The "Universal" search string is often C7 05 XX XX XX XX 00 00 00 00 . You are essentially looking to change the instruction that limits the session count to 1. Option B: RDP Wrapper Library (Community Favorite)
Windows Server 2019 allows two concurrent administrative RDP connections by default (for server management). To enable more than two simultaneous users, you must install the role and configure a license server. termsrvdll windows server 2019
When a user initiates an RDP connection, the TermService (Remote Desktop Services) loads termsrv.dll to authenticate the user and spawn a session environment. The "Universal" search string is often C7 05
Understanding and Managing Termsrv.dll on Windows Server 2019 To enable more than two simultaneous users, you
Unlike consumer versions of Windows (like Windows 10 or 11) where termsrv.dll is hard-coded to allow only one user at a time, the Windows Server 2019 version natively supports without needing external patches or "wrappers".
Because it is a protected system file, Windows Resource Protection (WRP) monitors it. If the file becomes corrupted or deleted, Windows Server 2019 will typically attempt to repair it automatically via the component store.