root     18063 18058  1 18:27 tty7     00:00:10 /usr/lib/xorg/Xorg :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
man Xorg
       TCP/IP
           Xorg listens on port 6000+n, where n is the display number.  This connection type is usually disabled by default, but may be enabled with the -listen option (see the Xserver(1) man page for  de‐
           tails).

user@hickup:~$ grep  ^xserver-allow-tcp /etc/lightdm/lightdm.conf 
xserver-allow-tcp=true
# issue a 'systemctl restart lightdm' # or whatever display manager your are using when configured to listen on port 6000
user@hickup:~$ xhost +glitch
user@hickup:~$ xhost
access control enabled, only authorized clients can connect
INET:glitch
SI:localuser:user
user@hickup:~$ netstat -an | grep LISTEN | grep 6000 && ps -ef | grep Xorg | grep -v grep
tcp        0      0 0.0.0.0:6000            0.0.0.0:*               LISTEN     
tcp6       0      0 :::6000                 :::*                    LISTEN     
root     21583 21576  1 18:45 tty7     00:00:07 /usr/lib/xorg/Xorg :0 -seat seat0 -auth /var/run/lightdm/root/:0 -listen tcp vt7 -novtswitch