This official documentation covers installing Nagios Core from source: https://support.nagios.com/kb/article/nagios-core-installing-nagios-core-from-source-96.html Many mainstream Linux flavors also offer packages for Nagios Core in their official repos, though many of them are still providing Nagio...

I tried to login to Nagiosxi home page but its prompting for credentials Nagios XI has it's own back-end authentication system that supersedes the app/web server. I'm not sure this implementation is valid unless authentication within Nagios XI has changed dramatically in the past year. This looks l...

A Twilio implementation I did:
viewtopic.php?f=7&t=50426&p=263738#p263738

This calls the ElasticSearch API, which isn't super different from the Nagios Log Server API:
https://github.com/mcapra/nagios-nlsexport

I have mailutils installed and when I do "which mail", I get the following: root@ftp:~# which mail /usr/bin/mail All this confirms is that the root user's shell has an appropriate link for the mail command to /usr/bin/mail . The Nagios Core daemon doesn't run in a shell and probably shoul...

Ports below 1024 are considered "privileged" in Linux. Did you follow the Nagios Log Server specific documentation for addressing this?
https://assets.nagios.com/downloads/nag ... Server.pdf

Unless you happen to be running ndoutils, and that database hasn't been overwritten, I'm pretty sure that data is gone.

You could probably parse some of that information out from the Nagios logs, but converting it to a proper retention.dat file would be a pain.

Can you post your nrpe.cfg file from the cPanel machine? Be sure to remove any potentially sensitive information before sharing it publicly. What process did you use to install NRPE on the cPanel machine? Did you follow any specific documentation? Can you share the output of ls -laht executed agains...

Relevant documentation: https://assets.nagios.com/downloads/nagios-log-server/docs/Alerting-On-Log-Events-With-Nagios-Log-Server.pdf ElasticSearch documents don't really have a concept of "lines" though. You can't simple say "grab line 3 of the message" unless you've broken out e...

Can anyone provide the reason how this is possible? It would 100% depend on how you specifically configured the checks as well as the plugins being used by your checks. A scenario: My host checks are using ICMP pings. My service checks are using check_nrpe. My network team begins blocking ICMP requ...