RDP encryption settings on the client/server do not match.
This is a comprehensive checklist of solutions. It is best to try them in the order presented, as it moves from simple, non-invasive checks to more in-depth system modifications.
Check the expiration date. If expired, the old certificate.
Mastering the Remote Desktop Connection Error Code 0x904 (Extended Error Code 0x7) RDP encryption settings on the client/server do not match
The remote desktop connection error code 0x904 extended error code 0x7 can stop your work in its tracks, but it is almost always solvable. The path to a solution is logical: start with the fastest fixes like disabling NLA and checking firewalls. If those fail, the true culprits are almost always a corrupted certificate store (especially for Azure VMs) or an expired RDP certificate. By tackling these in the correct order, you can effectively resolve the issue and get back to business.
RDP relies on a self-signed certificate that may not auto-renew. If this certificate expires, the connection will fail instantly.
The most common scenarios where this occurs include: Check the expiration date
or via an alternative method (like VNC, VMware console, or physical access).
Once you resolve the error, implement these best practices to ensure it never returns:
Require use of specific security layer for remote (RDP) connections and set it to Microsoft Learn Are you connecting over a local network , and which version of is the host machine running? After Windows 11 Upgrade RDP Error 0x904 extended error 0x7 The path to a solution is logical: start
If NLA negotiation fails due to latency, the remote host sends back 0x7. Forcing RDP to use older authentication can bypass this.
NLA is a security feature that requires user authentication before a full RDP session is established. While secure, strict NLA settings often trigger error 0x904 if credentials or certificates fail to validate instantly. Press Windows Key + R , type sysdm.cpl , and hit Enter . Navigate to the Remote tab.