> Hi, > Anyone can advice me how to block chikka chatting at firewall ? > thank in advance. What have you tried already? This post seems to allow Chikka. If that works then it shouldn't be too hard to rework the rule for iptables to block Chikka. http://lists.freebsd.org/pipermail/freebsd-net/2003-October/001578.html This list has a posting with hints about blocking Chikka servers: http://www.freelists.org/archives/isalist/02-2006/ To be short: use a packet sniffer to see where a Chikka clients connects to and block that. Grts, Rob
