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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "ConnectionRefused" by SteveLoughran
Date Thu, 17 Apr 2014 12:40:09 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:
https://wiki.apache.org/hadoop/ConnectionRefused?action=diff&rev1=8&rev2=9

Comment:
call out 0.0.0.0 as a special case

  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 IP address the client gets for the hostname is correct.
+  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. 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. 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.
   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.

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