Open services.msc and locate .

, ensure the Security Layer is set to "Negotiate" or matches the client's capabilities. Are you seeing this error on a Windows Server personal workstation

. Sometimes, the virtual driver used for RDP sessions glitches, causing the session to drop with a cryptic 0x3 code.

Ensure the default RDP port () is open and allowed through the Windows Defender Firewall .

Find and set it to Not Configured . Restart the machine. 5. Verify Remote Desktop Port & Firewall

If direct connection works, the problem is isolated to the gateway certificate.

Ensure the essential services are running on the remote machine.