Using an outdated Remote Desktop client application can cause compatibility issues.
If a handshake mismatch occurs between the client and server, lowering the Network Level Authentication (NLA) reliance temporarily can isolate the fault.
How to Fix RDP Error Code 0x904 (Extended Error 0x7) Remote Desktop Connection (RDC) error with extended error code 0x7 is a generic network-related failure that indicates the client cannot establish a stable connection with the remote host. This error often occurs immediately after entering credentials or right before the desktop would normally appear. Common Causes Using an outdated Remote Desktop client application can
If this error targets specific servers on a subnet while others function properly, an expired self-signed certificate is the most probable culprit.
Put together, the error is essentially saying: "Your computer and the remote server are talking, but they can't agree on a secure channel to start the session. The connection is being interrupted or rejected." The connection is being interrupted or rejected
Essentially, your computer is trying to talk to the remote server, but the secured "handshake" fails due to network hiccups or security certificate mismatches. Common Causes
The "Extended Error 0x7" often surfaces when the client and server cannot agree on how to secure the connection: Force RDP to use TCP only.
I can provide more specific registry or policy fixes once I know your setup. Unable to RDP into some Windows Servers - Error code: 0x904
Remote Desktop error 0x904 (Extended Error 0x7) typically indicates a network connection failure
UDP can cause arena corruption on unstable networks. Force RDP to use TCP only.