Mountain Lion ssh -X problems How to run on Mountain Lion X11 forwarding via SSH?

Example:

ssh -X some@example.com xterm


my /etc/sshd_config has

X11Forwarding yes
#X11DisplayOffset 10
X11UseLocalhost yes

# XAuthLocation added by XQuartz (http://xquartz.macosforge.org)
XAuthLocation /opt/X11/bin/xauth


Restarted sshd with

launchctl stop com.openssh.sshd
launchctl start com.openssh.sshd


(and from the Preferences -> Sharing too)

Started XQuatrz, and from the xterm I run

ssh -v -X mrp@192.168.1.17 xterm        #this part not works :)


got the next:

debug1: Authentication succeeded (keyboard-interactive).
Authenticated to 192.168.1.17 ([192.168.1.17]:22).
debug1: channel 0: new [client-session]
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug1: Requesting X11 forwarding with authentication spoofing.
debug1: Sending command: xterm
debug1: Remote: No xauth program; cannot forward with spoofing.
X11 forwarding request failed on channel 0
xterm: Xt error: Can't open display: 
xterm: DISPLAY is not set
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug1: client_input_channel_req: channel 0 rtype eow@openssh.com reply 0
debug1: channel 0: free: client-session, nchannels 1
Transferred: sent 2656, received 2480 bytes, in 0.1 seconds
Bytes per second: sent 29582.4, received 27622.1
debug1: Exit status 1


from the xterm

$ echo $DISPLAY
/tmp/launch-BHtJfJ/org.macosforge.xquartz:0


changing it to :0 doesn't helps

running from the xterm

$ xauth list
jonatan.local/unix:0  MIT-MAGIC-COOKIE-1  f4f85682af36ae7d95cd3d244cb6beb2
192.168.1.9:0  MIT-MAGIC-COOKIE-1  f4f85682af36ae7d95cd3d244cb6beb2
jonatan.local:0  MIT-MAGIC-COOKIE-1  f4f85682af36ae7d95cd3d244cb6beb2


Any idea?
You need to open XQuartz, go to X11 → Preferences → Security, there are two check boxes: disable the first, enable the second. Restart XQuartz and try again. You will also need to define the $DISPLAY variable like this:

export DISPLAY=clienthost:0.0