Invisible port 80

[Robin Becker]

I am in the process of setting up a pair of freebsd 6.0 servers with 
different hosting services. On one of the servers I cannot seem to 
access the apache server which I have started. I can access port 80 on 
the machine itself using the machine IP address, but from my office port 
80 seems invisible. The other machine works exactly as expected.

Can anyone suggest something simple that may be causing this? So far I 
have only been using ssh to communicate with the machine so perhaps 
have neglected some network setting etc etc.
-- 
Robin Becker