Ah, good, that's useful information. It means the FTP server is either not running on that player, has crashed, or is somehow blocked. Did you look at the config.ini file as I suggested before?

OH HEY, here's something. Is the player, by any chance, in DC/CAR mode right now? By default, the HTTP/FTP servers do not run unless the player is in AC/HOME mode. Just noticed that when looking at the config file settings on the page linked above.

Edit: (Working on updating the FAQ entries about logo editing and FTP access now, to include that little tidbit about AC/DC settings.)