Unable to launch xwindows from aix ?

Unable to launch xwindows from aix box ..No clue whats wrong .Help me out how to debug this issue ?
export DISPLAY=ipadress:port.sessionid
then try launching application ...
I am getting error can't display
thanks,
kittu

Is your xserver alowed to access x-windows on the host machine?

check out the xhost command:
pSeries and AIX Information Center