Nagios Support Forum

I have installed the nogios linux client. From the monitoring server it give the error message Timeout while attempting connection. I have checked the linux firewall and actually tried to disable it with no luck.

I opened 5666 and 5667. Is this the ports the nogios xi client listen on?

what else can i check?

You need port 5666 opened. You can temporarily stop your firewall for troubleshooting purposes:
Check your the nagios server IP address is added in "/etc/xinetd.d/nrpe".
You should see a line that says:

only_from = 127.0.0.1

Add your nagios server IP, so it is going to look like this:

only_from = 127.0.0.1 192.168.X.XXX

Restart the daemon:
Note: Don't use a coma between the two IP addresses; use a space only.

Check if everything is OK on the target machine:
You should see something like this:

tcp 0 0 *:nrpe *:* LISTEN

You should see:

NRPE v2.12

If everything is good, try running this from your nagios server:
You should see the NRPE version as an output.

If you haven't use our documentation for installing the linux agent, you can try to reinstall the agent following this document:

http://assets.nagios.com/downloads/nagi ... _Agent.pdf

I can not find this file:
# vi /etc/xinetd.d/nrpe

I am actually getting - Connection refused by host

jcamillo wrote:I can not find this file:
# vi /etc/xinetd.d/nrpe

Are you looking on the Nagios xi server or the remote machine?

Should be remote machine.

remote machine

This is the install i used - linux-nrpe-agent-el4.tar.gz

./fullinstall

What OS and version are you running on the remote machine?

Linux version 2.6.32-131.0.15.el6.x86_64 (mockbuild@x86-007.build.bos.redhat.com) (gcc version 4.4.4 20100726 (Red Hat 4.4.4-13) (GCC) ) #1 SMP Tue May 10 15:42:40 EDT 2011
[root@app-dev xinetd.d]#

For RHEL/CentOS 5-6 (el5 & el6) the install file should be: Detailed install instructions may be found here
Installing_The_xi_Linux_Agent