You want to perform integration tests on your development computer. As part of testing, you want a 3rd-party sandbox server to send its notifications to your computer, but, alas, your computer is behind a firewall. In this session, you will learn how to set up an EC2 instance managed by Phoenix to relay communications bidirectionally between the sandbox and your development computer. See how a Phoenix channel eliminates polling and how an Elixir distribution primitive sets up the channel through the firewall.