title: Unable to connect EC2 instance to RDS in same VPC
body: <ul>
  <li><p>The EC2 instance is in the same VPC and has a public IP.</p></li>
  <li><p>The RDS instance has an inbound Security Group rule allowing traffic from the EC2 Security Group.  </p></li>
  <li><p>All Subnets have access to the Internet Gateway, and all subnets use the default Route Table</p></li>
  </ul>
  
  <p>If I add the public IP address of the EC2 instance to the RDS security group, the connection works, however; an inbound rule on the Security Group within the same VPC should be sufficient.</p>
  
  <p>What am I missing?</p>