Windows Server 2003, IIS 6 – Host Name/Host Header – Can't Access Admin/WP Site

Hello, new to WordPress and I’m having trouble setting it up on my server.

I’m running Windows Server 2003 with IIS 6 on a Dell PowerEdge. I plan on using one IP address to host multiple sites. I am already running one site on the server created in Microsoft Expression Web and uploaded via webDAV. I have Administrator access.

I want to use IIS’s Host Header ability to host multiple sites.

To install WordPress, I used Microsoft Web Platform Installer 3.0 guide.

Here is the info I entered in the “Enter your site information” screen.
Note: Replacing my personal domain details with “example”.
Web Site: New Web Site
‘WordPress’ application name: ex
Web Site Name: Example Inc.
Physical path: C:\inetput\example
IP address: All Unassigned
Port: 80
Host Name: https://www.example.net

In the “Enter application information” screen, I followed the guide’s instructions.

After clicking “Finish” on MS Web PI 3.0. I opened Internet Explorer and entered https://localhost/ex to complete installation and WordPress configuration. I could not access the application.

I thought because I had entered my domain URL in Host Name field I was not able to access localhost. So I went to https://www.example.net/ex
No luck there either. I just got the Network Solutions Under Construction page.

I gathered from the guide to leave the Host Name field empty so it would go to localhost. But I was reading another guide that wrote:

Host Name : Enter a host name if you are differentiating by host headers.

I retried following the aforementioned guide but this time keeping everything same in “site information” screen except in the ‘WordPress’ application name: field. I just kept the default / per instructions:

The slash indicates the root of the website you are about to create.This can be left at default here since the application is already isolated by a different website.

Tried opening WordPress configuration via localhost and URL, failed again.

Tried again with the intention of following WordPress’s IIS guide to the letter and leaving the Host Name: field blank. This time, I could access WordPress configuration via localhost. However I did not proceed further because when I went to verify site creation in IIS Manager I found that the site was not assigned a Host Header.

So long story short, my question is,
Because I want to run more than one website using one IP, and the only way I can do that is through IIS Host Headers, how does one assign a Host Header to a WordPress site and still access the admin/config panel?

Thank you for your help.

P.S. I never saw the screen or the fields for “generate four unique keys”. Does that mean that is unnecessary for the installation?
I saw on another article that those could be later entered in the wp-config.php file. But do I need to?