> Are you sure that it doesn't block other ports anyway? A decent firewall may 
> block all the other ports to stop attempts at penetration of the company 
> site anyway.
>
>   

Afaict the big hole in most firewalls is port 443, it is used by https 
(http over ssl). Being an encrypted protocol there is not much they can 
do to monitor/cache it and few places dare to cut it off. They could 
throttle it or do traffic analysis to look for non http like traffic I 
guess but I bet few places bother.
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