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From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: Ftplib.FTP_TLS Ports
Date: Tue, 09 Dec 2014 23:37:58 -0500
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On Tue, 9 Dec 2014 20:13:40 -0800, Eric <seag33k@gmail.com> declaimed the
following:

>We are trying to open our firewall but it keeps failing.  The docs state
>that the default port is 21 and we've opened port 21.  I've ran tcpdump on
>the box while running the script.  I see a destination port of 21, but
>there seems to be random destination ports such as 2320 which follow.  If
>we open the firewall to allow all traffic, the script works.  Here is a
>snip of what I have for the ftp portion.  Any ideas would be helpful.
>
	Are you running in PASSIVE mode?

	Original (normal?) FTP uses the known numbered port as a control port,
and gets a second port for the data itself (without looking up the RFC I
can't state if said second port is opened by the server in response to the
client connect, or is provided to the server by the client).

	Passive mode, as I understand it, basically means the control port is
used for everything -- it explicitly is used to get through firewalls.

-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
    wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/