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I installed nrpe on new servers. Nagios is already running and checking other server (I haven't installed).

I've got several error lines in my syslog file :

Oct 31 15:17:01 myservername nrpe[41848]: Host nagios_ip is not allowed to talk to us!

My nrpe.cfg file includes the following line :

allowed_hosts=nagios_ip

What am I doing wrong ?

(with nagios_ip the actual IP for my nagios server)

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Have you tried restarting the nrpe service on the target server? –  norrland Oct 31 '13 at 14:45
    
Yes I did but it had no effect –  Jean-Philippe Caruana Oct 31 '13 at 14:47
    
Which OS and Nagios/NRPE version is installed? –  norrland Oct 31 '13 at 14:52
    
Also. Check nrpe.conf for whitespaces after allowed_hosts=<ip>. In vim :set list –  norrland Oct 31 '13 at 14:54

2 Answers 2

up vote 2 down vote accepted

I found the solution, but the error message is totally misleading. The user nagios has to be in the suders...

/etc/sudoers:

nagios  ALL=(ALL) NOPASSWD: /usr/lib/nagios/plugins/
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1  
this is not correct at all, actually –  Keith Oct 31 '13 at 18:02
3  
well, this solved the problem at once. Could you be more specific ? –  Jean-Philippe Caruana Nov 4 '13 at 9:16

Had the same entry in my syslog. Editing /etc/nagios/nrpe.cfg and enter missing IP will fixed it at all.

allowed_hosts=1.2.3.4/24,127.0.0.1

After editing you have to restart or even reload nrpe deamon.

/etc/init.d/nagios-nrpe-server reload

Check if it is all fine with your configuration. Syslog should have an entry like this:

Allowing connections from: 1.2.3.4/24,127.0.0.1

I advise you not to add user nagios to sudoers because of security issues.

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