I have configured the RabbitMQ rabbitmq.config file with new port number i.e. 5671 with SSL.
rabbitmq.config
Now I want to disable the default port i.e. 5672.
It appears that to disable non-ssl listening with the new file format, you can do the following:
listeners.tcp = none
This has the same effect as the other 3.7 answer, but removes the need to do it in the advanced.config.