How to disable X Window System Listening

To prevent from listening for remote connections, create the file /etc/X11/xinit/xserverrc and fill it with the following line:

exec X :0 -nolisten tcp $@

One of’s features is the ability to provide remote graphical display. This feature should be disabled unless it is required. If the system uses runlevel 5, which is the default, the GDM display manager starts X safely, with remote listening disabled. However, if X is started from the command line with the startx command, then the server will listen for new connections on X’s default port, 6000.

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