title: Can't open anaconda jupyter notebook: Network Error (dns_unresolved_hostname)
body: <p>On my Windows 7 64-bit, I installed Anaconda3 v4.4.0 in C:\Anaconda3. Now, after launching Anaconda Navigator, I can't launch jupyter notebook from there. </p>
  
  <p>If I in command prompt run "C:\Anaconda3\Scripts>jupyter notebook", Chrome browser opened a new tab to "<a href="http://localhost:8888/tree?token=62d7eb16e2b7c5a9198ff6a84ec1056a00d60aeb99df55f0" rel="nofollow noreferrer">http://localhost:8888/tree?token=62d7eb16e2b7c5a9198ff6a84ec1056a00d60aeb99df55f0</a>" but the content is </p>
  
  <pre><code>Network Error (dns_unresolved_hostname) 
  Your requested host "localhost" could not be resolved by DNS.
  For assistance, contact your network support team.
  </code></pre>
  
  <p>The <code>hosts</code> file in <code>C:\Windows\System32\drivers\etc\</code> has content as:</p>
  
  <pre><code>127.0.0.1       localhost
  127.0.0.1 office.microsoft.com
  </code></pre>
  
  <p>what shall I do? seems it's a network or access rights issue?</p>