cannot forward X11

[Anthony Fox <ant@lonelyroad.org>]

Hello,

I have recently upgraded to XF4.0.2.  I cannot forward some remote
computers' DISPLAY to my local XServer.  For example, I have a FreeBSD
firewall for which I cannot forward the DISPLAY variable to the Debian
box.  I can forward local accounts, such as root, and run X11 apps.  I
can forward a remote linux ssh connection and run X11 apps.  It is
only the FreeBSD box that refuses to forward it's DISPLAY.  I have
been able to forward X11 displays from the BSD box to a RH6.2 linux
box at work.

>From the local box:
[ant@thedebianbox] ~ $ xhost +
access control disabled, clients can connect from any host

>From the BSD box:
[ant@bsdbox] ~ $ export DISPLAY=<thedebianbox>:0
[ant@bsdbox] ~ $ xload &
Error: Can't open display:  <thedebianbox>:0

Does anyone know what the problem is and what I can do?  

Thanks,
Anthony