IIS6 - How to restrict users between two FTP sites on the same machine?

view full story

http://serverfault.com – On a Server 2003 machine, I've installed IIS6 and FTP services. I've created two different FTP sites, each one is listening on a different network adapter (2 IP addresses). The machine is joined to a domain (another SBS server). Both sites are on the same physical directory, but one site is for client access (user isolation) and the other is for admin access (entire folder structure). The problem is, I can't figure out how to restrict users from logging into one or the other site. The one with user isolation should only allow login of users who are explicitly configured from this machine. Tha (HowTos)