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Thanks for all your replies. The fix works as expected. In addition, the entire thread answered a lot of questions I had around using GeoRSS for displaying a customized layer on top of a Base Map.
The only way to use the KML and GeoRSS layers will be through this hard-coded online service
Even people who have their own purchased installation of Portal won't be able to point the layers at it
Our KMLLayer and GeoRSSLayer are not the only way, but they're the simplest, most straightforward way and it's what we recommend.
No, I said the opposite of that: if you purchase Portal, it includes these services and you do not need to use the KML and GeoRSS utility services hosted by Esri as you will have your own services running on your intranet.
I should have been more specific earlier, I'll try again:
If we do have a local Portal install how do we point the JS API at it? (so that the KML and GeoRSS layers use it, which settings do we change?)
Good point. We'll likely end up doc'ing these config settings.