Why do I get the error 'Xlib: connection to ":0.0" refused by server' when trying to run an X application after using su to switch to another user?

Solution Verified - Updated -

Issue

  • Why do I get the error 'Xlib: connection to ":0.0" refused by server' when trying to run an X application after using su to switch to another user?

Environment

  • Red Hat Enterprise Linux 4
  • Red Hat Enterprise Linux 5
  • Switch user (su)

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