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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "ConnectionRefused" by SteveLoughran
Date Tue, 15 Sep 2009 11:28:53 GMT
Dear Wiki user,

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

The following page has been changed by SteveLoughran:
http://wiki.apache.org/hadoop/ConnectionRefused

The comment on the change is:
page on a commonly seen error

New page:
= Connection Refused =

You get a ConnectionRefused Exception when there is a machine at the address specified, but
there is no program listening on the specific TCP port the client is using -and there is no
firewall in the way silently dropping TCP connection requests. If you do not know what a TCP
connection request is, please consult the [http://www.ietf.org/rfc/rfc793.txt specification].


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 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.
 1. Try connecting to the server/port from a different machine, to see if it just the single
client misbehaving. 

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