title: Can't connect to a mongodb if it is secure
body: <p>I'm trying to connect my app to MongoDB using <code>MONGO_URL:</code> in MUP. The database is on an independent VPS. The VPS is behind a firewall and is connected to the app VPS via a private network. If I don't secure the database with a username and password I can get it to connect however if I create a user to allow readWrite commands to add security it wont connect. I get this error.</p>
  
  <p><code>MongoError: failed to connect to server [private-network-ip:27017]</code></p>
  
  <p>If I log into the database and use <code>show dbs</code> this is what appears:</p>
  
  <pre><code>admin         0.000GB
  myspecial_db  0.000GB
  local         0.000GB
  </code></pre>
  
  <p>I'm trying to access the <code>myspecial_db</code>. </p>
  
  <p><code>MONGO_URL: mongodb://username:password@private-network-ip:27017/myspecial_db</code></p>
  
  <p>What am I missing here?</p>