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The "ConnectionRefused" page has been changed by SteveLoughran: https://wiki.apache.org/hadoop/ConnectionRefused?action=diff&rev1=10&rev2=11 Comment: point out that the hostname is often in a config option If the application or cluster is not working, and this message appears in the log, then it is more serious. - 1. Check the hostname the client using is correct + 1. Check the hostname the client using is correct. If it's in a Hadoop configuration option: examine it carefully, try doing an ping by hand 1. Check the IP address the client is trying to talk to for the hostname is correct. 1. Make sure the destination address in the exception isn't 0.0.0.0 -this means that you haven't actually configured the client with the real address for that service, and instead it is picking up the server-side property telling it to listen on every port for connections.
