Expired certificates are a major culprit. On the remote computer: Certificates (Local Computer) by running certlm.msc Navigate to Remote Desktop > Certificates If a certificate is expired, delete it. Restart the Remote Desktop Services TermService ) via the Services app to automatically generate a new one. Use the Microsoft Store RDP App Users have reported that the Microsoft Remote Desktop app from the Windows Store often works when the built-in client fails due to these specific error codes. Allow Through Firewall Ensure RDP is permitted on both machines:
Windows generates a local cryptographic certificate to secure RDP sessions. If the server-side certificate becomes corrupt, expires, or suffers from broken private key permissions, the TLS tunnel cannot form.
I’ve been using RDP for years, but hitting was a new level of vague troubleshooting. The connection fails immediately during the “Securing remote connection” phase. No helpful message from Microsoft—just these codes.
Signals that the network connection is unstable, packets are being lost, or the Virtual Private Network (VPN) is too slow or improperly configured.
: Security software or the Windows Firewall might be blocking or port 3389. Recommended Solutions Connect via IP Address Try connecting using the remote server's IP address
: If your connection has high packet loss or insufficient bandwidth, the RDP protocol times out before it can finish the "security handshake". Certificate Corruption
If possible, try connecting from a different network (e.g., mobile hotspot) to rule out ISP throttling. 2. Grant Private Key Permissions (Certificate Issue)
Click (or Advanced System Settings > Remote tab).
A common solution is to renew the RDP certificate on the host machine.
0x904 (Extended Error 0x7) typically indicates a network-level communication failure security handshake rejection
If your network has a Maximum Transmission Unit (MTU) mismatch (e.g., VPN or PPPoE connections), the HTTP CONNECT packets sent to the RD Gateway may be fragmented. The server sees a malformed request and returns an invalid response, triggering 0x904.
Navigate to HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client . Create a new . Name it RDGClientTransport . Set the value to 1 (for HTTP) or 2 (for UDP). 4. Enable RDP on Target Computer
If issues persist, use gpedit.msc to set the security layer for RDP connections to "RDP" in Group Policy. Alternatively, consider temporarily disabling Network Level Authentication (NLA) to test connectivity.
"Remote Desktop Connection error code 0x904 extended error code 0x7 full"
: If you're connecting to a RD Session Host server, misconfigurations on the server side can cause connection problems.
Reconnect to VPNs, as unstable connections often trigger this error.
This guide provides a detailed look at what this error means, why it happens, and step-by-step solutions to fix it. What is RDP Error Code 0x904 (Extended Code 0x7)?