Hello all,
I have an FTP server I just set up for my company with a plethora of usernames and passwords for access using a D-Link NAS device in RAID 1. I can get the exact model if need be.

When one of the clients, using Windows Vista, attempts to access the FTP, he receieves the aforementioned error. I have no idea what this means and google isn't telling me much. Does anyone have a clue?