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X-Authentication-Warning:	slinky.cs.nyu.edu: pechtcha owned process doing -bs
Date:	Sun, 8 Aug 2004 13:45:56 -0400 (EDT)
From:	Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To:	cygwin AT cygwin DOT com
To:	cygwin AT cygwin DOT com
Subject:	Re: how can I set $REMOTEHOST ( so I can set $DISPLAY with sshd w\X11 forwarding)
In-Reply-To:	<41154E0F.C0D8915F@dessent.net>
Message-ID:	<Pine.GSO.4.58.0408081343390.4727@slinky.cs.nyu.edu>
References:	<loom DOT 20040807T035049-115 AT post DOT gmane DOT org> <41150C47 DOT 6030900 AT alltel DOT net> <loom DOT 20040807T232016-729 AT post DOT gmane DOT org> <41154E0F DOT C0D8915F AT dessent DOT net>
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On Sat, 7 Aug 2004, Brian Dessent wrote:

> peter waltman wrote:
>
> > yeah.  pretty much.  I've set the "ForwardX11 yes" in the sshd_config
> > file on the server I log into and I've also set it in the ssh_config
> > with the client I'm using to log into it.
> >
> >    piano{pwaltman}51: ssh -X grad107m
> >    pwaltman AT grad107m's password:
> >    Last login: Fri Aug  6 19:16:42 2004 from lin04.eecs.tufts.edu
> >
> >    pwaltman AT GRAD107M ~
> >    $ echo $DISPLAY
> >    127.0.0.1:0
>
> It could be that if DISPLAY is set before you run ssh -X then ssh won't
> change it.  Try unsetting DISPLAY first.

This is wrong.  "ssh -X/-Y" will not enable X11 forwarding *unless*
DISPLAY is set in the local shell.

> Also, make sure there's nothing in your profile/bashrc stuff on the
> remote host that messes with DISPLAY.

This, however, is sound advice.  Try running ssh without the -X flag (or
even with a -x flag) and see if DISPLAY is still set.

> > if $?REMOTEHOST
> >    export DISPLAY=$REMOTEHOST:0.0
>
> If you do this your X session is no longer tunneled through SSH, and
> thus not secure.

Also correct.
	Igor
-- 
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