X11 forwarding request failed on channel 0 Error and Solution

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The error “X11 forwarding request failed on channel 0” occurs when there is a problem with forwarding X11 graphical user interface (GUI) applications over SSH. The X11 forwarding feature allows you to run GUI applications on a remote server and display the results on your local system.

Possible solutions to this error include:

  1. Checking the SSH server configuration: Ensure that the SSH server is configured to allow X11 forwarding by checking the /etc/ssh/sshd_config file for the line X11Forwarding yes.
  2. Checking the firewall: Make sure that the firewall on the remote system is not blocking incoming connections on port 6000 (the default port for X11 forwarding).
  3. Installing an X11 server: If you are running an X11 server on your local system, make sure it is properly installed and configured.
  4. Setting the DISPLAY environment variable: Set the DISPLAY environment variable on the remote system to the value localhost:0.0 before starting the X11 application.
  5. Using the -X or -Y options: When connecting to the remote system via SSH, use the -X or -Y option to enable X11 forwarding, for example ssh -X user@remote_system.

If none of these solutions work, try checking the system logs for more information on the cause of the error.

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