Log into the remote server locally or via a different remote access tool.
: Antivirus software or Windows Defender Firewall may be blocking the connection on either the source or destination.
Expired self-signed certificates are a primary cause of this error on servers that haven't been rebooted in a while.
It looks like there's no response available for this search. Try asking something else. Unable to RDP into some Windows Servers - Error code: 0x904