Enable X11 Forwarding from macOS X

In order to enable X11 forwarding from macOS client, you must first download XQuartz from https://www.xquartz.org/ and install it. Then, you must log out and log back in.

Next, you can remote into your server via ssh with -X or -Y option:

$ ssh username@server_ip -X

To verify that you have X11 forwarding, simply examine $DISPLAY variable while you are remotely logged in:

$ echo $DISPLAY

localhost:10.0

By the way, some Linux servers may not have X11 forwarding feature disabled by default. In this case, you must enable it by editing /etc/ssh/sshd_config file:

X11Forwarding yes

Enjoy Mac Life!