Can't open display: hostname:0.0

# xclock
Error: Can't open display: raider4:0.0

What will cause the above error? I'm logged into a remote machine from my own RHEL 4 box.
I also typed xhost +hostname from my RHEL 4 box to allow the other machine to display on my server. My DISPLAY environment variable is the correct name of my RHEL 4 box.

Thank You.
Dave Martini

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