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A minmal iptables ruleset for a high volume Nginx reverse proxy (or: how to use NOTRACK for http and https)?

I'm looking for a minimal iptables ruleset for a rather high volume Nginx/Varnish reverse proxy. I'd like to close down the server, so that only ports 80 and 22 are open at all for connections from ...
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iptables/netfilter (nf_ct_ftp) drops ftp packets

I have a strange problem. netfilter (the module nf_ct_ftp) drops packet from one of my ftp client. But it happens only with this client (91.xxx.xxx.170), all others clients (about 100) are working ...