Remote Desktop error 0x904 (Extended Error 0x7) typically indicates a general network connection issue where the client and remote server cannot establish or maintain a stable handshake

3. Root Cause Analysis (Most Likely)

  1. Conclusion

    If after these steps you're still encountering issues, it might be helpful to:

    On the Remote PC, right-click "This PC" and go to Properties.

    Steps:

    Verify that the host pool is "Healthy" in the Azure portal. If the status is "Needs Assistance" or "Unavailable," the 0x904 error is just a symptom of the VM being stuck in a boot loop or update state.

    Open Command Prompt as Administrator and run: restart-service termserv -force (or restart the "Remote Desktop Services" in services.msc).