SSH -X “Warning: untrusted X11 forwarding setup failed: xauth key data not generated”

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Note that some incomplete answers might lead to security flaws.

  1. Using ssh -Y means here having fake xauth information which is bad!
  2. ssh -X should work since XQuartz, once enabled, uses xauth. The only problem is that ssh is looking for xauth in /usr/X11R6/bin and on macOS with XQuartz it is in /opt/X11/bin

Secure solution:

  1. Enable the first option in the Security tab of preferences (Cmd-,) which enables authenticated connections.

  2. Edit ~/.ssh/config, add XAuthLocation /opt/X11/bin/xauth to the host config.

  3. ssh -X your_server works in a secure manner.

  4. Ensure xauth is installed on the destination host.

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