title: iPython notebook not working behind VPN
body: <p>I'm running iPython notebook on my local computer. However, because I am in China, I need to use a VPN (specifically Astrill's OpenWeb protocol) to access most of the internet. On one of my PCs, iPython notebook won't run properly when the VPN is running. For example, when opening my homepage: <code>http://localhost:8888/tree</code>, I see the error message: </p>
  
  <pre><code>Astrill Error
  Connection Closed Gracefully
  </code></pre>
  
  <p>iPython notebook also won't let me open or save workbooks if the VPN is running. Any idea why and how I can fix that?</p>