Dear All, I am new to linux. I want to disable chat with iptables so that nobody can use chat with mIRC with LAN. Because every students are chatting all the time. I am using Red Hat 9 and Squid. They use port 443 and 6667 to chat with mIRC How can I write firewall rules. Any help is appreciated Myanmar Linux Boy -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list