Just installed a Windows 2008 Web Server using IIS 7.5.
Initially I set the site FTP settings to require SSL and all FTP sites I added had require SSL. Then 1 client found they couldn't handle SSL with FTP so I went to their site and set SSL to optional.
However when I try and connect to that FTP site it still gives the error "Policy Requires SSL". I can't see what else to change.