X and nolisten tcp

Hello I have read that if one doesn't want to have X listen for remote connections one need only change ... :0 local /usr/X11R6/bin/X :0 vt07 to :0 local /usr/X11R6/bin/X :0 vt07 -nolisten tcp in the file ... /usr/X11R6/lib/X11/xdm/Xservers I have done so. I restarted xdm but netstat still shows X listening on all interfaces. I rebooted and still X is listening for remote connections. Anyone any ideas what the problem may be or which other config files could be changed to have the same effect. t-irvine