X11 forwarding problems in FreeBSD 6.2 - no xauth data? [SOLVED]

Pollywog lists-fbsd at shadypond.com
Thu Jul 12 01:47:19 UTC 2007

On Wednesday 11 July 2007 23:17:42 Albert Shih wrote:
>  Le 10/07/2007 à 14:41:01-0700, Pollywog a écrit
> > On Sunday 08 July 2007 18:03:49 Pollywog wrote:
> > > I am having some problems with X11 forwarding. I can do X11 forwarding
> > > via ssh between two machines running Linux, but if I try to do this
> > > from FreeBSD (KDE) to either of the Linux machines, it only works if I
> > > use startx to start KDE on the fbsd machine (a laptop). If I start KDE
> > > from kdm, I get errors that go like this when I start the KDE app on
> > > the remote host running Linux: pollywog at slider:~$ kate
> > >  Xlib: connection to "localhost:11.0" refused by server
> > >  Xlib: Invalid MIT-MAGIC-COOKIE-1 key
> > >  kate: cannot connect to X server localhost:11.0
> >
> > I just did 'ssh' to one of the Linux hosts and when the connection was
> > made, I got this:
> >
> > Warning: No xauth data; using fake authentication data for X11
> > forwarding.
> >
> > Does this possibly have something to do with the problem I mentioned in
> > my initial post in this thread?  I am going to Google that error and see
> > if I can find something.
> Check where is the xauth app on the Linux box, and make
> 	strings sshd|grep xauth
> to check if it's the same path.
> If don't you need to fix this with
> 	XAuthLocation
> in your sshd_config file on the Linux box

I tried that and it did not solve the problem, but you gave me an idea and it 

I put 'XAuthLocation <pathto_xauth>' in my ~/.ssh/config on the FreeBSD box 
and that fixed the problem for both Linux boxes; I can connect to either of 
them and run X apps.

I believe that if I do the same thing on each of the Linux boxes, I should be 
able to connect to the FreeBSD host and run X apps.

Also, instead of each user having to do the above modification, I will 
put 'XAuthLocation' in /etc/ssh/ssh_config (instead of sshd_config) globally 
and that should take care of this issue.

thank you for your help

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