My cookies lose their magic :-(

[Sam Varshavchik <mrsam@xxxxxxxxxxxxxxx>]

When in an ssh connection from an FC3 box to an FC2 box, after a short time 
I suddenly begin getting these:

$ emacs foo
Xlib: connection to "localhost:11.0" refused by server
Xlib: Invalid MIT-MAGIC-COOKIE-1 key

I must log out, then log back in with ssh, and X11 forwarding works again, 
but only for a limited time.  I haven't yet measured how long my magic 
lasts, but after a while attempts to start new X clients begin to fail 
again, and I must log out and relogin.

This started happening after I upgraded the first box from FC2 to FC3.  When 
I was ssh-ing from FC2 to FC2 everything was working.

WTF?

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