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./nfo/linux/x-server-nolisten-tcp.nfo.save.1
# To stop X from listening on port 6000

In file
"/etc/X11/xdm/Xservers"

change the line 
":0 local /usr/bin/X :0"

to 
":0 local /usr/bin/X -nolisten tcp :0"

restart X server.

EOF