BACKGROUND: I'm using Aventail on my MacBook Pro and my iPad Mini. Neither can connect to the server when I use my home network which is secured with an Apple Airport Extreme with version 7.6.4 of the firmware - which I believe to be current. I have been able to connect via my phone's hotspot, my in-laws linksys network, and other guest networks. But not through my Airport Extreme.
Everything I read suggests that the Airport is broken. Of course there is nothing to confirm that on any of Apple's support sites. There are some other comments that suggest that there is some double-nat-ing taking place. And others have recommended installing previous versions of the firmware.
QUESTION: What is the real answer to this challenge or what is the best way to diagnose this problem?