modprobe nf_conntrack
modprobe xt_state

this will help you if: iptables -A INPUT -m state –state ESTABLISHED,RELATED -j ACCEPT says:

iptables: No chain/target/match by that name

I have found article http://serverfault.com/questions/608870/error-iptables-no-chain-target-match-by-that-name with no answer. So the answer is above.

if you will try load incorrectly module like this: “modprobe ipt_state” you will get error:

FATAL: Module ipt_state not found.