ipython notebook listening on all IP addresses?
<p>When I launch IPython/Jupyter Notebook, I get the following warnings:</p>

<pre><code>WARNING: The notebook server is listening on all IP addresses and not using encryption. This is not recommended.
WARNING: The notebook server is listening on all IP addresses and not using authentication. This is highly insecure and not recommended.
</code></pre>

<p>What does "listening on all IP addresses" mean?  And how do I fix this?</p>