Warning: untrusted X11 forwarding setup failed: xauth key data not generated
Last login: Thu Oct 27 13:47:24 2016 from 192.168.1.13
xterm: DISPLAY is not set
Warning: No xauth data; using fake authentication data for X11 forwarding.
Last login: Thu Oct 27 14:16:13 2016 from 192.168.1.13
drwx------ 3 hayd staff 102 7 Nov 2014 .
drwxr-xr-x+ 42 hayd staff 1428 27 Oct 13:37 ..
-rw-r--r-- 1 hayd staff 7821 27 Oct 09:33 known_hosts
X11 forwarding should be enabled with caution. Users with the ability to bypass file permissions on the remote host (for the user's X authorization database) can access the local X11 display through the forwarded connection. An
attacker may then be able to perform activities such as keystroke monitoring.
For this reason, X11 forwarding is subjected to X11 SECURITY extension restrictions by default. Please refer to the ssh -Y option and the ForwardX11Trusted directive in ssh_config(5) for more information.
-x Disables X11 forwarding.
-Y Enables trusted X11 forwarding. Trusted X11 forwardings are not subjected to the X11 SECURITY extension controls.