Upgrading Nagios Core ===================== nagios-4.3.0 - 2017-02-21 ------------------------- If you use "corewindow", as in http://localhost/nagios?corewindow=www.somewhere.com note that this functionality has been disabled by default in this release. If you still want to use it, run ./configure with the parameter --enable-corewindow nagios-3.0 ---------- The HTML documentation covers what you need to know in order to upgrade from Nagios 2.x You can find the documentation in the following subdirectory: html/docs Make sure to read the following sections: - "What's New" (whatsnew.html) - "Upgrading Nagios" (upgrading.html)