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Date:	Mon, 03 Aug 2009 23:50:16 -0400
From:	"Larry Hall (Cygwin)" <reply-to-list-only-lh AT cygwin DOT com>
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To:	cygwin AT cygwin DOT com
Subject:	Re: $DISPLAY variable empty after SSHing
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On 08/03/2009 09:39 PM, mcoughlin wrote:
>
> This may be confusing because I have to SSH twice to reach the computer I
> work on.
>
> On my home computer, I begin by starting the X server. I run the command:
>
> bash-3.2$ echo $DISPLAY
> :0.0
>
> And so it seems to be working fine. I then do:
>
> ssh -X computer #2
>
> Warning: untrusted X11 forwarding setup failed: xauth key data not generated
> Warning: No xauth data; using fake authentication data for X11 forwarding.
>
> And that is returned.
>
> ssh -Y computer #2 returns no errors.
>
> When I do
> [mcoughlin AT lisa ~]$ echo $DISPLAY
> localhost:12.0
> is returned for logging in with either the -X or -Y method.
>
> When I finally log into my work computer with either the -X or -Y method,
> -bash-3.2$ echo $DISPLAY
>
> returns nothing. And so when I attempt to use octave to plot,
> octave:2>  plot(x)
>
> gnuplot: unable to open display ''
> gnuplot: X11 aborted.
>
> Obviously nothing happens.
>
> Can someone give me a clue?

Sounds like a configuration issue at the "work computer".  I don't have a
problem starting "xclock" from the final machine I "ssh -Y" into.  DISPLAY
on the ssh'd machines get set to "localhost:10.0" in my case.  If DISPLAY
isn't set to the same thing as it is on your "computer #2", I'd suspect the
configuration issue is there.  For me, my first computer is running Cygwin
1.7 (not significant when compared to 1.5 in this case I would suspect) on
XP.  The 2nd machine is running Fedora 8.  The 3rd machine is running
MythDora 10 (i.e. essentially Fedora 10).  No special configuration on any
of these.  Not sure if this helps much other than to indicate that this
can be made to work (and possibly localizing which machine is the likely
suspect.)

-- 
Larry Hall                              http://www.rfk.com
RFK Partners, Inc.                      (508) 893-9779 - RFK Office
216 Dalton Rd.                          (508) 893-9889 - FAX
Holliston, MA 01746

_____________________________________________________________________

A: Yes.
 > Q: Are you sure?
 >> A: Because it reverses the logical flow of conversation.
 >>> Q: Why is top posting annoying in email?

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