I'm clearly not understanding something.
I'm using an ISY-994.
I 'Enabled Internet Access' from the File menu. I checked my router's UPnP page and sure enough, the local IP address assigned to the ISY had an entry for the port, 443. Should sending my browser to http://octet1.octet2.octet3.octet4/ have produced some kind of display? All I get is that my browser can't establish a connection. The octets are those of my external IP address, assigned automatically by my ISP. Not the internal address assigned to the ISY by my router, which begins with 192.168
My ISP does not permit residential users to host webservers. Therefore it occurred to me that they might block inbound traffic on port 443. So, using the ISY's administrative console, I changed the port number to one that was greater than 2000. I checked the UPnP again and the new port was listed. Then I tried browsing to the same external address, this time with :port_number on the end (substituting the correct port number, of course).
I do understand that my ISP could reassign my IP address and that this is what dynamic DNS services help fix. But before I get into that, I figured I'd at least see if it was possible to see the device over the Internet. I did find a security manual, and since I'm not an internet security expert it was useless to me. As written, it presupposes a thorough understanding of Internet security rules. If I need to understand that to make your product work, shouldn't you help by writing a more detailed manual?
I must say that the lack of step by step instructions (or, at least, the lack of easily discoverable instructions) in the Wiki and manuals disappointed me. There seems to be no clear set of instructions along the lines of "do this... see this... do this... see this" in the Wiki or the manuals. Quite frustrating for a novice. I like the ISY. It's easy to program and it makes using my INSTEON devices a snap compared to manual linking. But one feature I also wanted was control when I was away from home. What I have read tells me this can be done. But the documentation isn't helpful.