How Do You Troubleshoot “Some of the defined forwarded ports would collide” after Running a Chef Kitchen or Ansible Molecule Command?

Problem scenario
You run a kitchen or molecule command. It fails with an error about ports. What should you do?

Find what other machines are running in your VPC. This error message seems to be relevant to Vagrant (because if you google it, you will see Vagrant-related postings). If you are using Vagrant, run this command: vagrant global-status

If you are not using Vagrant, you may want to use the nmap utility to track down the problem.

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