>rails server => Booting Thin => Rails 3.2.17 application starting in development on http://0.0.0.0:3000 => Call with -d to detach => Ctrl-C to shutdown server Exiting /Users/hoge/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/activerecord-3.2.17/lib/active_record/connection_adapters/postgresql_adapter.rb:1222:in `initialize': could not connect to server: Connection refused (PG::ConnectionBad