React Router Redirect, LocalHost3000, and Proxy plus Firewall.... need help!

Having trouble with https://localhost:3000. When I click on the link, system refuses to display the current exercise. It says I need to do something with a Firewall and/or a Proxy. I look for these settings in Chrome, and I go down that Techie Rabbit hole, and get lost! Please help me out here. Thanks!

[(https://www.codecademy.com/paths/full-stack-engineer-career-path/tracks/fscp-22-react-part-ii/modules/wdcp-22-react-router/lessons/intermediate-react-react-router/exercises/basic-routing-with-route)]