Exploring the Mac OS X Firewall
Subject:   How about opening a single nonstandard port
Date:   2006-10-11 17:42:47
From:   TomEM
I suspect my problem is pretty common. My ISP blocks Port 80 so I'm using another port for http traffic, specifying that in the URL. To run the firewall, I need to open up that extra port. Isn't there some easy to simply add another line to the rules in the part where the services are opened up? Or do I have to completely override the system preferences.

Thanks for any help. It makes a difference between running and not running the firewall...