Remote Desktop Connection Error Code 0x904 Extended Error Code 0x7 ((link)) Jun 2026

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.

First, confirm that the network path between the two devices is functioning.

RDP uses both TCP and UDP packets. If a router or VPN drops the UDP packets during the handshaking phase, error 0x904 occurs. Switching to TCP fixes this stability issue. Press Windows Key + R , type gpedit.msc , and press Enter . This error typically occurs when trying to connect

If the RDP listener is corrupted:

Most common cause: The Windows version on the client and server have different CredSSP update levels (e.g., one patched for CVE-2018-0886, the other not). RDP uses both TCP and UDP packets

Example:

Few things are as frustrating for IT professionals and remote workers as a cryptic error message that blocks access to a critical machine. Among the most confusing of these is the accompanied by the extended error code 0x7 . Press Windows Key + R , type gpedit

“Remote Desktop Connection cannot verify the identity of the remote computer. Do you want to connect anyway?” Followed by: “An authentication error has occurred. The function requested is not supported. Remote computer: [IP or hostname]. Error code: 0x904. Extended error code: 0x7.”

Most cases resolve within 15 minutes by adjusting one of these three areas.

Sometimes, Network Level Authentication (NLA) or encryption mismatches cause the 0x904 error. On the remote host, open .