You may also have to block the ports with which yahoo messenger and/or msn messenger connects to. You can do this by using iptables to drop the packets that are meant to establish connection.
I haven't tested this yet (just got this through googling ... try it sometimes might help), but you may check out the following:
# iptables -A FORWARD -p tcp --dport 1863 -j DROP
# iptables -A FORWARD -p TCP --dport 5000:5010 -j REJECT
# iptables -A FORWARD -d cs.yahoo.com -j REJECT
# iptables -A FORWARD -d scsa.yahoo.com -j REJECT
--
"C makes it easy to shoot yourself in the foot; C++ makes it harder, but when you do, it blows away your whole leg."
- Bjarne Stroustrup (from Good Quotations compiled by Dr. Gabriel Robins)
Renz
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