I--- Remote Desktop Connection Error Code 0x904 -

HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\Licensing Core

Insufficient bandwidth, packet loss, or slow VPN connections often result in this specific error.

If on an Azure VM, the MachineKeys folder may be corrupt. Use the Azure Portal's "Run Command" feature to rename C:\ProgramData\Microsoft\Crypto\RSA\MachineKeys and reboot. Summary Table: Quick Fixes Likely Cause Recommended Action Error appears instantly Expired Certificate Delete old cert in certlm.msc and restart TermService . Affects only Win 11 Hostname Bug Connect via IP address or use the Store app. Drops during login Unstable VPN/Net Check bandwidth; reconnect VPN. Blocked even if enabled Firewall Filter Explicitly allow mstsc.exe and WebSocket in Firewall. i--- Remote Desktop Connection Error Code 0x904

Remote Desktop Connection Error (often accompanied by extended error code

If another client works, the original client’s security settings or stored credentials are problematic. Summary Table: Quick Fixes Likely Cause Recommended Action

This is the most common fix for standalone servers and local PCs.

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\CredSSP\Parameters] "AllowEncryptionOracle"=dword:00000002 Blocked even if enabled Firewall Filter Explicitly allow

The (often accompanied by extended error code 0x7 ) is a common issue encountered in modern versions of Windows, including Windows 10, 11, and Windows Server 2019/2022. It typically occurs when the connection is established but immediately dropped or fails to authenticate due to security and network-level mismatches. Core Causes of Error 0x904

: Insufficient bandwidth, packet loss, or slow VPN connections often trigger this error.

Then reboot.