Remote Desktop Connection Error Code 0x904 Extended !!exclusive!!

NLA requires the client to authenticate before establishing a full RDP session. If NLA is enforced on the server but the client fails to negotiate the required security protocols, error 0x904 appears.

Some users report this error specifically after upgrading to Windows 11 , often requiring a shift from hostname to IP address for connections. Step-by-Step Solutions 1. Renew the Remote Desktop Certificate This is the most common fix for servers. Run certlm.msc to open the Local Computer Certificates . Navigate to Remote Desktop > Certificates . Delete any expired certificates . Remote Desktop Connection Error Code 0x904 Extended