Xlib: connection to ":0.0" refused by server

From: Jonathan Taub (yonatan_at_il.nlayers.com)
Date: 04/29/04 

Date: 29 Apr 2004 08:52:42 -0700

I have Redhat linux 9.
After changing the host name via the command "hostname", every GUI
application I try to execute brings the following message:

Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified
 
 
(gedit:6582): Gtk-WARNING **: cannot open display:

Only rebooting solves this.

What exactly is the problem?
How do I fix it?

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