I think the issue may lie at #6, Your wireless network. Quite a few routers have Firewalls built in. I'm giving you this Link which will help you open a Port, but you will have to get more info on the router/modum. You will need Model #'s and then you can find your router to start the process.
PortForward.com - Free Help Setting up Your Router or Firewall.
To be honest with you I'm not up on Networking and WiFi, so I hope this helps.

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