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The "ConnectionRefused" page has been changed by SteveLoughran: https://wiki.apache.org/hadoop/ConnectionRefused?action=diff&rev1=11&rev2=12 Comment: cut out list of suppliers of hadoop-based data stacks, as there are too few of them now 1. On the server, try a {{{telnet localhost <port>}}} to see if the port is open there. 1. On the client, try a {{{telnet <server> <port>}}} to see if the port is accessible remotely. 1. Try connecting to the server/port from a different machine, to see if it just the single client misbehaving. - 1. If you are using a Hadoop-based product from a third party, including those from Cloudera, Hortonworks, Intel, EMC and others -please use the support channels provided by the vendor. + 1. If you are using a Hadoop-based product from a third party, -please use the support channels provided by the vendor. 1. Please do not file bug reports related to your problem, as they will be closed as [[http://wiki.apache.org/hadoop/InvalidJiraIssues|Invalid]] None of these are Hadoop problems, they are host, network and firewall configuration issues. As it is your cluster, [[YourNetworkYourProblem|only you can find out and track down the problem.]]
