Why is X11 Forwarding not working on my system when my ssh daemon is correctly configured with 'X11Forwarding yes' ?

Solution Verified - Updated -

Issue

  • Why is X11 Forwarding not working when ssh daemon is correctly configured with 'X11Forwarding yes' ?

  • Why are the following error messages seen in the verbose ssh client output

    debug1: Requesting X11 forwarding with authentication spoofing.
    debug1: Remote: No xauth program; cannot forward with spoofing.
    

Environment

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 4
  • Red Hat Enterprise Linux 3

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