Blocking yahoo messenger using IPTables

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hi all
 
i want to block yahoo & msn messenger using iptables.  I have successfully block msn messenger using iptbales with the following command:
 
iptables -A FORWARD -p TCP --dport 1863 -j REJECT
 
and also tried to block yahoo messenger using following commands:
 
iptables -A FORWARD -p TCP --dport 5000:5001 -j REJECT
iptables -A FORWARD -d cs.yahoo.com -j REJECT
iptables -A FORWARD -d scsa.yahoo.com -j REJECT
iptables -A FORWARD -d scsa.msg.yahoo.com -j REJECT
 
but UNSECCESSFULL
 
what should i have to do block yahoo messenger?


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ANTS Consultiing


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