title: Kafka: Broker may be not available via CLI
body: <p>I have started learning Kafka and facing a issue when i trying to launch a producer via cmd in Windows 10.</p>
  <p>Also,i have added localhost details after PLAINTEXT in <code>server.properties</code> as
  <code>PLAINTEXT\127.0.01:9092</code></p>
  <pre><code>C:\&gt;kafka-console-producer --broker-list localhost:9092 --topic Demo
  </code></pre>
  <p>Find the error trace below:</p>
  <pre><code>[2021-03-19 03:10:42,338] WARN [Producer clientId=console-producer] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
  [2021-03-19 03:10:47,433] WARN [Producer clientId=console-producer] Bootstrap broker localhost:9092 (id: -1 rack: null) disconnected (org.apache.kafka.clients.NetworkClient)
  </code></pre>