X11Forward

Remote: myremote
Local: mylocal

Make sure X11Forwarding is enabled on remote server.

/etc/ssh/sshd_config
X11Forwarding yes

Step 1:

# ssh -X user@myremote

# xclock

# xauth list

myremote/unix:10  MIT-MAGIC-COOKIE-1  0c86bbc660cf37a8b3c843b190071835

# exit

Step 2:

# xauth list

# xauth add myremote/unix:10  MIT-MAGIC-COOKIE-1  0c86bbc660cf37a8b3c843b190071835

# xauth list

Step 3:

# ssh user@myremote

# xclock

You should be able to see xclock running on your local machine.