title: Mongodb can't connect to localhost but can connect to localhost's IP address
body: <p>If I try to run mongodb shell with the <code>mongo</code> command alone, I get:</p>
  
  <pre><code>Error: couldn't connect to server 127.0.0.1 shell/mongo.js:84
  </code></pre>
  
  <p>exception: connect failed</p>
  
  <p>However, if I stipulate localhost's LAN IP address like this:</p>
  
  <pre><code>mongo 10.10.5.90
  </code></pre>
  
  <p>...it connects fine.</p>
  
  <p>Any clues??</p>