title: H2OServerError: Cluster reports unhealthy status
body: <p>I was training a machine learning model using h2o, but the process crashed while parsing data. I restarted the python kernel, but now when I try to call <code>h2o.connect()</code> again the script raises the following error:</p>
  
  <pre><code>  File "&lt;ipython-input-7-3b2ccf9d3f4c&gt;", line 1, in &lt;module&gt;
      h2o.connect()
  
    File "/Users/victormayrink/anaconda/lib/python3.5/site-packages/h2o/h2o.py", line 74, in connect
      cluster_id=cluster_id, cookies=cookies, verbose=verbose)
  
    File "/Users/victormayrink/anaconda/lib/python3.5/site-packages/h2o/backend/connection.py", line 175, in open
      conn._cluster = conn._test_connection(retries, messages=_msgs)
  
    File "/Users/victormayrink/anaconda/lib/python3.5/site-packages/h2o/backend/connection.py", line 437, in _test_connection
      raise H2OServerError("Cluster reports unhealthy status")
  
  H2OServerError: Cluster reports unhealthy status 
  </code></pre>