Aplica essas linhas aeee e ve eu bloquei aqui na empresa e funciona .. numa boa ..


#Bloqueios de MSN
CHATPORT="1863,5190"
/sbin/iptables -I INPUT -p tcp -m multiport --dport ${CHATPORT} -j DROP
/sbin/iptables -A FORWARD -p tcp -m multiport --dport ${CHATPORT} -j DROP
/sbin/iptables -A FORWARD -p tcp -s 192.168.7.0/0 -d 207.46.110.0/24 -j DROP
/sbin/iptables -A FORWARD -p tcp -s 192.168.7.0/0 -d 207.46.104.0/24 -j DROP
/sbin/iptables -A FORWARD -p tcp -s 192.168.7.0/0 -d 64.4.13.0/24 -j DROP
/sbin/iptables -A FORWARD -p tcp --dport 1863 -j REJECT --reject-with tcp-reset
/sbin/iptables -t mangle -A PREROUTING -p tcp --dport 1863 -j DROP
/sbin/iptables -t mangle -A PREROUTING -d 63.208.13.126 -j DROP
/sbin/iptables -t mangle -A PREROUTING -d 64.4.12.200 -j DROP
/sbin/iptables -t mangle -A PREROUTING -d 64.4.12.201 -j DROP
/sbin/iptables -t mangle -A PREROUTING -d 65.54.131.249 -j DROP
/sbin/iptables -t mangle -A PREROUTING -d 65.54.194.118 -j DROP
/sbin/iptables -t mangle -A PREROUTING -d 65.54.211.61 -j DROP
/sbin/iptables -t mangle -A PREROUTING -d 207.46.104.20 -j DROP
/sbin/iptables -t mangle -A PREROUTING -d 207.46.110.2 -j DROP
/sbin/iptables -A FORWARD -d 64.4.13.0/24 -j REJECT