Another person on this list was having a similar problem with his/her own machine. If you're using the regular ftp client, you might try these steps first.
ftp> open <whatever> ftp> username: <etc> ftp> password: <etc> Then: ftp> debug ftp> passive Seems the ftp client doesn't necessarily default to passive mode, though many set-ups, with firewalls or such, only work in passive mode. That may be all you need to do.