Fix: Remote Desktop Error 0x904 (Extended Error 0x7) Remote Desktop Connection (RDP) error code 0x904 with extended error code 0x7 is a common Network Level Authentication (NLA) and session-timeout failure. It happens when your computer establishes a connection to the remote server, but the handshaking process fails before the desktop loads.
The source IP was 127.0.0.1.
This error typically occurs when trying to connect to a Windows machine (Windows 10/11 Pro, Enterprise, or Server) via Microsoft Remote Desktop Protocol (RDP). The combination of 0x904 (session lock failure) and 0x7 (authentication/credential rejection) points toward specific, resolvable causes. Fix: Remote Desktop Error 0x904 (Extended Error 0x7)
Here’s a focused troubleshooting guide for .
: A simple reboot of both the client and the remote host can often clear temporary service hangups or network glitches. This error typically occurs when trying to connect
Or use wireshark during connection attempt – filter tcp.port==3389 – look for (indicates encryption mismatch).
Interpreted simply, the client-side networking socket was unexpectedly closed during the connection handshake. However, the provides a more specific context. When combined, they indicate that the client could not properly negotiate or authenticate the session due to security conflicts, network issues, or configuration mismatches. : A simple reboot of both the client
"Require user authentication... using Network Level Authentication (NLA)" Microsoft Learn 🌐 Network & Environment Checks Use IP instead of Hostname:
: System upgrades (like transitioning to Windows 11) or Azure VM maintenance can corrupt the MachineKeys folder. This prevents the system from reading or creating encryption keys.