I just setup a new KnoppMyth box after having used MythTV on RH8-9 and FC2 for a long while now.  Everything seems fine except that I cannot get X11 tunneling over shh to work.  I've got the following in my /etc/ssh/ssh_config which should do the trick:

  Host *
    ForwardAgent yes
    ForwardX11 yes

[Note to the security conscious, I don't plan on running "ForwardX11 yes" in the global Hosts and will setup a profile for the machine that needs access.]

I've googled and poked and edited and ssh restarted to no avail.  When I ssh -X into the knoppmyth box, there is no DISPLAY variable set.  I am able to ssh -X to other boxes and run X11 apps, so I know the setup on the system i am connecting from is ok.

I checked the KnoppMyth forums and people there seem to be running X11/over ssh fine.  I've never really used Debian before so I don't know how much is different between KnoppMyth and Knoppix and regular Debian.

Any ideas on where to look?  Better google fodder?

-David