Pfsense Passive ftp with ftpproxyhelper

[keropiko]

Hello everyone.

I have installed pfsense 2.1 to an old p4 pc and everything is working great. A big big thank you to the developers and everyone for this great firewall.
I have read many and many posts regarding the pfsense and ftp various problems during configurations ecc. but have not yet found an answer to my problem.
I have an ftp server behind pfsense. When i port forward port 21 redirected to port 21 of the lan address of the ftp server, ftp helper works okay and i can connect to my server with passive mode correctly with any ftp client.
When instead of port 21, i redirect another port mainly for not opening a common port to outside, like 52382 to port 21 of the lan address of the ftp server, then i have the problem that i cannot connect getting the error "Server sent passive reply with unroutable address. Using server address instead". It's like ftp helper is working only when forwarding port 21 without redirection from another port.

Is there anything i can do to solve this?

Thank you for any answer, and Best wishes for Happy and Merry Christmas to all.

Bye.