Nagios Support Forum

Posted: **Tue Jun 05, 2012 2:02 pm**

I just set up the linux nrpe clint and wizard on my server. Problem is I am getting the following error:

CHECK_NRPE: Error receiving data from daemon.

Posted: **Tue Jun 05, 2012 3:59 pm**

How did you install NRPE, there are multiple ways.

Did you follow the Linux agent guide,
http://library.nagios.com/library/produ ... inux-agent

or use another method?

Posted: **Wed Jun 06, 2012 12:50 pm**

yes, I used that guide. I also copied and pasted the text into putty. How would I uninstall the agent and try again?

Posted: **Wed Jun 06, 2012 2:10 pm**

You don't need to uninstall the agent - you can just reinstall it. Before you do this, see if you have xinetd installed:

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which xinetd

After you make sure it's installed, reinstall the linux agent following our documentation. Watch out for errors during the install process. Enter the Nagios server IP address towards the end of the installation process (when asked). Then test nrpe to make sure it works on the client site:

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cd /usr/local/nagios/libexec

(Modify this if your plugins directory is in a different location)

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./check_nrpe -H localhost

You should see:

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NRPE v2.12

Note: You may have to add your local host to the "only_from" line in the "/etc/xinetd.d/nrpe":

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only_from = 127.0.0.1 192.168.X.X

Things to watch for - iptables, port 5666.

Hope this helps.

Posted: **Wed Jun 06, 2012 4:37 pm**

the arror i get after doing

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./check_nrpe -H localhost

is:
could not complete ssl handshake

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# default: on
# description: NRPE (Nagios Remote Plugin Executor)
service nrpe
{
       	flags           = REUSE
        socket_type     = stream    
	port		= 5666    
       	wait            = no
        user            = nagios
	group		= nagios
       	server          = /usr/local/nagios/bin/nrpe
        server_args     = -c /usr/local/nagios/etc/nrpe.cfg --inetd
       	log_on_failure  += USERID
        disable         = no
	only_from	= k172.22.3.17
}

Here is what my nrpe cfg looks like:

Posted: **Thu Jun 07, 2012 9:56 am**

You have:

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only_from   = k172.22.3.17

You should probably have:

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only_from   = 172.22.3.17

Are you using xinetd? Can you run the following command?

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cat /etc/xinetd.d/nrpe

Either way, you should have also "127.0.0.1" in the "only_from" line, so that you can run NRPE against the localhost. Also, dont forget to restart the daemon if you make any changes:

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service xinetd restart

Posted: **Thu Jun 07, 2012 11:41 am**

Scott what did you mean by this:

Things to watch for - iptables, port 5666.

Hope this helps.

User avatar
lmiltchev

Posts: 906
Joined: Mon May 23, 2011 1:15 pm

Posted: **Thu Jun 07, 2012 12:03 pm**

Now I am getting a "connection refused " error
I set this up with the wizard using SSL encryption , should I be adding a port or something?

this is what i ran on the client machine:

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Now I am getting a "connection refused " error
I set this up with  the wizard using SSL encryption , should I be adding a port or something?



[code]login as: root
[email protected]'s password:
Last login: Thu Jun  7 12:07:08 2012 from 172.22.240.3
[root@lkennagiosxi01 ~]# cd /usr/local/nagios/libexec
[root@lkennagiosxi01 libexec]# ./check_nrpe -H localhost
CHECK_NRPE: Error - Could not complete SSL handshake.
[root@lkennagiosxi01 libexec]# service xinetd restart
Stopping xinetd:                                           [  OK  ]
Starting xinetd:                                           [  OK  ]
You have new mail in /var/spool/mail/root
[root@lkennagiosxi01 libexec]# service xinetd restart
Stopping xinetd:                                           [  OK  ]
Starting xinetd:                                           [  OK  ]
[root@lkennagiosxi01 libexec]# service xinetd restart
Stopping xinetd:                                           [  OK  ]
Starting xinetd:                                           [  OK  ]


[root@lkennagiosxi01 libexec]# cd /usr/local/nagios/libexec
You have new mail in /var/spool/mail/root
[root@lkennagiosxi01 libexec]# ./check_nrpe -H localhost
CHECK_NRPE: Error - Could not complete SSL handshake.
[root@lkennagiosxi01 libexec]#

Posted: **Thu Jun 07, 2012 12:12 pm**

Can you try telnetting to port 5666 from your nagios server?

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# telnet <your_client_IP> 5666

You can try temporarily disabling the firewall while you are troubleshooting by running in terminal:

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# service iptables stop

Posted: **Thu Jun 07, 2012 12:52 pm**

I ran this on the client server:

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login as: root
[email protected]'s password:
Last login: Thu Jun  7 13:39:47 2012 from 172.22.240.8
[root@lkennagiosxi01 ~]# service iptables stop
Flushing firewall rules:                                   [  OK  ]
Setting chains to policy ACCEPT: filter                    [  OK  ]
Unloading iptables modules:                                [  OK  ]
[root@lkennagiosxi01 ~]#

From the monitoring server:

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login as: root
[email protected]'s password:
Last login: Thu Jun  7 12:26:57 2012 from 172.22.240.3
[root@lkennagiosxi01 ~]# telnet 172.22.2.123 5666
Trying 172.22.2.123...
Connected to 172.22.2.123 (172.22.2.123).
Escape character is '^]'.
Connection closed by foreign host.
[root@lkennagiosxi01 ~]# telnet 172.22.2.123 5666
Trying 172.22.2.123...
Connected to 172.22.2.123 (172.22.2.123).
Escape character is '^]'.
Connection closed by foreign host.
You have new mail in /var/spool/mail/root
[root@lkennagiosxi01 ~]#

No good

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