If you install Portal for ArcGIS on the forward facing web server, do you still have to install the web adaptor for portal on the web server. I understand that the web adaptor forwards the requests to the Portal when Portal is behind the firewall. The documentation says you must install the web adaptor here.
ArcGIS Web Adaptor -ArcGIS Web Adaptor is a required component of Portal for ArcGIS, which allows you to integrate your portal with your existing web server and your organization's security mechanisms. You cannot deploy Portal for ArcGIS in your organization without the Web Adaptor.