FTP Servers

See also:

http://serverfault.com/questions/42396/prevent-brute-force-attacks-in-microsoft-ftp-server-iis6-7 Prevent brute force attacks in Microsoft FTP Server (IIS6/7). Script triggers on failed log in's, searchs log for all failed logins on account "Administrator" (or other account you KNOW you aren't going to use, but the crackers will) and blocks all those IP's.
http://technet.microsoft.com/en-us/library/cc753285(WS.10).aspx Isolated user mode alows one FTP site to provide access to many different users files, with each users files in a different directory, and the root folder for the ftp service set by the users login.