I am using CoreFTP lite to connect to my FTP server in passive mode and I get something like (I am not behind a firewall):
Connect socket #660 to 188.8.131.52, port 21...
220 ProFTPD 1.2.10 Server (ProFTPD) [184.108.40.206]
331 Password required for ftpuser.
230 User ftpuser logged in.
215 UNIX Type: L8
Keep alive off...
257 "/" is current directory.
227 Entering Passive Mode (66,117,23,50,238,146).
Connect socket #652 to 220.127.116.11, port 61074...
(P.S. Real IP is not being used)
However unchecking passive mode in FTP client allows FTP connections *AND* passive mode connections over SFTP (port 22) do work !
Issue is: I need to enable passive connections over plain FTP (port 21), because I am using a backup script that only works in passive mode.