Docker problem with registration

[ebbot]

I have built a NAS and I am trying different server software at the moment. Currently on Openmediavault with Docker. Two problems:

I have Minimstreamer finally up and running and I can play some tunes. But when I try to activate I get a "Network connection to minimworld.com not available". Some ports not working, or?

Another thing, I can't start the container from the shell with docker run -d container-name. I get "Unable to find image name:latest locally". But I can stop the container with docker stop container-name. However, in Openmediavault the container is startable... I guess there are something wrong with permissions?