Github user vanzin commented on the issue:

    https://github.com/apache/spark/pull/21243
  
    > What kind of exceptions will client AM meet usually?
    
    We see a non-trivial amount of people running into connection issues 
between the AM and the driver. It's typically a firewall issue or something of 
the sort, but because the error message is completely non-helpful, they end up 
calling support.


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