title: MongoDB fails to respond on localhost but works for another node app
body: <p>I'm working on a new node.js app on an old server I use for dev stuff.</p>
  
  <p>Both apps have the mongo URL specified: </p>
  
  <pre><code>var mongoUri = 'mongodb://localhost/node';
  </code></pre>
  
  <p>but on startup, the old node.js app works fine, but the new one doesn't. The new one returns the following for <code>node server.js</code></p>
  
  <pre><code>Error: unable to connect to database at mongodb://localhost/node
      at NativeConnection.&lt;anonymous&gt; (/var/www/server/server.js:15:9)
      at emitOne (events.js:115:13)
      at NativeConnection.emit (events.js:210:7)
      at /var/www/server/node_modules/mongoose/lib/connection.js:336:19
      at args.push (/var/www/server/node_modules/mongodb/lib/utils.js:403:25)
      at /var/www/server/node_modules/mongodb/lib/mongo_client.js:254:21
      at connectCallback (/var/www/server/node_modules/mongodb/lib/mongo_client.js:933:5)
      at /var/www/server/node_modules/mongodb/lib/mongo_client.js:782:11
      at _combinedTickCallback (internal/process/next_tick.js:131:7)
      at process._tickCallback (internal/process/next_tick.js:180:9)
  </code></pre>
  
  <p>Any thoughts or suggestions would be really appreciated. I've tried everything short of reinstalling mongo at this point :(</p>