I have an existing site at my.site.com and I would like to setup a staging subdomain (staging.my.site.com). I have my DNS setup and directing staging.my.site.com to my server, but for some reason the Web Site I created in IIS for it is not being hit. Instead when I go to staging.my.site.com it takes me to the original site.

The site I created in IIS has a home directory that is totally different from the regular sites home directory. I have added one host header with the following information:

IP Address: (All Unassigned)
TCP port: 80
Host Header Value: staging.my.site.com

I was under the impression that with the setup I described above hitting staging.my.site.com through a web browser would bring up the staging site, but it does not. Can anyone see what I am doing wrong?

UPDATE:

One thing I noticed is that in my A record I am mapping to the IP Address ( lets say 1.1.1.1 for this example). In the host headers for the main site (my.site.com) it has 1.1.1.1 as an entry. Is this normal? Could it cause the problem I am talking about?