What do people consider to be ports that are essential for web access? Obviously ports 80 and 8080 but anythign else? I ask becuase a couple of my housemates are downloading huge files off the net all the time taking up all the bandwidth!!! and my router (which i admin ) has the ability to block port ranges at certain times of day. So basically I want them to have e-mail, msn, irc, ftp and net access. Anything else? and which ports?