xhost in RHEL4

I needed to illustrate how an operator could send an X application from a server to a workstation in his office (I'm talking here RHEL4 boxes).

Simple, done it loads of times - on the workstation do:

# xhost +server-name

On the server run the application from the command line and direct the output to the display on the workstation:

# xapplication -display workstation-name:0.0

WRONG! It's not that simple on RHEL4! Here, you need to enable TCP first, which is done as part of gdm (graghical desktop manager) configuration.

Run:

# gdmsetup

Select Security tab and notice that the following setting is "checked":

"Always disallow TCP connections to X server (disables all remote connections)"

Take the 'tick' off, restart the GUI (CTRL-ALT-Backspace), and all is well - the method shown above will now work.