ssh and X11 problem

[stan]

I just built a new 7.1 machine, and when I ssh from a Linux box to it I get
the following errors:

usr/local/bin/xauth: (stdin):1:  bad display name "unix:10.0" in "remove"
command
/usr/local/bin/xauth: (stdin):2:  bad display name "unix:10.0" in "add"
command

And I cannit get ssh to foward the X protocol. Yes I have added 

ForwardX11 yes to /etc/ssh/ssh_config

What am I doing wrong?

-- 
One of the main causes of the fall of the roman empire was that, lacking
zero, they had no way to indicate successful termination of their C
programs.