I've created an Azure Web App that sits behind an Application as well as a private endpoint. The idea being that to access the app, you must go through the Application Gateway and cannot access it through the webapp.azurewebsites.net url. The tutorial I followed was here: https://www.fearofoblivion.com/Securing-Azure-Web-Apps-using-Application-Gateways-and-vNets
The diagram of how it all looks is this:
Everything works as expected. The site cannot be accessed through azurewebsites.net and can only be accessed through the public IP of the Application gateway.
The problem is when trying to add an SSL certificate. If I add an SSL certificate to the WebApp I must verify the domain by adding a CNAME record to point to the azurewebsites.net domain with the IP of the WebApp. If I do that it allows public access back to the WebApp through Azurewebsites.net.
How do I add an SSL for my WebApp without losing the security of a private endpoint?
