The error is usually a symptom of a security mismatch or a network timeout . Start by disabling NLA and forcing TCP-only connections; these two steps resolve roughly 80% of cases.
This lowers security slightly, so only do this to test if it resolves the error. 3. Clear the DNS Cache and Reset Sockets Sometimes the network "map" on your computer is stale. Open Command Prompt as Administrator.
If you are using a VPN, disconnect and reconnect. 0x904 is frequently caused by "MTU fragmentation," where the VPN packet size is too large for the network to handle. 2. Adjust RDP Security Settings (NLA) The error is usually a symptom of a
On the , press Win + R , type gpedit.msc , and hit Enter.
Change the value to (this allows the server to negotiate the security layer). If you are using a VPN, disconnect and reconnect
Indicates a failure to initiate the connection.
Here is a comprehensive guide to diagnosing and fixing this error. What Does Error 0x904 / 0x7 Actually Mean? In the world of Windows RDP: press Win + R
Ensure all rules for and Remote Desktop (UDP-In) are enabled (look for the green checkmark). 5. Disable UDP for RDP (Group Policy)
Search for . Click Inbound Rules .