..$ rails s => Booting WEBrick => Rails 4.0.4 application starting in development on http://0.0.0.0:3000 => Run `rails server -h` for more startup options =>
First Find PID # - where the Rails Server got stuck on
Run this to find the stuck PID
cat ./tmp/pids/server.pid
It will return something like 65829
65829
Then KILL that PID => kill 65829
kill 65829