Nagios Support Forum

Hi,

My RHEL server is connected to Nagios server and it has running 14 services. All services status in Nagios server is showing as "CHECK_NRPE: Socket timeout after 20 seconds. "

Action done :
1. netstat -at | grep check_nrpe - Client side it's listening.

Kindly help me to resolve this.

I'd check out the common issues "timeout after n seconds" section here:

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

It was written more from XI's perspective, but it will still work fine for Core.

Thx for response slan

Let me know where i can get "configure" Tab on my nagios core home page.

You cannot get it in Core, as I was mentioning, the document was written for Nagios XI, but the changes you can make to commands, services, and generally everything mentioned in it, can be done with Core. The only thing is you need to do them manually with your .cfg files instead of using the web frontend that XI gives you.

Hi,

I made the changes but still the issue is existing.

I hope it might be any network issue. can you plz guide me to resolve this.

Is port 5666 open? Run the following commands from the CLI on the nagios server and show us the output:

Hi,
Below is the output.

[root@nagiosserver]# nmap -p 5666 10.174.16.11(client ip)

Starting Nmap 5.51 ( http://nmap.org ) at 2014-09-26 12:01 IST
mass_dns: warning: Unable to determine any DNS servers. Reverse DNS is disabled. Try using --system-dns or specify valid servers with --dns-servers
Nmap scan report for BUGZILLABCK (10.174.16.11)
Host is up (0.039s latency).
PORT STATE SERVICE
5666/tcp filtered nrpe

Nmap done: 1 IP address (1 host up) scanned in 0.54 seconds

Filtered generally means that nmap got a valid connection, but was rejected from any further communication. Do you have the nagios system added to the allowed_hosts directive in /etc/xinet.d/nrpe? If so, have you restarted xinetd (service xinetd restart)? Has this worked ever, or is this a new setup and you are still trying to get it working for the first time?

Hi,

cat /etc/xinetd.d/nrpe
# 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 = 127.0.0.1 192.168.30.38[NagiosServer]
}
[root@BUGZILLABCK ~]# service xinetd status
xinetd (pid 24981) is running...
[root@BUGZILLABCK ~]# service xinetd restart
Stopping xinetd: [ OK ]
Starting xinetd: [ OK ]
[root@BUGZILLABCK ~]# service xinetd status
xinetd (pid 5197) is running...

After performing above action also i am facing same issue. ******CHECK_NRPE: Socket timeout after 20 seconds.******

OK, that looks good for xinetd profile. How about iptables?