I've just completed a new installation of DNN and installed the skins and modules I've purchased. I also imported a template to begin working off of. I'm trying to give access to people within our organization to access the site to begin working on it (internal network access only), but when we try to access the server (http://web01/internal_site/) we get the following:

HTTP/1.1 200 OK
Server: Microsoft-IIS/7.5
Date: Tue, 27 Oct 2015 13:38:40 GMT
Connection: close

Is the problem with the default page? I shouldn't have to set it in IIS, right?

Web01 does resolve to the webserver. I'm not sure what you mean by binding to the host header. Is this something I have to do in IIS? The dnn install doesn't seem to have set any specific default documents in IIS, which I would have expected.

I'm accessing it directly on the server itself (using localhost). I was simply substituting the server name (or IP address) for localhost, but that doesn't seem to work.