Disable . 5. Whitelist RDP in Firewall
Sometimes error 0x904 happens because your previous session is trapped in a "ghost" or disconnected state on the host machine, refusing to let your new connection take over.
Network routing anomalies can prevent the client from mapping the path to the host PC. Resetting your network configurations clears out these communication glitches. i remote desktop connection error code 0x904 better
✅ – If you use mypc.local instead of 192.168.1.5 , certificate name validation passes every time.
Switching between Wi-Fi and ethernet, or dropping connection momentarily on a Virtual Private Network (VPN). Disable
Licensing issues often persist unless the licensing service is reset along with RDP.
More precisely, it is a during the RDP handshake. The client receives a certificate from the RDP server (Windows, Azure Virtual Desktop, or third-party gateway), but the client rejects it. Network routing anomalies can prevent the client from
| Error | Layer | Cause | |-------|-------|-------| | | TLS | Certificate validation failure | | 0x907 | CredSSP | Encryption oracle remediation (CVE-2018-0886) | | 0x516 | Network | TCP timeout / firewall | | 0x104 | Licensing | No RDS CAL available | | 0x80090302 | Security | Unsupported security protocol (e.g., server requires TLS 1.2, client only 1.0) |
: On certain infrastructure platforms like Azure Virtual Machines , the native Windows MachineKeys directory can become corrupt, preventing RDP from generating new encryption keys.
HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp Value: UserAuthentication = 0 (disable NLA, fallback to RDP security)