On Wed, Aug 27, 2008 at 10:31 AM, P. Larry Nelson <[log in to unmask]> wrote:
> We've run into a problem with ssh X11 forwarding, apparently since
> the 8/23/2008 yum update of openssh packages.
>
> In the very recent past we were able to 'ssh -X' from an SL 4.6 host
> to another SL 4.6 system, and from there do an 'ssh -X' to a third
> SL 4.6 system and have X11 traffic pipe its way back to the original
> host with no problems.
>
> Now, in the last few days, we find that the 'ssh -X' from first host
> to second works fine, but then an 'ssh -X' to the third results in:
>
> Warning: untrusted X11 forwarding setup failed: xauth key data not generated
> Warning: No xauth data; using fake authentication data for X11 forwarding.
>
> And firing up any X11 app on the third host fails with:
>
> X11 connection rejected because of wrong authentication.
> X connection to localhost:12.0 broken (explicit kill or server shutdown).
>

This actually sounds like the security fix is working. Does ssh -X -Y
do what you want?

Say hi to Andy at roadkill for me :).

> I've started googling for this, but thought I'd throw it out in case
> others are experiencing the same problem or maybe Troy/Connie have a
> thought or fix.
>
> Thanks!
> - Larry
> --
> P. Larry Nelson (217-244-9855) | Systems/Network Administrator
> 461 Loomis Lab                 | High Energy Physics Group
> 1110 W. Green St., Urbana, IL  | Physics Dept., Univ. of Ill.
> MailTo:[log in to unmask]        | http://www.roadkill.com/lnelson/
> -------------------------------------------------------------------
>  "Information without accountability is just noise."  - P.L. Nelson
>



-- 
Stephen J Smoogen. -- BSD/GNU/Linux
How far that little candle throws his beams! So shines a good deed
in a naughty world. = Shakespeare. "The Merchant of Venice"