startx create port 6000

It should be used by X, if you use startx for your X session you can add “-nolisten tcp” to “defaultserverflags” in /usr/X11R6/bin/startx
If you use a DM you should be able to modify X server settings in the config file.
This port is created by X when we use level 3 and enter to KDE with startx.
Yo may block it using iptables so it won’t be a hole for hacker. Read here

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