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Date: Tue, 12 Jul 2011 07:10:10 -0700
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Cc: freebsd-questions@freebsd.org
Subject: Solved: Re: ssh -X (X11 forwarding) not working from 6.1 to 8.1
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Mark Felder <feld@feld.me> wrote:

> On Tue, 12 Jul 2011 00:06:33 -0500, Michael Sierchio <kudzu@tenebras.com>
> wrote:
>
> > xauth not in your path?
>
> ssh -Y skips all auth stuff so you don't need xauth; he said that
> didn't work either :-(

Well, apparently, even -Y needs xauth (which was not installed on
the 8.1 system) on the ssh server -- although not on the ssh client.
After installing it:

  $ ssh -Y fbsd81 'echo DISPLAY=%$DISPLAY%'
  /usr/local/bin/xauth:  creating new authority file /home/perryh/.Xauthority
  DISPLAY=%localhost:10.0%

and -X also works :) so this turns out to have been the solution.

Next question:  shouldn't I have gotten some kind of error message
when attempting "ssh -X" or "ssh -Y" when xauth wasn't available?