This is required for Visual SourceSafe to work.
I need to know what ports need to be open to the outside, so Windows file sharing can respond to users in the public internet. Users need to be prompted for domain credentials when they try to connect, of course.
Someone should be able to type
\\MY-PUBLIC-IP\ and get prompted for domain credentials, after which a list of the available shares on my server would be displayed. Furthermore, public users should be able to type
\\MY-PUBLIC-IP\HiddenShare$\ to get to shared folders that are hidden from the public directory.