title: Rails Server Keeps Exiting (SocketError)
body: <p>Rails noob here. I'm trying to work through Michael Hartl's Ruby on Rails Tutorial, but every time I run rails server, it keeps Exiting and shows me a SocketError. I was able to run the server just fine this past weekend using wifi from a startup, so I'm guessing it has something to do with my internet connection/firewall? I also ran into the same problem with the server at the library this afternoon. </p>
  
  <p>Any help is appreciated! Thanks in advance.</p>
  
  <pre><code>=&gt; Booting WEBrick
  =&gt; Rails 4.2.0 application starting in development on http://localhost:3000
  =&gt; Run `rails server -h` for more startup options
  =&gt; Ctrl-C to shutdown server
  [2015-02-23 22:33:11] INFO  WEBrick 1.3.1
  [2015-02-23 22:33:11] INFO  ruby 2.2.0 (2014-12-25) [x86_64-darwin14]
  Exiting
  /Users/awo/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/socket.rb:232:in  `getaddrinfo': getaddrinfo: nodename nor servname provided, or not known (SocketError)
  </code></pre>