http://blog.armgasys.com/?p=80

IIS 7 supports what appears to be an undocumented feature for SSL and Host Headers.  You simply preface the SSL certificate’s friendly name with an asterisk.

Assumptions

• You have a valid SSL certificate already installed on your IIS server
• The SSL certificate matches your sub-domain URL
• You have access to the IIS Manager

Instructions

1. Open Internet Information Services (IIS) Manager
2. Edit the Site Bindings for the website you which to assign an SSL certificate to
   (right click, select Edit Bindings
3. Select the HTTPS port and select Edit
4. Note that the Host Name (Host Header) field is unavailable for editing

   

5. Launch the Microsoft Management Console (MMC)
   1. Select Start –> Run
   2. Type in “MMC” and hit enter
   3. From the console, select File –> Add / Remove Snap-in
   4. Select Certificates from the Add / Remove dialog
   5. Select Computer Account when prompt for which certificates the snap-in will manager.
   6. Select Local Computer when prompted
   7. Click OK to add the Snap-in to the MMC
6. Locate your SSL certificate
   1. For self-signed (SELFSSL), look in Personal
   2. For installed / purchased, look in the appropriate folder the certificate was originally installed in
7. Right click on the certificate and select properties
8. Edit the Friendly Name field so the name starts with an * (asterix)

   
    

9. Repeat steps #1 – 3 above
   Note that the Host Name (Host Header) field is now available for editing