title: Error : Max retries exceeded with url: /v3/auth/tokens
body: <p>I'm trying to use the Openstack API for the first time with the Python SDK.
  But I am getting below error:</p>
  <pre><code>Unable to establish connection to https://172.23.13.30/v3/auth/tokens: HTTPSConnectionPool(host='172.23.13.30', port=443): Max retries exceeded with url: /v3/auth/tokens (Caused by NewConnectionError('&lt;urllib3.connection.HTTPSConnection object at 0x7ff031441040&gt;: Failed to establish a new connection: [Errno 101] Network unreachable'))
  </code></pre>
  <p>What should I do?</p>