title: Connection to AWS Database fails with Mule app in Runtime Manager
body: <p>I've recently created a Mule application (3.7.0 CE) on a laptop. I'm connected to an AWS RDS instance when running locally in AnyPoint Studio using Maven. I started with a local MySQL DB and migrated it to AWS because my application "proofofconcept" is just that a proof of concept and I would like to show the application online (public url) instead of my laptop for a presentation. I added the database.url=... property to the application properties when I deployed to Anypoint Runtime Manager in the cloud. I'm currently getting a:</p>
  
  <pre><code>communications link failure
  </code></pre>
  
  <p>I've tried several things and nothing has worked. I tried a basic database connection first in the database config. And, then I created a JDBC datasource in Spring-beans. Both methods worked locally and in-communication with AWS (remote). When I deploy to Runtime Manager, the application deploys. And, I get the console that's generated runtime by the RAML. When I call a url e.g. api/v1/orders it runs and runs and after timeout provides the communication error.</p>
  
  <p>Does anyone 1) know if the communication is allowed? 2) know how to fix this? I would like to demo the POC online for my client.</p>
  
  <p>Thanks in advance</p>