Portforwading and FTP

[Yuzz]

Hi,

I would like to seek some help from expert regarding on port forwarding and ftp.
i have setup the POSTROUTING and PREROUTING in iptables config to forward packet to ftp server. Then i try ftp client to access my ftp server. I successfully access my ftp server but i have error message come out 502: ILLEGAL port command. Anybody can help me how to solve this issue.
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