title: Keeping connection after removing/(change IP address) in security policies in AWS
body: <p>In AWS console we must specify actual rules in order make it possible to access EC2 instances from remote localizations.
  I mean rules like opening some port or access from allowed IP addresses.</p>
  
  <p>And it is working for me now.</p>
  
  <p>I consider following scenario:</p>
  
  <p>Let's assume that we have application A which maitain long running connection and everything is working because 
  security rules are properly set. Now, </p>
  
  <p>(a) someone remove rules allowing application A connect to EC2 instancs (so external IP address which is used by application A)<br>
  (b) at any point external IP address of machine used by application A change. </p>
  
  <p>I consider if it is possible that connection established before occurence (a) or (b) keeps working? If yes, then how is it possible?</p>