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X-Authentication-Warning: slinky.cs.nyu.edu: pechtcha owned process doing -bs
Date: Sun, 20 Oct 2002 21:47:52 -0400 (EDT)
From: Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To: cygwin AT cygwin DOT com
To: Jacob A <jacob AT minpost DOT nu>
cc: cygwin AT cygwin DOT com
Subject: RE: Openssh client under X
In-Reply-To: <Pine.BSO.4.44.0210202238320.23738-100000@britney>
Message-ID: <Pine.GSO.4.44.0210202137490.17047-100000@slinky.cs.nyu.edu>
Importance: Normal
MIME-Version: 1.0
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Jay,

I use ssh with X forwarding every day.  I also use it without X forwarding
when my DISPLAY is not set, and it works fine.  Here's what you should
try:

From a bash prompt in an xterm,
	$ unset DISPLAY
	$ ssh -v -x <youruser>@<yourhost>
(notice the lowercase 'x').

If this doesn't work, please report the results to the list.  If this does
work, you have ssh X forwarding enabled in one of the ssh config files --
consult the manpage to find out where to look and disable it.
	Igor

On Sun, 20 Oct 2002, Jacob A wrote:

> from the ssh manpage:
>
> <snip>
>
> -X      Enables X11 forwarding.  This can also be specified on a per-host
>         basis in a configuration file.
>
> <snip>
>
> "Enables X11 forwarding". This is NOT what I want to do. I simply want to
> get a login session on the remote machine.
>
> This problem is really getting to me now...
>
> I'm really curious to hear if anyone else on the list has got this
> working?
>
> please throw me an email if you do. thanks.
>
> /jay.
>
> On Sun, 20 Oct 2002, Gen Zhang wrote:
>
> > Try 'ssh -X'. With all capitalisations.
> >
> > Hope that helps.
> >
> > Genneth.
> >
> > -----Original Message-----
> > From: Jacob A [mailto:jacob AT minpost DOT nu]
> > Sent: 20 October 2002 21:06
> > To: cygwin AT cygwin DOT com
> > Subject: Re: Openssh client under X
> >
> > Thanx for the input!
> >
> > I believe "ssh -x" is the default behaviour, but even when I say -x I
> > get the same symptoms.
> >
> > What really confuses me is that it all works like a charm if I run:
> >
> > $ ssh <ip-address of host I want to connect to here>
> >
> > ...without starting X. (i.e click on the "cygwin icon"
> > (C:\cygwin\cygwin.bat) -- and start an interactive shell (bash) in the
> > cygwin environment.
> >
> > But, if I start X, (which I do with 'startx') -- and then open up an
> > xterm
> > and fire away the same command ($ ssh <ip-addr>), I get connected but
> > thrown out right away. I mean, I'm running the same binary -- what could
> > be different? This leads me to believe that the problem could NOT be on
> > the server side, it must be my cygwin that does _something_ differently
> > when I run the Xserver.
> >
> > Does this work for you? Can you use ssh to login to a remote host from
> > an xterm running in cygwin/XFree????
> >
> > Again - I am not primarly interested in "tunneling X" -- I know how that
> > works -- the problem is connecting with ssh at all.
> >
> > Any more thoughts?
> >
> > (again, I'm not subscribing to the list... please email me).
> >
> > /Jay
> >
> > On Sun, 20 Oct 2002, Igor Pechtchanski wrote:
> >
> > > Umm, how embarrassing...  I got confused between OpenSSH and SSH
> > > Secure Shell.  Apologies to all.
> > >
> > > Jay,
> > >
> > > ssh has a special mode where it forwards X requests over the ssh
> > > connection.  It's called X forwarding, and is enabled by either the -X
> > > command line option or a special entry in ~/.ssh/config (I forget
> > > exactly which, it's easily found out from the man page).  If the special
> > > entry is present, ssh will attempt to set up X forwarding, *but only if
> > > DISPLAY is set*.  That was the reason I asked about the DISPLAY setting.
