title: A connection to the notebook server could not be established. The notebook will continue trying to reconnect
body: <p>All was working fine yesterday but today when I opened jupyter notebook in conda environment, it was throwing error;</p>
  <p>&quot;A connection to the notebook server could not be established. The notebook will continue trying to reconnect. Check your network connection or notebook server configuration.&quot;</p>
  <p>In the Anaconda promt I can see the following;</p>
  <pre><code>To access the notebook, open this file in a browser:
          file:///C:/Users/r.saroj/AppData/Roaming/jupyter/runtime/nbserver-7852-open.html
      Or copy and paste one of these URLs:
          http://localhost:8888/?token=599ce568ac528d059ec077148c47715cab483852377acb58
       or http://127.0.0.1:8888/?token=599ce568ac528d059ec077148c47715cab483852377acb58
  [W 11:11:57.501 NotebookApp] Notebook JJs Farm.ipynb is not trusted
  Bad address (bundled\zeromq\src\epoll.cpp:100)
  [I 11:11:58.464 NotebookApp] Kernel started: c24ae9e4-b0c1-422d-b88d-0e0351fbfe7a, name: python3
  Bad address (bundled\zeromq\src\epoll.cpp:100)
  Exception in thread Thread-6:
  Traceback (most recent call last):
    File &quot;C:\Users\r.saroj\Desktop\Power wind data\Script_JJ\env\lib\threading.py&quot;, line 973, in _bootstrap_inner
  Bad address (bundled\zeromq\src\epoll.cpp:100)
  
  (C:\Users\r.saroj\Desktop\Power wind data\Script_JJ\env) C:\Users\r.saroj\Desktop\Power wind data\Script_JJ&gt;    self.run()
    File &quot;C:\Users\r.saroj\Desktop\Power wind data\Script_JJ\env\lib\threading.py&quot;, line 910, in run
      self._target(*self._args, **self._kwargs)
    File &quot;C:\Users\r.saroj\Desktop\Power wind data\Script_JJ\env\lib\site-packages\ipykernel\iostream.py&quot;, line 81, in _thread_main
      self.io_loop.start()
    File &quot;C:\Users\r.saroj\Desktop\Power wind data\Script_JJ\env\lib\site-packages\tornado\platform\asyncio.py&quot;, line 199, in start
      self.asyncio_loop.run_forever()
    File &quot;C:\Users\r.saroj\Desktop\Power wind data\Script_JJ\env\lib\asyncio\base_events.py&quot;, line 596, in run_forever
      self._run_once()
    File &quot;C:\Users\r.saroj\Desktop\Power wind data\Script_JJ\env\lib\asyncio\base_events.py&quot;, line 1854, in _run_once
      event_list = self._selector.select(timeout)
    File &quot;C:\Users\r.saroj\Desktop\Power wind data\Script_JJ\env\lib\selectors.py&quot;, line 324, in select
      r, w, _ = self._select(self._readers, self._writers, [], timeout)
    File &quot;C:\Users\r.saroj\Desktop\Power wind data\Script_JJ\env\lib\selectors.py&quot;, line 315, in _select
      r, w, x = select.select(r, w, w, timeout)
  OSError: [WinError 10038] An operation was attempted on something that is not a socket 
  </code></pre>
  <p>Please advise.</p>