0.17763.437 (a common Server 2019 version), users often manually search for specific byte strings (e.g., 39 81 3C 06 00 00 0F ) and replace them to force the system to skip the session check. Native GPO Alternative (No Patching Required)
To ensure a smooth and secure patching process, administrators should follow best practices:
