Just a question. Have you opened the data ports. I had the same issue, until i allowed ports 49152 through 65535 on the router.
I setup a certificate, and then assigned AD accounts to the certificate. That got authentication going, in ssl as well, but until i opened those ports, using fireftp to acess the connection, i couldn't see the actual data.
Probably not that helpful, but its worth a try. Here is my post i made, and now its all working.
http://forums.iis.net/t/1149712.aspx