Are both machines running , or is one on Windows Home ?
user wants a comprehensive article about fixing Remote Desktop error code 0x904. I need to gather information about the error's causes and solutions. I'll search for relevant resources. search results show several Microsoft Q&A threads and other sources. I need to open the most relevant ones to gather detailed information. have gathered information from various sources. The article should cover the following sections: understanding the error, primary causes, immediate fixes, advanced troubleshooting, registry and group policy tweaks, firewall and network checks, client-side solutions, specific Windows 11 issues, a step-by-step troubleshooting flowchart, and a conclusion. I will now start writing the article. code 0x904 is one of the most disruptive Remote Desktop Protocol (RDP) errors, effectively cutting off all remote access to your machine. It typically appears with a Windows message stating, or "The connection to the remote computer was lost" .
Open Command Prompt as admin and run: restart-service termserv -force to generate a new one.
When you enable RDP on Windows, the system auto-generates a self-signed certificate. If corrupted or expired (often after a major update or cloning a VM), error 0x904 appears.
Before blindly applying registry hacks, let’s decode the error. Unlike generic “connection failed” messages, error 0x904 has specific roots in the .
Security certificate or authentication mismatches between the host and client.