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The "ConnectionRefused" page has been changed by SteveLoughran: https://wiki.apache.org/hadoop/ConnectionRefused?action=diff&rev1=9&rev2=10 Comment: call out localhost:8020 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. + 1. If the error message says the remote service is on "127.0.0.1" or "localhost" that means the configuration file is telling the client that the service is on the local server. If your client is trying to talk to a remote system, then your configuration is broken. 1. Check that there isn't an entry for your hostname mapped to 127.0.0.1 or 127.0.1.1 in /etc/hosts (Ubuntu is notorious for this) 1. Check the port the client is trying to talk to using matches that the server is offering a service on. 1. On the server, try a {{{telnet localhost <port>}}} to see if the port is open there.
