Fedora 10 and Asterisk GUI

I have the Asterisk GUI running on the Fedora 10 OS.
The GUI works:
On the local machine if I use the local host name

 [b]The GUI does NOT work:[/b]
      If I use the IP address on the local Asterisk machine
      If I try to use the Asterisk's IP on another machine, on the same lan
      If I try to use the Asterisk's Hostname on another machine, on the same lan

Is there some setting that is preventing the GUI from working?

Thanks in advance,
Mike