Re: Openssh client under X

[Igor Pechtchanski <pechtcha@cs.nyu.edu>]

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@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.
>
> ----------------------------------------
> "what we do in life echoes in eternity."
>                - Maximus Decimus Meridus
>
> 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

-- 
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