[Wylug-help] X over ssh

[Don Magee]

Nigel Metheringham wrote:
> On Tue, 2006-04-25 at 10:30 +0100, Don Magee wrote:
> 
>>The DISPLAY variable isn't set. But on the machine that has full X 
>>installed and works over ssh it is set to
>>
>>localhost:10.0
>>
>>
>>
>>>This looks like you haven't got X forwarding enabled in ssh. I think that
>>>this feature can be disabled in the /etc/ssh/sshd.conf file for the sshd
>>>server. I think that it can be disabled on the client side also by a
>>>system wide setting in /etc/ssh/ssh.conf
>>
>>/etc/ssh/sshd_config has a line
>>
>>X11Forwarding yes
> 
> 
> Sounds like you haven't got xauth installed.  Make sure you have xauth
> in a standard (path accessible) location, and that it runs OK.  Normal
> place for xauth is
> 	/usr/bin/xauth
> 
> ssh sets up an xauth session when you log in with X forwarding.  If
> xauth isn't there then this won't work.
> 
> You can can also see what you get if you use -v on the ssh command - you
> *should* see something like
> 
>         > ssh -v -X otherbox
>         OpenSSH_4.3p2, OpenSSL 0.9.8a 11 Oct 2005
>         [... other stuff deleted ...]
>         debug1: channel 0: new [client-session]
>         debug1: Entering interactive session.
>         debug1: Requesting X11 forwarding with authentication spoofing.
>         debug1: Requesting authentication agent forwarding.
> 
> If there is no xauth you will also see
>         debug1: Remote: No xauth program; cannot forward with spoofing.
> 
> Unfortunately ssh does not appear to tell you if the remote end declined
> X forwarding - but if you don't see the xauth line, and still have
> DISPLAY unset after ssh-ing in then thats what happened.  Make sure the
> sshd was restarted after any config changes.
> 
> 

Installing xauth has fixed the problem.

Thanks to everyone that helped.


Don Magee