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###############################################################################
#
# Host configuration file
#
# Created by: Nagios Core Config Manager 2.2.2
# Date: 2014-10-13 15:59:49
# Version: Nagios 3.x config file
#
# --- DO NOT EDIT THIS FILE BY HAND ---
# Nagios CCM will overwrite all manual settings during the next update if you
# would like to edit files manually, place them in the 'static' directory or
# import your configs into the CCM by placing them in the 'import' directory.
#
###############################################################################

define host {
host_name mg1
use xiwizard_mailserver_host
address 10.0.11.87
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
icon_image mailserver.png
statusmap_image mailserver.png
_xiwizard mailserver
register 1
}

###############################################################################
#
# Host configuration file
#
# END OF FILE
#
###############################################################################

###############################################################################
#
# Service configuration file
#
# Created by: Nagios Core Config Manager 2.2.2
# Date: 2014-10-13 16:00:52
# Version: Nagios 3.x config file
#
# --- DO NOT EDIT THIS FILE BY HAND ---
# Nagios CCM will overwrite all manual settings during the next update if you
# would like to edit files manually, place them in the 'static' directory or
# import your configs into the CCM by placing them in the 'import' directory.
#
###############################################################################

define service {
host_name mg1
service_description / Disk Usage
use xiwizard_nrpe_service
check_command check_nrpe!check_disk!-a '-w 20% -c 10% -p /'
max_check_attempts 5
check_interval 5
retry_interval 1
check_period xi_timeperiod_24x7
notification_interval 60
notification_period xi_timeperiod_24x7
contacts nagiosadmin
_xiwizard linux-server
register 1
}

define service {
host_name mg1
service_description APT Updates
use xiwizard_nrpe_service
check_command check_nrpe!check_apt!-a '-U'
max_check_attempts 5
check_interval 5
retry_interval 1
check_period xi_timeperiod_24x7
notification_interval 60
notification_period xi_timeperiod_24x7
contacts nagiosadmin
_xiwizard linux-server
register 1
}

define service {
host_name mg1
service_description Blacklist Status
use xiwizard_mailserver_service
check_command check_mailserver_rbl!-B zen.spamhaus.org bl.spamcop.net dnsbl.ahbl.org dnsbl.njabl.org dnsbl.sorbs.net virbl.dnsbl.bit.nl rbl.efnet.org phishing.rbl.msrbl.net 0spam.fusionzero.com list.dsbl.org multihop.dsbl.org unconfirmed.dsbl.org will-spam-for-food.eu.org blacklist.spambag.org blackholes.brainerd.net blackholes.uceb.org spamsources.dnsbl.info map.spam-rbl.com ns1.unsubscore.com psbl.surriel.com l2.spews.dnsbl.sorbs.net bl.csma.biz sbl.csma.biz dynablock.njabl.org no-more-funn.moensted.dk ubl.unsubscore.com dnsbl-1.uceprotect.net dnsbl-2.uceprotect.net dnsbl-3.uceprotect.net spamguard.leadmon.net opm.blitzed.org bl.spamcannibal.org rbl.schulte.org dnsbl.ahbl.org virbl.dnsbl.bit.nl combined.rbl.msrbl.net
max_check_attempts 5
check_interval 5
retry_interval 1
check_period xi_timeperiod_24x7
notification_interval 60
notification_period xi_timeperiod_24x7
contacts nagiosadmin
_xiwizard mailserver
register 1
}

define service {
host_name mg1
service_description CPU Stats
use xiwizard_nrpe_service
check_command check_nrpe!check_cpu_stats!-a '-w 85 -c 95'
max_check_attempts 5
check_interval 5
retry_interval 1
check_period xi_timeperiod_24x7
notification_interval 60
notification_period xi_timeperiod_24x7
contacts nagiosadmin
_xiwizard linux-server
register 1
}

define service {
host_name mg1
service_description Cron Scheduling Daemon
use xiwizard_nrpe_service
check_command check_nrpe!check_init_service!-a 'cron'
max_check_attempts 5
check_interval 5
retry_interval 1
check_period xi_timeperiod_24x7
notification_interval 60
notification_period xi_timeperiod_24x7
contacts nagiosadmin
_xiwizard linux-server
register 1
}

define service {
host_name mg1
service_description IMAP
use xiwizard_imap_service
check_command check_xi_service_imap!-j
max_check_attempts 5
check_interval 5
retry_interval 1
check_period xi_timeperiod_24x7
notification_interval 60
notification_period xi_timeperiod_24x7
contacts nagiosadmin
_xiwizard mailserver
register 1
}

define service {
host_name mg1
service_description Load
use xiwizard_nrpe_service
check_command check_nrpe!check_load!-a '-w 15,10,5 -c 30,20,10'
max_check_attempts 5
check_interval 5
retry_interval 1
check_period xi_timeperiod_24x7
notification_interval 60
notification_period xi_timeperiod_24x7
contacts nagiosadmin
_xiwizard linux-server
register 1
}

define service {
host_name mg1
service_description Memory Usage
use xiwizard_nrpe_service
check_command check_nrpe!check_mem!-a '-w 20 -c 10'
max_check_attempts 5
check_interval 5
retry_interval 1
check_period xi_timeperiod_24x7
notification_interval 60
notification_period xi_timeperiod_24x7
contacts nagiosadmin
_xiwizard linux-server
register 1
}

define service {
host_name mg1
service_description Open Files
use xiwizard_nrpe_service
check_command check_nrpe!check_open_files!-a '-w 30 -c 50'
max_check_attempts 5
check_interval 5
retry_interval 1
check_period xi_timeperiod_24x7
notification_interval 60
notification_period xi_timeperiod_24x7
contacts nagiosadmin
_xiwizard linux-server
register 1
}

