Remember that ftp passes name and passwords in the clear. If I was on the same network as the server, it would be trivial to run a packet sniffer and pick off the names and passwords. FTP is insecure so you can be assured that someday, you will have an issue.
Please consider a move to a secure server like you find at http://www.openssh.org
I have an ftp server set up with windows 2000 server. Could someone tell me how I can see who has tried to authenticate and failed and who was successful and what time and so forth? Thanks