A related problem: when I do ssh -X to my SL box.
And from there I try to start xterm -- I've got an error:

xterm Xt error: Can't open display
xterm: DISPLAY is not set

Any idea how to fix it?

About a month and half ago I had similar problem on Solaris 10: 
downgrading patches from 126133-03 to 126133-02 fixed it.
But if I'll install older rpm on SL -- next day it would be auto-updated.

Cheers
Alex
Stephen John Smoogen wrote, On 08/28/2008 02:38 AM:
> 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
>>
>>     
>
>
>
>