Nagios Support Forum

You could be hitting limits for the number of open files a process is allowed to have, or the limit on the total number of files the system can have open.

Please provide the output from:
and

This sort of thing catches me out far too often!

I'm trying to make a habit of testing plugins like:
Also, you shouldn't be logged in as 'root', ideally!

Postfix is the default MTA in CentOS 6.5. I'm not sure how you might have installed it again! Still, the issue is Postfix is timing out trying to get to port 25 on a remote mail server, and that's normally network related (a firewall is stopping you).

tapp wrote: Nagios detected the host down at 18:24, but didn't send the notification until 09:00:

The host has "notification_period" set to "workhours" which by default is 0900-1700 Monday to Friday. This might explain what you're referring to here.

Hi PO How does your Nagios server send mail? Directly ("Sendmail" in Admin->Manage Email Settings), or through a relay ("SMTP" in Admin->Manage Email Settings)? You can have the MTA (local sendmail or the remote SMTP server) rewrite sender fields as the mail is sent - I may be ov...

All of the service configurations for each host are contained in /usr/local/nagios/etc/services/"HOSTNAME".cfg - these are plain text files, so if you're okay with tools like grep, knock yourself out (something like "grep -hi -B5 notes_url /usr/local/nagios/etc/services/* | grep -e &q...

So to setup the monitoring through Nagios, I need a Linux machine on which I need to install Nagios XI + MS SQL plugins. There's a pre-installed NagiosXI VM you can use (assuming you have a virtualized environment somewhere). Or perform a 'Minimal' installation of CentOS 6.5 , and manually install ...

Those errors smack of network issues to me - your Ping service is losing 100% of packets, which isn't good! Those 4 services for that machine are also "flapping" (switching between OK and not OK a lot), which may indicate a troublesome network connection to that machine.

That's the same version as ships in 2012R2.9, I think.

Time to start hacking the PHP then, I think.

According to this thread from a year ago, the check_openmanage plugin PHP template for graphing isn't compatible with the PNP4Nagios version in the latest (stable) NagiosXI. I don't see any mention of PNP4Nagios getting an upgrade in the 2014 release that's just gone Beta. Can anyone confirm if PNP4...