Probably not your issue but I have seen this a lot of times, most often when HBase had shutdown (or I forgot to start it) and I hadn't realized it. I.e., you get that same message if HBase isn't actually running. I'm sure you already checked but you might verify that the hbase process is actually still up and running when you get the error (or that it started at all - it appears by default there is no error message if it fails to start or output letting you know it was successful).
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