Host notifcations not being sent

[niebais]

Red Hat Enterprise Linux Server release 7.4 (Maipo)
Nagios XI 5.4.10

We're having an issue where no Host Problem notifications are being sent out. The other emails, such as services, are being sent. I've been through the host template settings (xiwizard_generic_host). It appears to be sending out all notifications and it is set to 24x7 for notification times to be sent out.

I've verified that I can send email directly through the smtp relay settings using a telnet connection to the port and the emails go out fine. I know I have the correct settings in the email settings tab as well.

[dwasswa]

In the upper right corner of the home page, please click on nagiosadmin (or whatever user you are logged in as) >> Notifications Preferences and send me a snapshot of that page.

I am asking this because under Email tab, you need to make sure that options Host down, Host unreachable etc. is clicked depending on what you want.

Notification-Preferences.PNG

Secondly, on the Host management page for that host under CCM, please make sure you have Notifications enabled is set to on.

HostManagement.PNG

Please see attachments for examples.

[niebais]

This is the template I created by copying xiwizard_generic_host and naming is xiwizard_camera_host

host_template_management.PNG

These are the notification preferences

notification_preferences_1.PNG

For the single host (there are 5000 hosts with the same problem), here is an example of one I changed.

single_host_management.PNG

[niebais]

Also, as an update, no user gets the host down notifications on all 5000 systems.

[kyang]

Anything significant showing in your maillogs?

Code: Select all

tail -50 /var/log/maillog

OR

Since it's SMTP, have you tried debugging?

Code: Select all

tail -50 /usr/local/nagiosxi/tmp/phpmailer.log

When did host notifications stop working?

[lmiltchev]

niebais, what is the check_interval set at for these hosts? Even if you had the notification_interval set at 1 min, the notifications won't go out every 1 min if the check_interval is larger than the notification_interval...

Here's an example from one of my test boxes:

Code: Select all

define host {
	host_name			192.168.18.51
	use				xiwizard_genericnetdevice_host
	address				192.168.18.51
	max_check_attempts		5
	check_interval			5
	retry_interval			1
	check_period			xi_timeperiod_24x7
	contacts			nagiosadmin
	notification_interval		1
	notification_period		xi_timeperiod_24x7
	notifications_enabled		1
	icon_image			network_node.png
	statusmap_image			network_node.png
	_xiwizard			genericnetdevice
	register			1
	}

This hosts is configured with notification_interval = 1 min, but nagios won't be sending a new notifications before it checks if the host (in 5 min) to see if the state changed.

Here's the actual notifications I received:

example01.PNG

As you can see, the notifications are sent every 5 min.

Note: Having said that, I would not recommend setting the check_interval to 1 min for all 5000 hosts! Please review our document on maximizing performance in Nagios XI here:

https://assets.nagios.com/downloads/nag ... ios-XI.pdf

Back to the issue at hand - I have seen similar problems in the past caused by customized notification handlers. Can you post the "xi_host_notification_handler" command, and a "sample" config of a host, along with all relevant contacts, templates, etc.?

[niebais]

Go ahead and close this one down. The main issue found was with the email servers we were working with. Also, the host_notification time was temporarily set to 1 to test the system out and is usually set to 60 or higher.