I need to open port 80 manually to use with Vuze tracker but it is closed in OS X Leopard as well as in Mountain Lion. The tracker works on other ports. Everything is configured correctly and the same tracker works on Windows XP on port 80. The problem is with OS X and I dont know how to open that port manually. Apache works on port 80 in its own directory. The port is currently closed, firewall disabled, direct connected to internet with no router. I've read a little about Linux users being able to edit iptables but I dont have instructions what to do on OS X. Any help much appreciated.