Github user JPercivall commented on the issue:

    https://github.com/apache/nifi/pull/701
  
    Ocasionally see error:
    3 node secure cluster
    have non-coordinator node disconnect itself
    from the other non-node, refresh cluster panel
    See "An unexpected error has occurred" in panel
    
    ![screen shot 2016-07-22 at 2 42 48 
pm](https://cloud.githubusercontent.com/assets/11302527/17068754/d6883360-5020-11e6-8a84-e9d879426dbd.png)



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