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I use Ulogd to log Trafic that pass over firewall. My Rule are in Forward Chain:

 chain FORWARD {
            type filter hook forward priority 0; policy drop;
            ct state established,related accept
            my rule with prefix_rule: x machine to ==> y machine
            log prefix "LOG__CHAIN" group 1

I wrote flag tcp in my rule, but I don't get any FIN with prefix_rule. But sometime I get FIN flag in log related to LOG__CHAIN.

I cant access the destination Host with ports: 80, 433, ssh .

I want to know how I can know the ende of the TCP-connection when using these ports

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