title: Kafka listening, even when AWS SecGrp is turned off
body: <p>We're seeing a really strange issue here. We have Kafka running on AWS, with the producer instance talking to these Kafka instances, all within the same VPC.</p>
  
  <p>To simulate a Kafka-down scenario, we removed the entry in the Kafka instances' AWS SecGrp for 9092-9093 ports incoming from the producer's SecGrp. In other words, the producer should ideally NOT be able to talk to Kafka anymore. But, here's the strange part: Kafka continues to ingest data from the producer for another couple of minutes even after this. </p>
  
  <p>There HAS to be something more to this than meets the eye! Can someone enlighten me, please?</p>