title: AWS EC2 - Change Security group - Error
body: <p>I am trying out the tutorial for amazon VPC - Virtual private cloud. </p>
  
  <p><a href="http://docs.amazonwebservices.com/AmazonVPC/latest/UserGuide/VPC_Scenario2.html#Case2_Launch_NAT" rel="nofollow">http://docs.amazonwebservices.com/AmazonVPC/latest/UserGuide/VPC_Scenario2.html#Case2_Launch_NAT</a></p>
  
  <p>I have followed these steps....</p>
  
  <ol>
  <li>Navigate to <a href="https://console.aws.amazon.com/vpc" rel="nofollow">https://console.aws.amazon.com/vpc</a></li>
  <li>Create a VPC.</li>
  <li>Create security groups as outlined by the article.</li>
  <li>I have created the NATSG security group as required by the article. </li>
  <li>When I try to <strong><em>change the security group</em></strong> of the instance to run under the NATSG group it gives me an error - saying it encountered an error without any description.</li>
  </ol>
  
  <p>Any pointers would be appreciated.</p>