It is possible to install ArcGIS Enterprise on a server (named "A") inside a LAN, install the web adaptor on a public-facing web server (named "WebServer"), and reach ArcGIS services using https://example.com/arcgis.
Is it possible to install Portal in a similar manner such that the server running Portal is not directly reachable?
I saw a lot of documentation about how the Web Adaptor for Portal requires a fully qualified domain name but that doesn't exist for servers that aren't public-facing.
For instance, http://www.esri.com/videos/watch?videoid=3640&isLegacy=true&title=configuring-arcgis-web-adaptor-with-portal-for-ArcGIS shows a Portal URL of https://husker.esri.com:7443 at the 07:42 mark. Does that mean that if I typed https://husker.esri.com:7443 into my browser's address bar, I would see the default Portal home page and my network traffic would start bouncing around ESRI's internal network?