Containers and networks

I’m having an odd issues with networking since I’ve moved to the docker CE (17.03.1-ce) on ubuntu 16.04LTS machine.

In example,
Running a rabbitmq container with management allowed me in the past to browse to localhost:15672 and get the management GUI.

I can see the ports being published in the CLI and I can even telnet to them,
another issue is that the container can’t reach the internet (ping doesn’t work).

I’m using the default network settings, haven’t touched them or changed them.

Suggestions what can be wrong ?