I--- Remote Desktop Connection Error Code 0x904

Open Command Prompt as Administrator and run: restart-service termserv -force (in PowerShell) or simply restart the machine to force Windows to generate a new certificate.

| Step | Action | |------|--------| | 1 | Install Windows updates | | 2 | Set CredSSP to Vulnerable (temporary) | | 3 | Check server licensing mode | | 4 | Disable NLA on server (test only) | | 5 | Test with another RDP client | | 6 | Clear Credential Manager entries | | 7 | Run DISM / SFC | i--- Remote Desktop Connection Error Code 0x904

: Insufficient bandwidth, packet loss, or slow VPN connections often trigger this error. Mismatched encryption settings between the client and the

If another client works, the original client’s security settings or stored credentials are problematic. RDP relies on SSL/TLS certificates to encrypt the connection

Mismatched encryption settings between the client and the server, such as disabled TLS 1.2, can block the tunnel. How to Fix Error Code 0x904 1. Renew Expired RDP Certificates

Remote Desktop Connection Error (often accompanied by extended error code

This is a surprisingly common cause of authentication errors. RDP relies on SSL/TLS certificates to encrypt the connection. If your local computer's clock is significantly out of sync with the server's clock, the certificate validation fails, potentially resulting in a 0x904 error.