405 ? S 0:06 /usr/X11R6/bin/X -auth /usr/X11R6/lib/X11/xdm/authdir/authfi 406 ? S 0:00 -:0
These processes are the display drivers for the X window system. The X system is network capable, and this facility should be disabled. This can be done by changing a line in /etc/X11/xdm/Xservers from
:0 local /usr/X11R6/bin/X
to
:0 local /usr/X11R6/bin/X -nolisten tcp