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I'm accessing my Raspberry Pi 3 with PuTTY, and using X11 programs like GParted through ssh connection. It was perfectly working until I turned off IPv6 by adding the following line to /etc/sysctl.conf.

net.ipv6.conf.all.disable_ipv6 = 1

It does disable IPv6, but it makes X11 programs stop starting. It always shows message something like

pi@RPi-Dev:~$ sudo -E gparted
[sudo] password for pi:

(gpartedbin:1173): Gtk-WARNING **: cannot open display:

Why does disabling ipv6 cause it and how can I fix it?

  • Don't disable IPv6. It is not going away and you will need it sooner or later. – Michael Hampton Dec 15 '16 at 8:03
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The method I used to specify disabling command in /etc/sysctl.conf wasn't the right way. It did disabled IPv6 like other Debian based distributions, but what I had to do was adding following command in /boot/cmdline.txt.

ipv6.disable=1

Everything worked fine after adding the command in the file.

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