Short question
How can I configure the port to be used by SharePoint when accessing the app domain/app web?
Details
I want to configure a non-default SSL port for my app URLs:
You see how SharePoint doesn't let me do it (in this dialog).
I want to use a non-default SSL port for my app web, so any non-443 port.
Background
In a test scenario I need to do something like this ("Running Multiple SharePoint SSL Websites on Separate SSL Certificates Using Server Name Indication"), but without SNI since I'm on IIS 7.5. On the same IIS site I want to configure different bindings for the SharePoint portal and the app web using two different certificates:
Only one of the bindings can use port 443 - that shall be my portal, reachable by end users. Now how to configure the wildcard binding for the app web to use another port?
Currently calls to my apps try to access the app web URL at port 443: "https://apps-de4f1d871b8e93.apps.demo.local/sites/" I want that to be like this: "https://apps-de4f1d871b8e93.apps.demo.local:444/sites/"
Note: I already added the app domain as app-specific alternate access mapping like this:
New-SPWebApplicationAppDomain –AppDomain “apps.demo.local” –port 444 -SecureSocketsLayer –WebApplication https://portal.demo.local
What else is necessary to get SharePoint call the app web on port 444?
Note: this question is explicitly about this configuration. I know there are alternative ways to achieve similar goals, but I want to know if this configuration can work.