Setup of nginx proxy manager addon

Hi All

I have setup the addon:

And I can login and use the addon.

But I get this message with the proxy host:

502 Bad Gateway

Where is the location of the served files?
I have placed an index.html under /var/www/domain.tld/

1 The location in ‘Custom location’->‘location’->/var/www/domain.tld/
2 I have set the ‘forward’ host name to ‘domain.tld’
3 Port is set to 80 and forwarded from the router

What am I missing?