Quick X window problem

[Neil Marjoram]

Sorry to be a bit thick, I could find the answer anywhere. 

I am trying to display an X app from a different system on my system. It
does not seem to work on FC2, has anything changed?

What I am doing :

Remote :
export DISPLAY=hostname.here.uk:0.0

Local :
xhost +
access control disabled, clients can connect from any host

Remote :
./firefox &

(firefox-bin:28349): Gtk-WARNING **: cannot open display:

I've tried several apps but get similar problems.

Is there anything else that controls the security for X now? Or am I
being a little thick?

Thanks,

Neil.
-- 
Neil Marjoram.
Systems Manager
University College London
Adastral Park Campus
Martlesham Heath
Ipswich
Suffolk
IP5 3RL