My portal is configured behind a firewall in a three-tier arrangement, without open internet access. However, we can request access to specific hosts/URLs, and I'd like to know if there is a list of URLs for basemaps, etc. and any other external resources used by portal. Otherwise, I'll be forced to configure for a disconnected portal and offline basemaps.
Does such a list exist?
Whether or not a list exists, is it safe to say that only Portal will require access to external content (not Arcgis server, datastore, etc.)?