It working for me right now, what I did; was disabled the firewall settings built in in my router and upnp options.
Well, looks like this thread is like a rant and nobody cares to read for 228 pages long. what I bummer.
What I observed from SpaceInvaderOne guides are still good but most are outdated unless he updated in the comment section. For others content, you can follow but you should be cautious because settings will likely not compatible with latest version. Some tips and gotcha I'd observed, you can get the instruction inside cnf/config files in comments section. And also read author documentations/wiki guides on how to configure.
Unraid server (particularly docker) just present the configuration in the screen and eventually submitted into command line. You can read author's guide or clicking the question mark in the top right screen below your username; to see some valid values and tips.