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Date: Mon, 3 Aug 2009 21:15:04 -0700 (PDT)
From: mcoughlin <michael DOT w DOT coughlin AT gmail DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: $DISPLAY variable empty after SSHing
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Well it is good to know that it is doable. 

My computer is running Windows Vista, the middle computer runs Red Hat 3,
and the work computer runs Red Hat 4.


Larry Hall (Cygwin) wrote:
> 
> 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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