But that is all ok like that, because of security.
In a secure installation you don’t want anybody to access those administration pages from outside of your network. Those pages shouldn’t be available through the internet at all. What you need to know is:
IIS serves webaccess to the public internet through port 80 (http) or 443(https), but Tomcat is there to serves IIS for the cfml applications. Port 8888 should always be blocked withhin the firewall for public access.
After understanding that, now you have to decide what you want to do with your administration pages:
Option 1: let the administrator accessible to the internet, exposing it to brute force, penetration attacs, etc (bad practice), or
Option 2: Block the admin sites from public access (good practice), so a brute force login isn’t possible. This last option is what the video explains how to do in Step 5. If you want to let the admin sites accessible, you have to undo the steps of the video with Step 5.
But: Port 8888 should always be blocked from public internet by firewall, and please verify if you have other ports than the necessary ones open to public.
What we usually do to access those sensitive administration pages is to tunnel it or access it locally by logging into your Windows OS and accessing the page through from there over port 8888.