Cannot connect to ftp server

We have three MBPs in an external office connecting via internet to our main FTP server in another office. One connects perfectly via the GO > Connect to server > address > user and password login. The server mounts on the desktop as it should. The other two cannot. The process skips the > user and password login phase and they connect as guests with no access. If you click on the Disconnect button then the Connect As flashes for a microsecond and disappears.
They all connect perfectly with the Firefox Fire FTP. It appears that the OS has memorised some setting and and uses that setting for their connection through the GO> Connect to server window. How would you fix that?
Thank you very much
antonio

Port 21 is the control port. You also need to open the data port. Given typical modern network configurations with two firewalls (on the client network and on the server network), both active and passive transfers can be blocked, too.
Here's some stuff that describes the general sequence and some of the risks: [Configuring FTP Services On Mac OS X|http://labs.hoffmanlabs.com/node/942] and [Why You Don't Want FTP; Firewalls And Ephemeral Ports|http://labs.hoffmanlabs.com/node/530]
It's vastly easier to use sftp. Open port 22, and Bob's Your Uncle; you're done. And you're also not showing off your username and password to everybody in the coffee shop (unlike ftp), and you can choose to set up a no-password or a passphrase-based login using certificates.

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