title: CondaHTTPError - SSL error while installing NLTK
body: <p>I am trying to install NLTK in my tensorflow environment of Anaconda. I have used the command "conda install nltk" for my windows 7 pc. It gives the following error:</p>
  
  <pre><code> CondaHTTPError: HTTP 000 CONNECTION FAILED for url
   &lt;https://repo.continuum.io/pkgs/r/win-32/repodata.json.bz2&gt;
   Elapsed: -
  
   An HTTP error occurred when trying to retrieve this URL.
   HTTP errors are often intermittent, and a simple retry will get you on   your way.
  
   SSLError(MaxRetryError('HTTPSConnectionPool(host=\'repo.continuum.io\', port=443): Max retries exceeded with url: /pkgs/r/win-32/repodata.json.bz2 (Caused by SSLError(SSLError("bad handshake: Error([(\'SSL routines\', \'ssl3_get_server_certificate\', \'certificate verify failed\')],)",),))',),)
  </code></pre>
  
  <p>I have an additional certificate in my system. So I added the certificate hash to cert.pem file of anaconda/ssl. It worked for Linux machine, but windows machine still throws error. What can I do to solve this?</p>