title: IPAddr::InvalidAddressError: invalid address
body: <p>I'm getting a random "We're sorry, but something went wrong" when I start the rails server and a <code>IPAddr::InvalidAddressError: invalid address</code> error in the terminal.  Most of the time Ill get the error, but sometimes it will actually work for a few minutes and then show up. No idea what the issue could be. </p>
  
  <p>Edit: Ok now im gettign a completely new error after restart my computer. </p>
  
  <pre><code>PG::ConnectionBad (could not connect to server: Connection refused
      Is the server running on host "localhost" (::1) and accepting
      TCP/IP connections on port 5432?
  could not connect to server: Connection refused
      Is the server running on host "localhost" (fe80::1) and accepting
      TCP/IP connections on port 5432?
  could not connect to server: Connection refused
      Is the server running on host "localhost" (127.0.0.1) and accepting
      TCP/IP connections on port 5432?
  ):
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    activerecord (4.2.6) lib/active_record/connection_adapters/postgresql_adapter.rb:651:in `new'
    activerecord (4.2.6) lib/active_record/connection_adapters/postgresql_adapter.rb:651:in `connect'
    activerecord (4.2.6) lib/active_record/connection_adapters/postgresql_adapter.rb:242:in `initialize'
    activerecord (4.2.6) lib/active_record/connection_adapters/postgresql_adapter.rb:44:in `new'
    activerecord (4.2.6) lib/active_record/connection_adapters/postgresql_adapter.rb:44:in `postgresql_connection'
    activerecord (4.2.6) lib/active_record/connection_adapters/abstract/connection_pool.rb:438:in `new_connection'
    activerecord (4.2.6) lib/active_record/connection_adapters/abstract/connection_pool.rb:448:in `checkout_new_connection'
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    /Users/David/.rbenv/versions/2.3.1/lib/ruby/2.3.0/monitor.rb:214:in `mon_synchronize'
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    activerecord (4.2.6) lib/active_record/connection_handling.rb:113:in `retrieve_connection'
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    railties (4.2.6) lib/rails/rack/logger.rb:38:in `call_app'
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    activesupport (4.2.6) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
    rack (1.6.4) lib/rack/lock.rb:17:in `call'
    actionpack (4.2.6) lib/action_dispatch/middleware/static.rb:120:in `call'
    rack (1.6.4) lib/rack/sendfile.rb:113:in `call'
    railties (4.2.6) lib/rails/engine.rb:518:in `call'
    railties (4.2.6) lib/rails/application.rb:165:in `call'
    rack (1.6.4) lib/rack/lock.rb:17:in `call'
    rack (1.6.4) lib/rack/content_length.rb:15:in `call'
    rack (1.6.4) lib/rack/handler/webrick.rb:88:in `service'
    /Users/David/.rbenv/versions/2.3.1/lib/ruby/2.3.0/webrick/httpserver.rb:140:in `service'
    /Users/David/.rbenv/versions/2.3.1/lib/ruby/2.3.0/webrick/httpserver.rb:96:in `run'
    /Users/David/.rbenv/versions/2.3.1/lib/ruby/2.3.0/webrick/server.rb:296:in `block in start_thread'
  
  
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  </code></pre>