The Remote Desktop error code 0x4 usually indicates a failure in the connection process, which can stem from a variety of issues, such as network problems, firewall restrictions, or improper configuration settings. Here’s a detailed summary of potential solutions and factors to consider for fixing this error.

1. Allow Remote Access: First and foremost, ensure that remote access is enabled on the target PC. This can typically be done through the system properties in Windows settings.

2. Check Network Connection: A stable internet connection is crucial for remote desktop functionality. Use the command ping.exe to test the network connection for any disruptions, delays, or packet loss. You might want to check both client and server systems to ensure they are connected seamlessly.

3. Firewall Settings: The firewall on the remote computer may be blocking Remote Desktop connections. You should check the firewall settings to ensure that Remote Desktop connections are permitted.

4. Configuration Settings: Review your configuration settings, including user permissions. Make sure that the user attempting to connect has the necessary permissions to establish a Remote Desktop session.

5. Modify Windows Registry: In some instances, modifying certain Windows registry settings may be required to resolve the issue. However, this should be approached with caution, and it's advisable to back up the registry before making any changes.

6. Network Level Authentication (NLA): Disabling NLA can sometimes resolve issues. If you have NLA enabled and are encountering the error, try switching to use RDP security instead of SSL/TLS.

7. Check Port Security: If the RDP port is unprotected, that may lead to connection problems. Ensure that the RDP port is secured and not open to the public, which is essential for maintaining network security.

For further detailed guidance, you can refer to the solutions provided in the following links:

• AnyViewer's guide on fixing error code 0x4
• Microsoft's forum discussion on error code 0x4
• TSPlus insights on RDP error code 0x4
• AirDroid's fixes for Remote Desktop error code 0x4

These resources can provide additional detailed steps that may help you in resolving the 0x4 error effectively.

Sources

How Do I Fix Remote Desktop Error Code 0x4? - AnyViewerRemote Desktop error code: 0x4 while accessing window containerWindows Remote Desktop Client fails to connect with error code 0x4 ...RDP Error Code 0x4 - TSplusRemote Desktop Internal Error 0x4 - using "Use web account to sign ...Fixes for Remote Desktop Error Code 0x4 - AirDroidAn Internal error occured error code 0x4 remote desktop connecting ...

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