Thanks . but as i said before it is already disabled net.ipv4.tcp_syncookies=0 -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/possible-SYN-flooding-on-port-3128-Sending-cookies-tp2242687p3595942.html Sent from the Squid - Users mailing list archive at Nabble.com.