[Nagiosplug-help] problem with nrpe

Seth Simmons ssimmons at cymfony.com
Wed Mar 19 23:58:22 CET 2008

Found the problem.
Forgot to change only_from value of localhost to the nagios server in
/etc/xinetd.d/nrpe on the other machines; working now - knew it had to
be something stupid I was missing. 

-----Original Message-----
From: kevin at roundsphere.com [mailto:kevin at roundsphere.com] 
Sent: Wednesday, March 19, 2008 5:57 PM
To: Seth Simmons
Cc: nagiosplug-help at lists.sourceforge.net
Subject: Re: [Nagiosplug-help] problem with nrpe

On Tue, 18 Mar 2008 19:29:10 +0100 (CET), seth simmons
<ssimmons at cymfony.com> wrote:
> I have a problem communicating with nrpe.  I can do a local check on 
> both systems and it works fine.  When I try to do a remote check, it 
> fails saying 0 bytes received from daemon, check logs etc...
> I originally was getting ssl errors, but it went away after doing 
> ./configure --disable-ssl so I'm not sure what the issue is.  I've 
> tried the plugin on two different clients with the same results.  I 
> don't know if the issue is with the way I setup the client or if it's 
> the server-or perhaps both?

It appears to be a communication problem, my guess would be a
configuration problem on the client (xinetd or firewall).  I would check
the following things on the client.

netstat -a | grep nrpe # is it listening on the right port?
iptables -L # make sure the firewall is open on port 5666

Then from the server try to telnet to the client on port 5666:

telnet client 5666 # does it open a connection or is the connection

Once you get the communication working, I would compile back in ssl
support since that was most likely a symptom and not the problem.



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