Additionally, the error might occur due to a version mismatch between the Remote Desktop client and server or if the server is restarting. Now that you know the causes lets discuss the solutions.
1. Enable the Remote Desktop Protocol (on the Windows Machine)
If the Remote Desktop Protocol (RDP) is not enabled on the host machine, it will block remote connection attempts. Enabling RDP allows the machine to accept remote connections, resolving a common cause of the error. This step opens communication between your device and the remote system, letting the session proceed without security blocks or misconfigurations. If the issue persists, move on to the next potential fix below.
2. Allow Remote Desktop through Windows Firewall
Allowing Remote Desktop through Windows Firewall ensures that the necessary port is open for RDP connections. Without enabling this access, the firewall could block the traffic needed for Remote Desktop, preventing the connection from being established. This step is crucial to bypass firewall settings that might hinder authorized access.
3. Disable Third-Party Antivirus (if applicable)
Some users experience this issue with third-party security suites like McAfee Internet Security, which might mistakenly block the Remote Desktop port as a security threat. If this is the case, try disabling the real-time protection of your antivirus suite. The steps for doing this can vary depending on the antivirus program you are using. You can check our detailed guide for different antiviruses here.
4. Uninstall Third-Party Firewall (if applicable)
Deleting a third-party firewall might not fully resolve the issue, as the security suite could still be active. If the firewall is causing the problem, setting up a whitelisting rule to exclude Remote Desktop from its analysis is necessary.
5. Use the Remote Assistance Invitation
By creating a Remote Assistance invitation, you bypass potential blocks interfering with the Remote Desktop connection. This method uses a different protocol, avoiding network issues, firewall settings, or blocked ports often linked to Error Code 0x204. It allows the client and host to communicate through an alternate route, ensuring a secure and direct connection without relying on problematic network configurations. If the problem persists, proceed to the next potential fix.
6. Remove the Temp Folder for Remote Desktop (MAC Only)
If you’re facing it only on macOS, the temp folder used by the Mac Remote Desktop app may have corrupted files blocking the connection. These files can hinder how the app connects to remote servers, causing errors like 0x204. Deleting the temp folder allows the app to create new configuration data the next time it runs, removing the chance of stale or faulty data causing connection problems.
