I have a Vagrant VM with Rails installed with a sample app. The VM is configured to forward the port 3000 (of Rails Webrick server) to my host 3000 port.
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Rails 4.2 now binds to 127.0.0.1 by default and not 0.0.0.0.
127.0.0.1
0.0.0.0
Start the server using bin/rails server -b 0.0.0.0 and that should sort it.
bin/rails server -b 0.0.0.0