Xterm cannot open display?

Solution Verified - Updated -

Issue

  • Server gives the following error when connecting with xterm:

    xterm Xt error: Can't open display: localhost:10.0
    
  • xclock not working. When running xclock on the terminal, getting following error:

    Error: Can't open display: localhost:10.0
    

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6

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