On the RDP client (your computer):
Extended error 0x7 may be a lie—the firewall might be stripping SSL packets. On the RDP client (your computer): Extended error
net start "Remote Desktop Services"
Mastering the Remote Desktop Connection Error Code 0x904 (Extended Error Code 0x7) On the RDP client (your computer): Extended error
Double-click and change the Value Data to 1 . On the RDP client (your computer): Extended error
The Remote Desktop Connection error 0x904 (Extended Code 0x7)
This is one of the most effective solutions for the 0x904 with 0x7 error, especially on Azure VMs or if you suspect a corrupted certificate store. It forces Windows to regenerate a new self-signed certificate for RDP.