According to www.PortsDB.org (which I have always used for identifying exotic ports), Kazaa typically uses Port 1214..... Hope this helps Scott B. DeVries DrFizzix@xxxxxxxxxxxx >>>> Artur Sampaio" <artursampaio@xxxxxxxxxxxx> >>>> 1) Yeah. The Internet traffic (with a pppoe ISP) pass through my linux server (making nat with iptables). But what the port i need to block?