define service {
host_name mg1
service_description Ping
use xiwizard_mailserver_ping_service,xiwizard_linuxserver_ping_service
max_check_attempts 5
check_interval 5
retry_interval 1
check_period xi_timeperiod_24x7
notification_interval 60
notification_period xi_timeperiod_24x7
contacts nagiosadmin
_xiwizard linux-server
register 1
}

define service {
host_name mg1
service_description POP
use xiwizard_pop_service
check_command check_xi_service_pop!-j
max_check_attempts 5
check_interval 5
retry_interval 1
check_period xi_timeperiod_24x7
notification_interval 60
notification_period xi_timeperiod_24x7
contacts nagiosadmin
_xiwizard mailserver
register 1
}

define service {
host_name mg1
service_description SMTP
use xiwizard_smtp_service
max_check_attempts 5
check_interval 5
retry_interval 1
check_period xi_timeperiod_24x7
notification_interval 60
notification_period xi_timeperiod_24x7
contacts nagiosadmin
_xiwizard mailserver
register 1
}

define service {
host_name mg1
service_description SSH Server
use xiwizard_nrpe_service
check_command check_nrpe!check_init_service!-a 'ssh'
max_check_attempts 5
check_interval 5
retry_interval 1
check_period xi_timeperiod_24x7
notification_interval 60
notification_period xi_timeperiod_24x7
contacts nagiosadmin
_xiwizard linux-server
register 1
}

define service {
host_name mg1
service_description Swap Usage
use xiwizard_nrpe_service
check_command check_nrpe!check_swap!-a '-w 50 -c 20'
max_check_attempts 5
check_interval 5
retry_interval 1
check_period xi_timeperiod_24x7
notification_interval 60
notification_period xi_timeperiod_24x7
contacts nagiosadmin
_xiwizard linux-server
register 1
}

define service {
host_name mg1
service_description Total Processes
use xiwizard_nrpe_service
check_command check_nrpe!check_procs!-a '-w 150 -c 250'
max_check_attempts 5
check_interval 5
retry_interval 1
check_period xi_timeperiod_24x7
notification_interval 60
notification_period xi_timeperiod_24x7
contacts nagiosadmin
_xiwizard linux-server
register 1
}

define service {
host_name mg1
service_description Users
use xiwizard_nrpe_service
check_command check_nrpe!check_users!-a '-w 5 -c 10'
max_check_attempts 5
check_interval 5
retry_interval 1
check_period xi_timeperiod_24x7
notification_interval 60
notification_period xi_timeperiod_24x7
contacts nagiosadmin
_xiwizard linux-server
register 1
}

###############################################################################
#
# Service configuration file
#
# END OF FILE
#
###############################################################################

Thanks for that.

Lets test the command that Nagios is using which is currently causing a critical status:

From the command line:
What result does this produce?

[root@nagios ~]# /usr/local/nagios/libexec/check_icmp -H 10.0.11.87 -w 3000.0,80% -c 5000.0,100% -p 5
CRITICAL - 10.0.11.87: rta nan, lost 100%|rta=0.000ms;3000.000;5000.000;0; pl=100%;80;100;; rtmax=0.000ms;;;; rtmin=0.000ms;;;;

What is the version of the plugin that you are using?
Do you get "Critical" as well if you use "check_ping" instead?

[root@nagios libexec]# ./check_icmp -V
check_icmp v2.0.2 (nagios-plugins 2.0.2)
[root@nagios libexec]# /usr/local/nagios/libexec/check_ping -H 10.0.11.87 -w 3000.0,80% -c 5000.0,100% -p 5
PING OK - Packet loss = 0%, RTA = 0.64 ms|rta=0.639000ms;3000.000000;5000.000000;0.000000 pl=0%;80;100;0

I'm assuming my firewall is blocking something, but I was under the impression that ping uses icmp? I have a Cisco ASA 5510 firewall, what do I need to allow through?

http://danxlog.blogspot.com/2011/02/che ... -vpns.html

This explains the difference between the two:

Sometimes happens that your host is down and check_ping doesn't generate an alert notification, but why?

Many of you may know that check_ping is just a nagios wrapper to the ping command while check_icmp makes the control itself, but this is not the only difference. This kind of issue usually happens when involves host monitoring over vpn's.

If an host is down over a vpn the result for a missing icmp echo will be "ping timeout" instead of the usual "host unreachable" if that host was in the same network. For this reason, Nagios will interpret the timeout as a soft error and will not generate the notification.

Instead, using the check_icmp will generate a hard error and so the notification will occur.

I strongly advertise to use check_ping on local networks monitoring only, while check_icmp if you monitor hosts over vpns.

To replace the command, just open command.cfg and at the section check-host-alive, just replace check_ping with check_icmp.

Does this help?

These hosts are actually not over a vpn, just on different networks. mg1 is in the DMZ and nagios is in the main network. Also, I monitor a lot of hosts over VPN and they all work fine.

I have a rule allowing ICMP packets through the DMZ to nagios, are there any other ports/protocols that need forwarded?

I think it's probably simplest to change your check to check_ping as that seems to be working.

I don't understand why check_icmp is not working as check_ping is technically the same thing but the way the work are different (which I don't know the exact differences).

Since this host is part of a template, what do I do to change to ping for this host?

Simply change the host object directly, select the check_ping "Check command" and define the values as per this screenshot. They will override the template.