Conflict between docker-proxy and nginx

Question

I want to run a dockerized nginx on port 443 (https), but this seems to be taken by the docker-proxy.

Why is this, and can I do someting about it?

EDIT

The same conflict happens with the http port (80)

Answer 1

docker-proxy is run when you publish a port on the host. Look for the container or service you have run that is publishing the port and remove it:

$ docker container ls
$ docker service ls