You are trying to run an X application from an xterm and you get some or all of the following messages:
Xlib: connection to ":0.0" refused by server Xlib: Invalid XDM-AUTHORIZATION-1 key (failed key comparison) Gtk-WARNING **: cannot open display: :0.0 Xlib: connection to "linux:0.0" refused by server Xlib: No protocol specified
Everyone suggests things which "should work":
$ export DISPLAY=hostname:0.0 $ xhost +localhost
However, none of them work. You discover that you only have the problem when logged in as root. However, you need to be logged in as root, for example because you are installing Mozilla, and you are supposed to run it once as root to make sure that all the files are created to allow it to be run by other users.
The solution is to export the DISPLAY, etc., BEFORE logging in as root. That is, issue those commands when logged in as a regular user, THEN issue a `su' command to gain root privileges.
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