Filemaker + tableau problem

Hello, I've been trying to connect tableau to filemaker using this guide

FileMaker & Tableau | A Match Made in Data Heaven! – beezwax > blog

First part, all good, no problem a fm file running on the server with the privileges needed.

However when I'm going to use the webconnection in tableau I cannot get it to work.

passing my server domain just like it suggests (with my own domain)

https://mydomain.com/fmi/rest/tableau/fm_connector.html

but get "Unable to load the following URL:....."

Im pretty sure there are a domain error? But Im not sure to debug this.

When Im testing the like above I get 404 error. I've would expect some credential validation or whatever.

Sorry really new to this, so if anybody have the smallest guideline I would be very happy

macOS Sierra v 10.12.16

FM server 16

FM pro advance 16

Tableau desktop 10.5