X11 forwarding over ssh is driving me nuts!

Hello,

I'm stumped. I can't get X11 forwarding over ssh running for the life of
me. The systems involved are both current Debian/stable. $DISPLAY
doesn't get set on the remote machine even though X11 forwarding is
enabled in the cfg file. The following 9 lines should explain
everything:

-----------
rl@kir:~$ echo $DISPLAY
:0.0
rl@kir:~$ ssh -X tops@grappa
tops@grappa:~$ echo $DISPLAY

tops@grappa:~$ grep X /etc/ssh/sshd_config
X11Forwarding yes
X11DisplayOffset 10
tops@grappa:~$
-----------


What's going wrong?

Thanks,
--robert

> I'm stumped. I can't get X11 forwarding over ssh running for the life of
> me. The systems involved are both current Debian/stable. $DISPLAY
> doesn't get set on the remote machine even though X11 forwarding is
> enabled in the cfg file. The following 9 lines should explain
> everything:
>
> -----------
> rl@kir:~$ echo $DISPLAY
> :0.0
> rl@kir:~$ ssh -X tops@grappa
> tops@grappa:~$ echo $DISPLAY
>
> tops@grappa:~$ grep X /etc/ssh/sshd_config
> X11Forwarding yes
> X11DisplayOffset 10
> tops@grappa:~$
> -----------
>
>
> What's going wrong?

Did you restart sshd after the last time you edited the config file?
Try ssh -vv and see what comes up about X11 forwarding. I see this from
a successful attempt:

debug1: Entering interactive session.
debug2: callback start
debug2: x11_get_proto: /usr/X11R6/bin/xauth list :0.0 . 2>/dev/null
debug1: Requesting X11 forwarding with authentication spoofing.
debug2: channel 0: request x11-req confirm 0
debug2: client_session2_setup: id 0


If this doesn't turn up anything useful, I would guess that sshd also
produces some useful debug messages. RTFM about how to use -d.

Robert Latest <(E-Mail Removed)> writes:

> I'm stumped. I can't get X11 forwarding over ssh running for the life of
> me. The systems involved are both current Debian/stable. $DISPLAY
> doesn't get set on the remote machine even though X11 forwarding is
> enabled in the cfg file. The following 9 lines should explain
> everything:
>
> -----------
> rl@kir:~$ echo $DISPLAY
> :0.0
> rl@kir:~$ ssh -X tops@grappa
> tops@grappa:~$ echo $DISPLAY
>
> tops@grappa:~$ grep X /etc/ssh/sshd_config
> X11Forwarding yes
> X11DisplayOffset 10
> tops@grappa:~$
> -----------
>
>
> What's going wrong?

Do you have ForwardX11 set in /etc/ssh/ssh_config on the local
machine? I forget whether ForwardAgent also needs to be set.
--
Joseph J. Pfeiffer, Jr., Ph.D. Phone -- (505) 646-1605
Department of Computer Science FAX -- (505) 646-1002
New Mexico State University http://www.cs.nmsu.edu/~pfeiffer

On Mon, 03 Apr 2006 10:51:39 -0400,
Allen McIntosh <(E-Mail Removed)> wrote
in Msg. <0EaYf.44$(E-Mail Removed)>
> Did you restart sshd after the last time you edited the config file?
> Try ssh -vv and see what comes up about X11 forwarding.

debug1: Requesting X11 forwarding with authentication spoofing.
debug2: channel 0: request x11-req
debug2: channel 0: request shell
debug2: fd 3 setting TCP_NODELAY
debug2: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug1: Remote: No xauth program; cannot forward with spoofing.

Ha! I hadn't installed xbase-clients. Now it works. Thanks!

robert