URGENT REPOST: CHECK_NRPE: Received 0 bytes fromdaemon ErrorMessage

[Kaplan, Andrew H.]

The NRPE issue that has been very problematic has generated another error. I was
briefly getting output back from the remote client, but now

I am getting the error message: 

 

NRPE: Unable to read output. 

 

Here is a brief listing of the configuration:

 

Nagios server: Nagios 2.6

NRPE client: 2.5.2 running on an HP-UX 11.11 system

Allowed hosts: 0.0.0.0

 

The remote client uses inetd (without tcp wrappers) and here is the
configuration in the inetd.conf file:

 

nrpe stream tcp nowait bin /usr/local/nagios/bin/nrpe -c
/usr/local/nagios/nrpe.cfg -inetd

 

The remote client also has a startup script in the /sbin/init.d directory called
nrpe. Here is the text of the script:

 

            /usr/local/nagios/bin/nrpe -n -c /usr/local/nagios/nrpe.cfg -d

 

I checked the log file on the remote client, and there was no indication of any
connection problem. The messages and nagios.log files

on the server simply reported the following:

 

            UNKNOWN;notify-by-email;NRPE: Unable to read ouput. 

 

I have confirmed there is no firewall activated on the system, and that nrpe
communication is allowed on the client. 

 

________________________________

From: Steve Shipway [mailto:s.shipway at auckland.ac.nz] 
Sent: Monday, December 18, 2006 8:24 PM
To: Kaplan, Andrew H.; nagios-users at lists.sourceforge.net
Subject: RE: [Nagios-users] URGENT REPOST: CHECK_NRPE: Received 0 bytes
fromdaemon ErrorMessage

 

Sounds like the daemon is comparing the client's IP against the list of
permitted connections, and not getting a match.  For some reason the query of
the source IP on the connection is returning 0.0.0.0 instead of the source IP -
maybe you have some special wrapper or intervening agent.  I'd suggest running
under xinetd or something similar which can do the filtering instead.

 

Steve

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