> > >
> > > You can try running ssh as 'ssh -x', which disables X forwarding
> > > regardless of the config file.  If all you need is to run tty mode
> > > programs on the server, or if your machine is reachable and open to X
> > > packets from the server, that should be sufficient.  If 'ssh -x'
> > > works, you could then edit the config file and comment out the
> > > EnableXForwarding (or smth like that) line.
> > >
> > > If you do need to tunnel X packets through ssh when running X, you'll
> > > need to debug this further.  The message I mentioned might be of help
> > > then.
> > >     Igor
> > >
> > > On Sun, 20 Oct 2002, Jacob A wrote:
> > >
> > > > ok.
> > > >
> > > > maybe my last post was somewhat unclear.
> > > >
> > > > What I want is to be able to run is:
> > > >
> > > > $ ssh user AT host
> > > >
> > > > ...from an xterm window under cygwin/XFree86. Whenever I try that,
> > > > it connects, and then disconnects right after I get connected. If I
> > > > run ssh from cygwin without running X, it works like a charm. Correct
> > > > me if I am wrong, but the DISPLAY variable should have nothing to do
> > > > with this.  All I want is to login on the other machine.
> > > >
> > > > ssh -v -v -v tells me "channel 0 is dead" _after_ I type in the
> > > > password.  My .profile runs on the remote machine, and then I get
> > > > disconnected.  Very frustrating.
> > > >
> > > > Why does it work if I dont run X?
> > > >
> > > > I would like to test connecting to an ssh server with ssh -D. But
> > > > I can't where I am running this.
> > > >
> > > > Noone else has come across this problem?
> > > >
> > > > uh, again - I am not a subscriber to the list, so please mail me
> > > > if you think you know whats going on here.
> > > >
> > > > /jay.
> > > >
> > > > On Sun, 20 Oct 2002, Igor Pechtchanski wrote:
> > > >
> > > > > On Sun, 20 Oct 2002, Jacob A wrote:
> > > > >
> > > > > > Hey there,
> > > > > >
> > > > > > I have a real weird problem with running the openssh client
> > > > > > under X. When I connect to another machine via ssh, it prompts
> > > > > > me for the password, and then the session is terminated just
> > > > > > after I am logged in.
> > > > > >
> > > > > > unfortunately, I dont have root access on the machine I want
> > > > > > to ssh to, so I cant start sshd with -D there.
> > > > > >
> > > > > > It works perfectly when I do it without starting X.
> > > > > >
> > > > > > Anyone else come across this problem?
> > > > > >
> > > > > > I'm not a subscriber to the list, so please reply to me as
> > > > > > well as the list if you have any input.
> > > > > >
> > > > > > /jay.
> > > > >
> > > > > Jay,
> > > > >
> > > > > I assume you want X forwarding when you're running X.  If not,
> > > > > just turning it off might do the trick.
> > > > >
> > > > > Does OpenSSH work if you don't run X but set DISPLAY in your
> > > > > system control panel? Does OpenSSH have a -v flag or a verbose
> > > > > option?  If so, it might help. If not, does cygwin's 'ssh -X'
> > > > > work (with and without DISPLAY set)? If you can reproduce the
> > > > > problem with cygwin's ssh, use the -v option for some additional
> > > > > debug info.
> > > > >
> > > > > The following might also be an instructive read:
> > > > > http://cygwin.com/ml/cygwin-xfree/2002-10/msg00065.html
> > > > >       Igor

-- 
				http://cs.nyu.edu/~pechtcha/
      |\      _,,,---,,_		pechtcha AT cs DOT nyu DOT edu
ZZZzz /,`.-'`'    -.  ;-;;,_		igor AT watson DOT ibm DOT com
     |,4-  ) )-,_. ,\ (  `'-'		Igor Pechtchanski
    '---''(_/--'  `-'\_) fL	a.k.a JaguaR-R-R-r-r-r-.-.-.  Meow!

"Water molecules expand as they grow warmer" (C) Popular Science, Oct'02, p.51


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