Re: ssh X11forwarding won't work, please help
From: Dances With Crows (danSPANceswitTRAPhcrows_at_usa.net)
Date: 08/02/04
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Date: 2 Aug 2004 19:30:54 GMT
On Mon, 02 Aug 2004 19:04:34 GMT, Wayne Throop staggered into the Black
Sun and said:
>> Nils Gorges <noctamid@gmx.de>
>>> But anyways, you mean you are setting DISPLAY to machine1:0 and
>>> launching an X app on machine3, right? And "nothing happens"? The
>>> X app doesn't say something like "can't open display" "not
>>> authorized" or somesuch? Are there any error indications at all?
>> yes exactly, no error messages, nowhere.
Seems a little strange. But read on...
> Then it's probably not an access or networking problem. The bad news
> is, that's strange enough that I can't think of anything to suggest.
>> But now ssh -X sets the DISPLAY variable. There are now firewall
>> rules and the X Server at machine1 is listening for TCP connections.
>> But this isn't even necessary if you use ssh -X or am I wrong?
> Right, ssh -X will bypass both firewalls and even connect to X servers
> that are only listening for local processes with no tcp connections.
> It does this by the ssh server process operating as a local X process
> on the same machine as the X clients, and the ssh client process operating
> as a local X process on the same machine as the X server, and both
> the X server and the X client being unaware that any traffic is going
> to a remote location.
FWIW, I had similar problems on Gentoo machines running recent sshd and
X releases. Like so:
machine1:~$ ssh -X machine2
machine2:~$ xeyes &
(cannot open display localhost:10.0)
...however,
machine1:~$ ssh -Y machine2
machine2:~$ xeyes &
(works)
The -Y option to ssh allows "trusted X11 forwarding", which apparently
does something -X doesn't. I don't really have time to research
specifics right now, maybe later on tonight, but maybe this'll help you
out.
-- Matt G|There is no Darkness in Eternity/But only Light too dim for us to see Brainbench MVP for Linux Admin / mail: TRAP + SPAN don't belong http://www.brainbench.com / Hire me! -----------------------------/ http://crow202.dyndns.org/~mhgraham/resume
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