title: How to disable password request for a Jupyter notebook session?
body: <p>I have been launching Jupyter Notebook for years using the following command:</p>
  <pre><code>jupyter-notebook --port=7000 --no-browser --no-mathjax
  </code></pre>
  <p>When I try to open the jupyter on the browser it ask me for a password, even though I have never set any before.
  It is important to note that If I do set the port to a value different than <code>7000 (eg., the default 8888)</code> the interface will open with no problem</p>
  <p><strong>I am running jupyter locally, and on the following setup:</strong></p>
  <pre><code>Python 3.5.2
  </code></pre>
  <p><strong>With the following modules installed:</strong></p>
  <pre><code>jupyter (1.0.0), jupyter-client (4.4.0), jupyter-console (5.0.0), jupyter-core (4.2.1), ipykernel (4.5.2), ipython (5.1.0), ipython-genutils (0.1.0), nbconvert (4.3.0), nbformat (4.2.0), notebook (4.3.0)
  </code></pre>
  <p><strong>NOTE: I have no jupyter configurations file</strong></p>
  <p>Following are some of the output lines from the server:</p>
  <pre><code>[I 19:16:24.358 NotebookApp] Serving notebooks from local directory: /Users/my_user_name
  [I 19:16:24.358 NotebookApp] 0 active kernels
  [I 19:16:24.358 NotebookApp] The Jupyter Notebook is running at: http://localhost:7000/?token=aa0dab6e2d85766f3e2e4f0f6633e4473db56a56c94cac76
  [I 19:16:24.358 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
  </code></pre>
  <p>And follwing are messages after I try to open it on the browser (using port 7000)</p>
  <pre><code>[I 19:21:56.848 NotebookApp] 302 GET /tree (::1) 8.46ms
  [D 19:21:56.857 NotebookApp] Using contents: services/contents
  [D 19:21:56.919 NotebookApp] Path base/images/favicon.ico served from /usr/local/lib/python3.5/site-packages/notebook/static/base/images/favicon.ico
  [D 19:21:56.920 NotebookApp] Path components/jquery-ui/themes/smoothness/jquery-ui.min.css served from /usr/local/lib/python3.5/site-packages/notebook/static/components/jquery-ui/themes/smoothness/jquery-ui.min.css
  [D 19:21:56.922 NotebookApp] Path components/jquery-typeahead/dist/jquery.typeahead.min.css served from /usr/local/lib/python3.5/site-packages/notebook/static/components/jquery-typeahead/dist/jquery.typeahead.min.css
  [D 19:21:56.923 NotebookApp] Path style/style.min.css served from /usr/local/lib/python3.5/site-packages/notebook/static/style/style.min.css
  [D 19:21:56.925 NotebookApp] Path auth/css/override.css served from /usr/local/lib/python3.5/site-packages/notebook/static/auth/css/override.css
  [D 19:21:56.926 NotebookApp] Path components/es6-promise/promise.min.js served from /usr/local/lib/python3.5/site-packages/notebook/static/components/es6-promise/promise.min.js
  [D 19:21:56.926 NotebookApp] Path components/requirejs/require.js served from /usr/local/lib/python3.5/site-packages/notebook/static/components/requirejs/require.js
  [D 19:21:56.933 NotebookApp] Path base/images/logo.png served from /usr/local/lib/python3.5/site-packages/notebook/static/base/images/logo.png
  [D 19:21:56.934 NotebookApp] 200 GET /login?next=%2Ftree (::1) 80.86ms
  [D 19:21:57.001 NotebookApp] Path custom.css served from /usr/local/lib/python3.5/site-packages/notebook/static/custom/custom.css
  [D 19:21:57.003 NotebookApp] 304 GET /custom/custom.css (::1) 3.11ms
  [D 19:21:57.341 NotebookApp] Path auth/js/main.min.js served from /usr/local/lib/python3.5/site-packages/notebook/static/auth/js/main.min.js
  [D 19:21:57.344 NotebookApp] 200 GET /static/auth/js/main.min.js?v=20161219191623 (::1) 3.57ms
  </code></pre>
  <p>At this point there is a page from jupyter asking me to insert a password I have never set before.</p>
  <h2>SOLVED!</h2>
  <p>With latest update of notebook module (4.3.1) the problem has been solved.</p>
  <p>Once the jupyter notebook is launched the user is prompted to paste a URL into the browser at the first connection:</p>
  <pre><code>Copy/paste this URL into your browser when you connect for the first time,
  to login with a token:
      http://localhost:7000/?token=32be0f5ee74cfe521187bc479855ce8b9fbab9e8021701c9
  </code></pre>
  <p>This solved the problem!</p>