Re: iptables ip_conntrack_ftp + proftpd TLS: PORT command not understood

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Filippo Zeus wrote:
Considering ftp-control port is text based i've dumped with -A switch. I hope it's ok

03:05:59.149005 IP ***HIDDEN_IP***.21 > 151.80.2.63.55194: P 1:71(70) ack 1 win 46 2.P.?......L.1...P....`..220 FTP Server ready. Please use FTP-TLS or login wi 03:05:59.149078 IP 151.80.2.63.55194 > ***HIDDEN_IP***.21: . ack 71 win 1024
2....1.....M.P.......+
03:05:59.149759 IP 151.80.2.63.55194 > ***HIDDEN_IP***.21: P 1:11(10) ack 71 win 1024
2....1.....M.P.......AUTH TLS

03:05:59.700919 IP ***HIDDEN_IP***.21 > 151.80.2.63.55194: . ack 11 win 46
2.P.?......M.1...P.......
03:05:59.700939 IP ***HIDDEN_IP***.21 > 151.80.2.63.55194: P 71:96(25) ack 11 win 46
2.P.?......M.1...P...O...234 AUTH TLS successful

03:05:59.701036 IP 151.80.2.63.55194 > ***HIDDEN_IP***.21: . ack 96 win 1024
2....1.....M4P.......+
03:05:59.706276 IP 151.80.2.63.55194 > ***HIDDEN_IP***.21: P 11:95(84) ack 96 win 1024
2....1.....M4P...L.......O...K..H;^w.i} ..\*.+....'b..]...5`.O....$.3.E.9
03:06:00.416441 IP ***HIDDEN_IP***.21 > 151.80.2.63.55194: P 1516:1666(150) ack 95 win 46 2.P.?......R.1...P....[...)E..5O......tsp.+).)..W[H..u.)IP..&....XZr...~.<...


Its a bit hard to read, but this looks like your client also
encrypts the control connection, which explains why FTP
conntrack doesn't work.

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