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How to block a specific protocol using iptables firewall? For example block Yahoo messenger?

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Well, in this case you probably want to block the ports Yahoo Messenger uses, not the protocol (which is TCP/UDP, used by almost everything else).

Based on this list, I would start with port 5050 outbound and perhaps add more:

sudo iptables -A OUTPUT -p tcp --dport 5050 -j DROP

Once you have a set of rules that you have determined is sufficient, don't forget to save them with iptables-save (or they will be lost upon reboot).

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it didn't work :/ – alsadi90 Jul 29 '12 at 10:14
    
I didn't say it would, you need to find out which ports are being used right now, and if there isn't a current list, use something like Wireshark. It's complicated, sorry... – izx Jul 29 '12 at 10:15

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