X forwarding over ssh -- how?

Hi,
look at this:

---------------

bob@nizo:~$
bob@nizo:~$ echo $DISPLAY
:0.0
bob@nizo:~$ ssh -X 192.168.178.2
Password:

Last login: Fri Jul 15 12:12:19 2005 from 192.168.178.3
bob@mitchell:~$ echo $DISPLAY

bob@mitchell:~$

---------------

This should say all. Incidentally the problem may lie with the setting of the
DISPLAY variable on the local host, because if I set it to anything other than
":0.0" no X application works. All of the following should be equivalent and
should work, but none does (the last one is the address assigned by the DHCP
server):

bob@nizo:~$ export DISPLAY=127.0.0.1:0.0
bob@nizo:~$ export DISPLAY=localhost:0.0
bob@nizo:~$ export DISPLAY=192.168.178.3:0.0

This is an out-of-the-box Debian Sarge installation, in case it matters.

Thanks,
robert

Robert Latest wrote:
> Hi,
> look at this:
>
> ---------------
>
> bob@nizo:~$
> bob@nizo:~$ echo $DISPLAY
> :0.0
> bob@nizo:~$ ssh -X 192.168.178.2
> Password:
>
> Last login: Fri Jul 15 12:12:19 2005 from 192.168.178.3
> bob@mitchell:~$ echo $DISPLAY
>
> bob@mitchell:~$
>
> ---------------
>
> This should say all. Incidentally the problem may lie with the setting of the
> DISPLAY variable on the local host, because if I set it to anything other than
> ":0.0" no X application works. All of the following should be equivalent and
> should work, but none does (the last one is the address assigned by the DHCP
> server):
>
> bob@nizo:~$ export DISPLAY=127.0.0.1:0.0
> bob@nizo:~$ export DISPLAY=localhost:0.0
> bob@nizo:~$ export DISPLAY=192.168.178.3:0.0
>
> This is an out-of-the-box Debian Sarge installation, in case it matters.
>
> Thanks,
> robert

You have to enable x forwarding at both ends check out
/etc/ssh/sshd.conf
/etc/ssh/ssh.conf
There are some options that need changed to yes.
They should be reasonable apparent.

Rage

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Robert Latest wrote:
> Hi,
> look at this:
>
> ---------------
>
> bob@nizo:~$
> bob@nizo:~$ echo $DISPLAY
> :0.0
> bob@nizo:~$ ssh -X 192.168.178.2
> Password:
>
> Last login: Fri Jul 15 12:12:19 2005 from 192.168.178.3
> bob@mitchell:~$ echo $DISPLAY
>
> bob@mitchell:~$

As well as enabling X forwarding at the local end, you also need to do
it at the remote end. The remote sshd_config file should have a line like:
X11Forwarding yes


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Paul Black mailto:paul.black@oxsemi.com
Oxford Semiconductor Ltd http://www.oxsemi.com
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