No Connection Thru http://localhost:3000

Each new rails project includes an index.html in the public directory. You need to remove it or replace it. If you are going to redirect / to one of your routes (almost guaranteed), you need to delete it. If not, just replace it with something more appropriate for your project.

Peace,
Phillip

Delete the file, and point one of your routes to
your starting controller. Maybe your login/account signup?