Let me see if I understand your question. You want the requests that are received via site.ourdomain.com to be routed to site.hosteddomain.com without changing the URL on the client browser, is that right? If so, all you need to do is to configure ARR as a reverse proxy. The UI for this configure differs...

No problems. I think I understood you fully, but I wanted to repeat it to ensure that I do. You are using ARR in a hybrid mode. Meaning, it is both a proxy (for savitarbernese.sytes.net) and for all others, it is a content server. For requests with hostname savitarbernese.sytes.net, you want them to...