EDIT: I would like to point out that I did advise Evert (twice) that specifying an external address fot the port forwarding would never work eg : -
Hmmm, wanna bet he uses Nabu casa.???
How did you get on with using your neighbours WiFi to access ?
You are at the limits of my knowledge / experience on this subject now, all I can say is my port forwarding is TCP only and leaves the external address blank. From here on in I think you are breaking new ground. Here is a map of the area you will be travelling through, its blank so just fill it in as you go along
Seriously, if you find out anything more on this report back and I’ll update the thread.
Side Note: Your English is damned good !