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Date: Thu, 21 Sep 2000 00:14:54 -0700
From: "Crist J . Clark" <cjclark@reflexnet.net>
To: Igor Serikov <bt@turtle.pangeatech.com>
Cc: Alfred Perlstein <bright@wintelcom.net>,
	freebsd-questions@FreeBSD.ORG
Subject: Re: openssh & FreeBSD 4.0: X11frorwarding
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On Wed, Sep 20, 2000 at 10:03:37PM -0700, Igor Serikov wrote:
> 
>   Alfred,
> 
>  The settings are:
> 
>   X11Forwarding yes
>   X11DisplayOffset 10
> 
>  When the forwarding is disabled sshd rejects the request immediately.
>  The debugging message bellow is issued by the local ssh client
>  after it failed to match the protocol name (MIT_MAGIC-COOKIE-1).
>  When looking to tcpdump listing I couldnot find any place where
>  the cookie was sent to ssh-captured port. Yet, the client
>  itself works with old sshd on another machine. So, the problem
>  is obviously somewere on the server side.

Not necessarily. Like you say, you don't see the magic cookie. Not all
X applications support magic cookies (and they need to be supported by
the individual apps). What program is giving you the trouble? Does
something like a vanilla xterm also fail the same way?

But why this changed with a server upgrade... that is troubling.

> On Wed, 20 Sep 2000, Alfred Perlstein wrote:
> 
> > Date: Wed, 20 Sep 2000 11:51:39 -0700
> > From: Alfred Perlstein <bright@wintelcom.net>
> > To: Igor Serikov <bt@turtle.pangeatech.com>
> > Cc: freebsd-questions@FreeBSD.ORG
> > Subject: Re: openssh & FreeBSD 4.0: X11frorwarding
> > 
> > * Igor Serikov <bt@turtle.pangeatech.com> [000920 11:28] wrote:
> > >  
> > >   Hello,
> > > 
> > >  I just have upgraded my machine from 3.3 to 4.0. This system has
> > > openssh
> > > as a part of the "world" and I decided to use it. It was the beginning
> > > of my
> > > troubles.
> > > 
> > >  When I type 
> > > "ssh -v localhost" everything goes fine until I try to 
> > > forward an X11 application. This gives me the following:
> > > 
> > > debug: Received X11 open request.
> > > debug: channel 0: new [X11 connection from localhost port 1999]
> > > debug: X11 connection uses different authentication protocol.
> > > 
> > >  "xauth list $DISLPAY" shows a good looking cookie. $DISPLAY is set
> > > correctly
> > > (localhost:10).
> > > 
> > >  There was no problem with the old ssh (one from ports).
> > > 
> > >  Is this a known problem ? 
> > 
> > What are your sshd settings (/etc/ssh/sshd_config) for X11 forwarding?
> > are you using 'ssh -X localhost'?
> > 
> > -Alfred
> > 
> 
> 
> 
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-- 
Crist J. Clark                           cjclark@alum.mit.edu


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