after my site was attacked I installed CSF v14.05 and it work great.Except that users with ipv6 started getting (connection time out) and very slow browsing to my site. if I disable CSF the problem goes away.
here is my setting in CSF for ipv6:
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IPV6 = OFF IPV6_ICMP_STRICT = OFF IPV6_SPI = OFF Allow incoming IPv6 TCP ports: 20,21,22,25,53,80,110,143,443,465,587,993,995,2077,2078,2082,2083,2086,2087,2095,2096,8443,2052 Allow outgoing IPv6 TCP ports 20,21,22,25,37,43,53,80,110,113,443,587,873,993,995,2086,2087,2089,2703,2052 Allow incoming IPv6 UDP ports 20,21,53,80,443,2052 Allow outgoing IPv6 UDP ports 20,21,53,113,123,873,6277,24441,2052