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The client receives an error stating "Because of a protocol error, this session will be disconnected."
Have any been applied to this server?
The file (Terminal Services DLL) is a critical system library located in the C:\Windows\System32\ directory that manages Remote Desktop Services (RDS) connections on Windows Server 2019. By default, Windows Server 2019 allows only two simultaneous administrative RDP sessions without additional licensing.
Open C:\Windows\System32\termsrv.dll in a Hex Editor (like HxD). Search for the following hex strings based on your build version and replace them: Search for: 39 81 3C 06 00 00 0F 84 XX XX XX XX Replace with: B8 00 01 00 00 89 81 3C 06 00 00 90 For newer 2019 updates: termsrvdll windows server 2019
: Enabling this and setting a specific value (e.g., 999,999) defines the maximum allowable concurrent sessions supported by the server hardware. 3. Patching and Third-Party Tools How To Enable Multiple RDP Sessions in Windows 10/11
If you have a Remote Desktop Services (RDS) license, you don't need to touch termsrv.dll .
Cumulative updates frequently replace termsrv.dll to patch security vulnerabilities. If custom changes or third-party patches were applied to the file, a Windows Update will overwrite them, reverting the system to default connection limits and breaking custom configurations. Troubleshooting and Repairing termsrv.dll The client receives an error stating "Because of
Understanding termsrv.dll in Windows Server 2019: A Deep Dive into Terminal Services
By default, Windows Server 2019 allows multiple users to log in simultaneously via RDP the server has been activated as a Remote Desktop Session Host with valid RDS Client Access Licenses (CALs).
Never expose port 3389 directly to the public internet. Use a Remote Desktop Gateway or a corporate VPN to shield the terminal server infrastructure. Open C:\Windows\System32\termsrv
In Windows Server 2019, the termsrv.dll file is located in the system directory: %SystemRoot%\System32\termsrv.dll
What specific of Windows Server 2019 are you running?
The primary role of termsrv.dll is to act as the Remote Desktop Session Host Server Remote Connections Manager. It is responsible for enforcing system policies related to remote connectivity, including: