socket timeout after 30 seconds

[iroy]

CHECK_NRPE: Socket timeout after 30 seconds

When I am applying config changes, I am getting above message for the remote server.

I have 2 servers (A & B) and have nagiosxi on installed both.

I'm using the nagiosxi servers to monitor each other, meaning A monitors B and B monitors A.

Above error message is happening for B monitoring A for services like Total Processes; the only service that is responding correctly is Ping.

A monitoring B is not even kicking in.

[lmiltchev]

Is xinetd running on both servers? Did you add the servers' IPs to the "/etc/xinetd.d/nrpe" file ("only_from" line)? Can you show us an example of a check, run from the command line, along with the output of it? Example:

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[root@localhost libexec]# /usr/local/nagios/libexec/check_nrpe -H <client ip> -c check_users -a '-w 2 -c 5'
USERS OK - 1 users currently logged in |users=1;2;5;0

[iroy]

thanks lmiltchev.

root@vps-cl0:/etc/xinetd.d# /usr/local/nagios/libexec/check_nrpe -H 192.168.1.24 -t 30 -c check_users -a -w 5 -c 10
CHECK_NRPE: Socket timeout after 30 seconds.

Is this how i modify /etc/xinetd.d/nrpe:
only_from = 127.0.0.1, 192.168.1.24
# 192.168.1.24 is the remote server

And for the change to take effect do I have to reboot the server or just restart nagios.

[lmiltchev]

Is this how i modify /etc/xinetd.d/nrpe:
only_from = 127.0.0.1, 192.168.1.24
# 192.168.1.24 is the remote server

Actually, no. The IPs must be space separated, not comma separated. You should have:

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only_from = 127.0.0.1 192.168.1.24

And for the change to take effect do I have to reboot the server or just restart nagios.

No, you need to restart xinetd.

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service xinetd restart

Let us know if this helped. Thanks!

[iroy]

ok i restarted xinetd after entering the other ip in /etc/xinetd.d/nrpe and it ran to check on the other host.
However it is telling me that the host is down when the host is actually up.

[lmiltchev]

Can you show us the actual check that is failing run from the command line along with the output of it?


It is possible that your firewall is blocking port 5666. What is the output of the following commands?

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/usr/local/nagios/libexec/check_nrpe -H <client ip>
nmap <client ip> -p 5666

[iroy]

root@vps-cl2:/etc/xinetd.d# /usr/local/nagios/libexec/check_nrpe -H 192.168.1.22 nmap 192.168.1.22 -p 5666 -t 30
CHECK_NRPE: Socket timeout after 30 seconds.

[iroy]

Here is the config for monitoring the host. there is no firewall between the servers.

define host {
host_name 192.168.1.22
use xiwizard_website_host
address 192.168.1.22
max_check_attempts 5
check_interval 5
retry_interval 1
check_period xi_timeperiod_24x7
contacts nagiosadmin
notification_interval 60
notification_period xi_timeperiod_24x7
notifications_enabled 1
icon_image www_server.png
statusmap_image www_server.png
_xiwizard websiteurl
register 1
}

[tgriep]

The server at IP address 192.168.1.23, can you login as root, run the following commands and post the output?

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netstat -an
service iptables status
service firewalld status
ps -ef --cols=300
cat /etc/xinetd.d/nrpe

Then do the same on the other server and post that as well.

Thanks

[iroy]

thanks tgriep; pls help.

Server 192.168.1.24 is alerting that server 192.168.1.22 is down.
Server 192.168.1.22 is also alerting that server 192.168.1.24 is down.

Nagiosxi is installed on both the servers.

Ran your commands on both 24 and 22 and the results are attached in pdf.

netstat -an
service iptables status
service firewalld status
cat /etc/xinetd.d/nrpe
ps -ef --cols=300