title: Mosquitto_sub Error: Connection refused
body: <p>I am using the Mosquitto(1.4.9) MQTT-Broker (version 3.1) on my Debian 7.8.</p>
  
  <p>I try to execute this command:</p>
  
  <pre><code>mosquitto_sub -t "#" -v
  </code></pre>
  
  <p>The response:</p>
  
  <pre><code>Error: Connection refused
  </code></pre>