I've got 3 domains registered, with the DNS Management set up with the registrar for all 3. They all 3 point to the same server. I've got a domain setup with a 'www' Host (A) record and the site hosted on the local server. I'd like to get all 3 domains pointing to the same folder on my website (essentially making all 3 domains the same website).

domain1.com has a record in IIS6.0 & a Forward Lookup Zone Record with the 'www' and everything set up. In the IIS I've set up host headers for domain2.com & domain3.com with the same IP/Port as domain1.com. They are setup in the properties of domain1.com in the Advanced section. When I type in the URL for domains 2 & 3 it doesn't go anywhere, domain1 does work though. Can anyone help me with what I may have wrong in the host header for this?