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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "ConnectionRefused" by SteveLoughran
Date Fri, 10 Aug 2012 18:24:59 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Hadoop Wiki" for change notification.

The "ConnectionRefused" page has been changed by SteveLoughran:
http://wiki.apache.org/hadoop/ConnectionRefused?action=diff&rev1=3&rev2=4

Comment:
mention 127.0.0.1

  Unless there is a configuration error at either end, a common cause for this is the Hadoop
service isn't running.
   1. Check the hostname the client using is correct
   1. Check the IP address the client gets for the hostname is correct.
+  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 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.
   1. On the client, try a {{{telnet <server> <port>}}} to see if the port is
accessible remotely.

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