cyberduck will abort connection to an ftp server if it doesn't know the SYST command, which is frequently disabled, and not necessary for proper operation. Here's a log from ftp://dl.free.fr (a server used to file exchange on the french ISP Free.fr) :
220 hadl10G-1 FTP server (Version 0.1 - 2007/06/11 00:49) ready.
500 'FEAT': command unrecognized.
331 User name okay, need password..
230 Utilisateur anonyme loggue
257 "/" is current directory.
500 Commande inconnue
I had been using cyberduck to upload files there until recently, I believe it broke after version 4.x.
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