failed to connect to 'http://172.18.0.4:8000/' a local Docker InvenTree

[MikeLemo1]

I'm just starting to play with and looking into InvenTree and Docker and I'm running the plugin config wizard interactively but am unable to connect to my docker hosted inventree instance which I'm able to connect to the browser with http://172.18.0.4:8000/ OR http://inventree.localhost/ But the wizard accept erroring:

error: failed to connect to 'http://172.18.0.4:8000/' with 'Could not connect to InvenTree server'

the ip was fetched with docker ps -q | xargs -n 1 docker inspect --format '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}} {{ .Name }}' | sed 's/ \// /'

if it's relevant.

What am I doing wrong