The defaults are fine except for a few areas. Here's my recurring findings.

1. I have to use a different DNS entry. Try 8.8.8.8 on the TV
2. Some routers have firewalls. I find that can interfere so turn that off in the router. There is no standard where this is and a pre-answer is that routers already have a natural firewall so without a book on networking I can't go much deeper than we need to turn this new firewall off.