I actually just happened to read your other post mentioning the hub working through their cloud service and that's why I decided to mention this. Sorry I didn't end up mentioning it earlier.If I had known this back then, I would have kept the Hub.
I originally was in the same boat as you, had a smartlinc that died (apparently a lot of them are dying at about 1 year.) and SmartHome gave me a Hub as a replacement. Apparently when the hub first came out the hidden port wasn't available but the development community complained because other devices used it. So they re-enabled it. It's port 9761. It's kind of a backdoor to the internal PLM inside the Hub. So per Smarthome tech support, they are correct in that the Hub's HTTP works differently than the Smartlinc. But when using the TCP port 9761 it's exactly the same.
I realized that SmartHome tech support only knows what's printed in the manuals which isn't much. So when I have questions about a insteon device I go to the forums. The ISY forums have a lot of info and general searches usually find good forums for information.I contacted them