Nagios Support Forum

This server was running Nagios core version 3.2.1.
I uninstalled Nagios and installed Nagios xi client.
I have done this successfully several times before.

I have verified /usr/local/nagios/etc/nrpe.cfg
allowed_hosts=127.0.0.1,10.100.6.186
dont_blame_nrpe=1

I have also verified /etc/xinetd.d/nrpe
only_from = 10.100.6.186

from the command line I am able to run check commands
/usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20
OK - load average: 0.00, 0.02, 0.00|load1=0.000;15.000;30.000;0; load5=0.020;10.000;25.000;0; load15=0.000;5.000;20.000;0;

the above command worked with the firewall started and stopped.
firewall is down right now until I figure this issue out.

I see "Connection refused by host" from the Nagios XI server web interface.

when I check netstat I do not see the nrpe process. I also do not see it from a ps command.

I do see nsca
tcp 0 0 *:nsca *:* LISTEN

I have tried restarting xinetd server and that doesn't help.

Red Hat Enterprise Linux Server release 5.2
32-bit server

please help
thanks

Is 10.100.6.186 you nagios XI server, or a remote host?

nagios server is 10.100.6.186

Have you attempted to run the nrpe binary with the -c [config file] options? Otherwise let's verify that port seems to be open from the outside.

nmap -p 5666-5667 10.100.6.104

Starting Nmap 5.51 ( http://nmap.org ) at 2014-05-16 04:51 CDT
Nmap scan report for www.labels-wbmason.com (10.100.6.104)
Host is up (0.0011s latency).
PORT STATE SERVICE
5666/tcp closed nrpe
5667/tcp open unknown
MAC Address: 00:1B:78:D0:3D:98 (Hewlett Packard)

Nmap done: 1 IP address (1 host up) scanned in 0.28 seconds

To help clarify...
the client server having the issue = 10.100.6.104
Nagios server = 10.100.6.186

Well, looks like port 5666 is closed, you will need that open to communicate via NRPE.

how do I open the port?

The firewall is off.
I've restarted xinetd.
I've even rebooted the server.

is there something wrong with nrpe? Should I uninstall and re-install the nagios client?

I'm not aware of a way to open a port. I thought all ports are open based on a service that needs that port.

thoughts?

-pete

How did you install the linux agent? Did you follow this document? You can try reinstalling the agent, following our official documentation.

Yes I followed all these steps.
Everything except the wget. I have a copy of the install downloaded to a central repository.

I do not see an un-install script. Do I just delete all the files in /usr/local/nagios?
when I run the full install it thinks everything is fine.


Do you want to continue? [Y/n] y
Proceeding with installation...
Running './0-yum'...
Yum already configured - exiting.
RESULT=0
Running './1-prereqs'...
Prereqs already installed - skipping...
Note: If you want to update the RPMs installed on this system, run 'yum update'
RESULT=0
Running './2-usersgroups'...
Users/groups already configured - skipping.
RESULT=0
Running './3-services'...
/etc/services already updated - skipping.
RESULT=0
Running './4-firewall'...
Firewall rules already configured - skipping.
RESULT=0
Running './A-subcomponents'...
Subcomponents already configured - skipping.
RESULT=0

##########################################################
### ###
### Nagios XI Linux Agent Installation Complete! ###
### ###
##########################################################

If you experience any problems, please attach the file install.log that was just created to any support requests.