Check the expiration date. If expired, right-click and Delete the old certificate.
If the connection still fails, you can try lowering the security requirements via Group Policy. Navigate to Computer Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Security and set the "Security Layer" to RDP . 5. Alternative Connection Tools
Open Command Prompt as Administrator and run: restart-service termserv -force . i remote desktop connection error code 0x904 install
If you encounter this error on an Azure Virtual Machine, the certificate store might be corrupt.
Access the VM via the Azure Portal and select Run command > RunPowerShellScript . Check the expiration date
A misconfigured firewall can block the TLS handshake necessary for the connection.
Go to "Allow an app through Windows Firewall" and ensure both Remote Desktop and Remote Desktop (WebSocket) are checked for Private and Public networks. If you encounter this error on an Azure
How to Fix Remote Desktop Connection Error Code 0x904 The (often accompanied by extended error code 0x7) is a common issue in Windows 10, 11, and Windows Server environments. It typically signifies a failure to establish a secure TLS tunnel, often due to expired RDP certificates , unstable network connections , or firewall misconfigurations . 1. Renew Expired RDP Certificates