title: pip install generates WARNINGS : 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPConnection object at ...>
body: <p>I have spent a lot of time searching if someone did already have the same issue but I did not find anything.</p>
  
  <p>For some time, I have warnings each time I want to install a package with pip. The installation works at the end but it takes much more time. The warning consists in a repetition of 5 times the same WARNING :</p>
  
  <pre><code>WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('&lt;pip._vendor.urllib3.connection.HTTPConnection object at 0x105b71c50&gt;: Failed to establish a new connection: [Errno 61] Connection refused')': /simple/mako/
  WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('&lt;pip._vendor.urllib3.connection.HTTPConnection object at 0x105b6c690&gt;: Failed to establish a new connection: [Errno 61] Connection refused')': /simple/mako/
  WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('&lt;pip._vendor.urllib3.connection.HTTPConnection object at 0x105b6cb90&gt;: Failed to establish a new connection: [Errno 61] Connection refused')': /simple/mako/
  WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('&lt;pip._vendor.urllib3.connection.HTTPConnection object at 0x105bb6f10&gt;: Failed to establish a new connection: [Errno 61] Connection refused')': /simple/mako/
  WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('&lt;pip._vendor.urllib3.connection.HTTPConnection object at 0x105bb67d0&gt;: Failed to establish a new connection: [Errno 61] Connection refused')': /simple/mako/
  </code></pre>
  
  <p>After these warnings, everything seems to work well, but I would like to remove them to speed up the installations.</p>
  
  <p>If you need more information, please don't hesitate to ask, I am not sure where I should dig to solve that so I don't know what kind of information would be needed.</p>
  
  <p>Thank you very much for your help !</p>