Best |verified| — Remote Desktop Connection Error Code 0x904 Extended Error Code 0x7

Severe packet loss or fluctuating internet bandwidth drops the RDP connection before a timeout flag is thrown.

Even if RDP is "Allowed," specific security layers may still block the connection. www.remoteaccesspcdesktop.com Allow MSTSC explicitly "Allow an app through Windows Firewall" Ensure both Remote Desktop Remote Desktop (WebSocket) are checked for Private and Public. Allow another app , browse to C:\Windows\System32\mstsc.exe , and add it with full permissions. Third-Party Antivirus : Apps like Bitdefender have been known to block RDP. Add to their exception lists. Spiceworks Community Step 4: Azure VM Special Case

If your connection drops right at the "Securing remote connection" phase, your host system's TermService likely cannot read the active TLS certificate. Severe packet loss or fluctuating internet bandwidth drops

Start with the fundamental checks: firewall configurations, ensuring remote access is enabled, and using a different RDP client for testing. If those yield no results, the problem likely lies within the security layer. The most consistently reported solutions involve ensuring both systems are fully patched with Windows Update, modifying Network Level Authentication (NLA) settings, or resetting the certificate store by renaming the MachineKeys folder.

Recent builds (22H2+) sometimes struggle with hostname resolution for RDP, throwing this error even when the network is fine. Allow another app , browse to C:\Windows\System32\mstsc

Search for "Allow an app through Windows Firewall" in the Start menu.

If this resolves the issue, add an exemption for mstsc.exe (remote desktop client) or create a firewall rule allowing port 3389. 4. Enable Specific Security Layer (RDP) Spiceworks Community Step 4: Azure VM Special Case

Check the expiration date. If expired, delete the old certificate.

Third-party security suites can suddenly start blocking RDP after an update.

: If you are using a VPN, disconnect and reconnect. Slow or high-latency VPN connections are a primary cause of this specific error code. Detailed Troubleshooting Guide 1. Fix Expired RDP Certificates (Server Side)

or via an alternative method (like VNC, VMware console, or physical access).