i am posting this because i also have a blackberry. I have had active phone for about 3 months and have never been able to get this to work. I am able to connect from the other computers on my network but not from outside my network. Until now, sort of.
I have a netbook that connects to the Verizon network and that is the the computer that i am using as my test subject since it doesn't connect to my network wifi. Anyway until today i have never been able to connect to ahp with that computer or my BB phone. So today i have still been trying things and i have achieved some light at the end of the tunnel. I went to whatismyip.com like many others have suggested, and wrote down the address that it showed. I then use that address in the browser of the netbook. I type
http://71.X.XXX>X>XX, then i put a " :8777/ahp " at the end and now for some reason it actually worked and the remote showed up on the screen and i was able to turn lights on and off. I was very happy at this point. Now for the BB phone. I turn off the wifi on the BB so i know for sure i am doing this thru the internet. I typed in the same address as i did on the netbook and it did actually bring up the remote. but none of the labels showed up on the remote and i couldn't actually push any of the buttons or change the house code.
But this is where i think i have figured a few things out. First of all my blackberry phone is an older one, it is a 8320 model, now things they dont tell you is the 8300 series phones are actually considered 2G versions, not 3G or the new 4G series. I feel this is the main problem, it is too slow to respond properly. Another important thing is- R.I.M ( research in motion ) the company that claims the rights to the BB phone, have quit support for the phone, by this i mean there is no new updates for the operating system or the java update. Andthis i feel is the biggest problem with the phone not working properly.
Now i am going to upgrade to a new phone shortly and will post back but until then i cant be sure if it will work or not. I am thinking that it will work because many others have had good success with this and their BB's