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Allow X to connect to KDE

Edit /usr/X11R6/kde/3.5/share/config/kdm/kdmrc (Gentoo) or /etc/kde3/kdm/kdmrc (Ubuntu) and comment out the line:

ServerArgsLocal=-nolisten tcp

For basic X:

Edit /usr/X11R6/bin/startx and comment out the line:
defaultserverargs='-nolisten tcp -br'

Also check :  http://www.mohawksoft.org/?q=node/27

modify the kdmrc file to also have

Step two: (if you dare) add “-ac” to the ServerCmd line, mine looks like:
ServerCmd=/usr/bin/X -br -ac
This allows anyone to connect and control the machine. If you are behind a firewall, this isn't too dangerous, but if you want more security, use the “xhost” program to allow individual machines.