title: Why does making huge number of requests to AWS ELB result in unknown host error?
body: <p>I am running some perf tests against my API. </p>
  
  <p>Roughly:</p>
  
  <ul>
  <li>100k requests in one minute</li>
  <li>~10k ALB active connection count</li>
  <li>~13k ALB new connection count</li>
  </ul>
  
  <p>The ELB sits in front of 4 m4.large instances, I'm seeing almost no CPU usage. The requests I make eventually starts throwing "Failed to open a socket" and eventually 'UnknownHostException'. It's as if my ELB decided to just rejects these requests and started hiding itself...</p>
  
  <p>I thought ELB don't really have a limit? Even if it did, I would say my numbers are pretty low?</p>