Thanks to everyone who replied. It turns out that references to truststores and server keys, etc., and associated passwords may be cached, so when we changed these after moving the cluster, creating new cerrts and replacing the passwords in CDH was insufficient. So, after DELETING all fields containing passwords, cert locations, key locations, etc.,unchecking SSL, restarting the cluster, and adding the references back in, everything works. Uugghhh - who knew! 🙂 B
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