title: I can't connect from the outside to the mongo-express
body: <p>I am using the mongo-express.</p>
  
  <p>Installed on AWS EC2, it was started.</p>
  
  <pre><code>$ node app
  Mongo Express server listening on port 8081 at localhost
  Database connected
  Connecting to db...
  Database db connected
  </code></pre>
  
  <p>However, it is not possible to connect from the browser to port 8081.</p>
  
  <p>I can download the index.html of the mongo-express using wget command on ec2.</p>
  
  <pre><code>$ wget http://admin:pass@localhost:8081
  --2016-02-22 02:22:25--  http://admin:*password*@localhost:8081/
  Resolving localhost (localhost)... 127.0.0.1
  Connecting to localhost (localhost)|127.0.0.1|:8081... connected.
  HTTP request sent, awaiting response... 401 Unauthorized
  Authentication selected: Basic realm="Authorization Required"
  Reusing existing connection to localhost:8081.
  HTTP request sent, awaiting response... 200 OK
  Length: 9319 (9.1K) [text/html]
  Saving to: ?index.html?
  
  index.html            0%[                    ]       0  --.-KB/s               GET / 200 218.468 ms - 9319
  index.html          100%[===================&gt;]   9.10K  --.-KB/s    in 0.04s
  
  2016-02-22 02:22:26 (236 KB/s) - ?index.html? saved [9319/9319]
  </code></pre>
  
  <p>By the way, port 8081 in the security group of ec2 is open to my IP.</p>