I Remote Desktop Connection Error Code 0x904 Better Jun 2026

The 0x904 error can occur if the self-signed certificate used by RDP is corrupted. Open ( Win + R ), type mmc , and hit Enter. Go to File > Add/Remove Snap-in .

Sometimes Windows updates change group policies regarding encryption. Press Win + R , type gpedit.msc , and hit Enter.

If the background services responsible for managing remote connections freeze or fail to start, you will experience connection timeouts. Press Win + R , type services.msc , and press . Scroll down and locate the following services: Remote Desktop Services Remote Desktop Services UserMode Port Redirector Right-click on each service and select Restart .

The host computer does not have remote connections enabled. i remote desktop connection error code 0x904 better

Ensure mstsc.exe is explicitly allowed through both Private and Public firewalls, ensuring and Remote Desktop (WebSocket) are checked in "Allow an app through Windows Firewall" . Review Summary Solution Effectiveness Difficulty Best For Certificate Renewal Single server failures IP Address Connection Windows 11 users Firewall Exception New setups / After AV updates Azure MachineKeys Fix Azure VM instances

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.

What (Home, Pro, or Enterprise) is running on the remote PC? The 0x904 error can occur if the self-signed

The Remote Desktop Connection error code 0x904 typically occurs when there is an issue with the Remote Desktop Protocol (RDP) connection. This guide provides steps to help you troubleshoot and resolve the error.

Explicitly add C:\Windows\System32\mstsc.exe to your firewall's allowed list.

Windows 11 updates occasionally introduce bugs that affect hostname resolution or standard RDP client stability. Press Win + R , type services

Remote Desktop Connection (RDC) is a feature in Windows that allows users to connect to another computer remotely and control it as if they were sitting in front of it. However, when attempting to establish a remote connection, users may encounter the error code 0x904, which indicates a problem with the connection.

This guide will break down what causes this issue, provide actionable solutions, and offer best practices for a better, more stable remote desktop experience. What is RDP Error Code 0x904?