This should work for you
 
iptables -I FORWARD -i eth1 -p tcp -m string --string "KazaaClient" -j REJECT --reject-with tcp-reset
 
hare
----- Original Message -----
From: Joćo
To: netfilter@lists.netfilter.org
Sent: Monday, March 17, 2003 2:10 AM
Subject: Kazza

Can you give me ana example how to block kazaa