title: Failed to connect to duckling http server. Make sure the duckling server is running and the proper host and port are set in the configuration
body: <p>I have made workplace on slack and app is registered there from where i get the necessary things like slack token and channel to put it into the credentials.yml file of the rasa. After getting all the credentials i tried to connect between the rasa bot and slack using the command as:</p>
  
  <pre><code>rasa run
  </code></pre>
  
  <p>and my credentials.yml contains:</p>
  
  <p>slack:</p>
  
  <pre><code>  slack_token: "xoxb-****************************************"
    slack_channel: "#ghale"
  </code></pre>
  
  <p>Here i have used the ngrok to expose a web server running on your local machine to the internet</p>
  
  <p>but getting the error :</p>
  
  <blockquote>
    <p>rasa.nlu.extractors.duckling_http_extractor  - Failed to connect to duckling http server. Make sure the duckling server is running and the proper host and port are set in the configuration. More information on how to run the server can be found on github: <a href="https://github.com/facebook/duckling#quickstart" rel="nofollow noreferrer">https://github.com/facebook/duckling#quickstart</a> Error: HTTPConnectionPool(host='localhost', port=8000): Max retries exceeded with url: /parse (Caused by NewConnectionError(': Failed to establish a new connection: [WinError 10061] No connection could be made because the target machine actively refused it',))</p>
  </blockquote>