Navigate to: Computer Configuration > Administrative Templates > System > Device Installation > Device Installation Restrictions .
Now try your RDP connection again.
Ensure the default RDP port () is open and allowed through the Windows Defender Firewall . rdp error code 0x3 extended error code 0x7
In 90% of cases involving Extended Error 0x7, Method A (adding the user to the Remote Desktop Users group) resolves the issue. The error is essentially the server saying, "I see you, but you aren't authorized to perform this handshake." "I see you
