title: 'urllib2.URLError'(<urlopen error [Errno -3] Temporary failure in name resolution>
body: <p>I have a web2py app installed which is served by Apache. After months of successful deployment, the website suddenly stops functioning with the error:</p>
  
  <pre><code>class 'urllib2.URLError'(urlopen error [Errno -3] Temporary failure in name resolution)
  </code></pre>
  
  <p>I tried restarting the app and apache but it did not help. What are the possible causes for such an event to happen?</p>
  
  <p>The system worked fine after a reboot.</p>