Remote Desktop Connection Error Code 0x904 Extended Error Code 0x7 ✪

: If the error occurs on an Azure Virtual Machine, it may be due to a corrupt MachineKeys folder. Renaming this folder (e.g., to MachineKeys_old ) and rebooting the server can resolve certificate creation issues.

On the server side, the "ID badge" (the self-signed RDP certificate) might have expired or become corrupted. When your computer asks to see it, the server can't provide a valid one, leading to an immediate 0x904 error. How to Fix It

Microsoft released patches affecting TLS fallback. If error appears after updates:

: 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. : If the error occurs on an Azure

A: This confirms a TLS/Cipher mismatch . Windows 11 enforces more stringent modern security protocols by default. Your server might be configured to accept only older, less secure ciphers that Windows 11 refuses to use. Follow Solution 1 (Disable NLA) or Solution 7 (Registry TLS fix) to bridge this gap.

: Remote Desktop services rely on underlying self-signed or CA-signed SSL/TLS certificates to encrypt the pipeline. If the server's certificate expires or loses its private key binding, the client immediately drops the connection.

Replace the computer's hostname (e.g., workstation-01 ) with its local or public (e.g., 192.168.1.50 ). When your computer asks to see it, the

This is the most common culprit in modern environments (Windows 10, 11, and Server 2016/2022/2025). When a Windows 11 client attempts to connect to an older server (or vice versa), the TLS (Transport Layer Security) versions or specific cryptographic cipher suites do not align. For example, a detailed look in the server’s Event Viewer under these circumstances shows the error: "An unknown connection request was received from a remote client application, but none of the cipher suites supported by the client application are supported by the server. The TLS connection request has failed".

Run: REG ADD "HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server" /v MaxOutstandingConnections /t REG_DWORD /d 65536 . the computer. 5. Adjust Security Layers (Legacy Support)

Unlike general connection dropouts, this specific error code combination usually occurs after you enter your credentials but before the remote desktop session successfully initializes. It frequently impacts systems following Windows 11 updates, Azure Virtual Machines, and hardened enterprise environments running Windows Server 2019, 2022, or 2026. Direct Architecture Overview: Why Error 0x904 Occurs This prevents the system from reading or creating

: On virtual machines (such as Azure VMs), the system's RSA MachineKeys directory can become corrupt, preventing the RDP service from reading or creating necessary private keys.

Press , type certlm.msc , and press Enter to open the Local Computer Certificates Manager. Expand the Remote Desktop folder and click on Certificates .

Restart the service to generate a new one: Open Command Prompt as Admin and run: net stop termservice then net start termservice .