Yes, in this case you have *two* connections, and so,
four ports. But you only care about the server-side
port numbers. In FTP, the ftp server acts first as
a server, but when a client requests information,
the server connects back to the client as a "client".

Other programs like peer-to-peer file-sharing programs
also have two sets of ports in the specifications.
That's because they also make connections as a client
and as a server.
You might see written in the settings: "client ports xxx - yyy".
That actually means "clients connect to me on my ports xxx - yyy".
It isn't the client-side port number at all being referred
to.

Anton.

> The  feature  you  request is only important in rare cases; one of
> this  is  if you are writing an FTP server and need to support the
> active mode, where the server connects to the client from port 20.
> 
> Regards,
>    Gabriele.

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