FTP downloads with firewall on

For what it's worth to other users --
I had a problem downloading an update via FTP wth the Firewall turned on. I discovered the following note in the Firewall Preferences window:
"To use FTP to retrieve files while the firewall is on, enable passive FTP mode using the Proxies tab in Network Preferences."

The difference between the clients you use (Safari,Fetch,Transmit,Terminal,...) will be whether they are using PASSIVE mode by default. Not all of those clients use the flag that is set in Network Preferences.
For reference on why you need PASSIVE mode when the firewall is on have a look at http://slacksite.com/other/ftp.html
But the essence is that with the firewall turned on you have to tell the FTP server to be "passive" and let your client program create the connection. The firewall will generally be configured to allow the outgoing connection but to block an incoming connection request that happens if the server is communicating in "active" mode.
Graham

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