The is a generic network-related failure that prevents a client from establishing a session with a remote host. While it is often caused by unstable network conditions, it can also stem from expired security certificates, firewall blocks, or specific Windows 11 compatibility issues. Common Causes of Error 0x904
Enable and set it to RDP .
Check the expiration date of the certificate. If it is expired, right-click and it. The is a generic network-related failure that prevents
Search for in the Start menu. Click Change settings .
Windows Defender or third-party antivirus software (like Bitdefender) blocking mstsc.exe or RDP traffic. Check the expiration date of the certificate
Insufficient bandwidth, high packet loss, or a sluggish VPN connection.
Log into the remote server (via a console or alternative remote tool). Press , type certlm.msc , and press Enter . Navigate to Remote Desktop > Certificates . Click Change settings
For users seeing this error on Azure Virtual Machines, renaming the key store folder can force Windows to rebuild the certificate environment. In the , go to your VM and select Run command .