This article covers how to resolve the issue with Nagios XI that stops displaying the core configuration manager or the components inside the core configuration manager.
A quick way to see if this is the problem is to see if you experience the same issue using another web browser.
To fix this Nagios configuration Problem:
1. In the event of the the Core Config Manager not visible or components missing from the page, this generally relates to a proxy and the following steps may resolve this issue:
pear config-set http_proxy http://proxy:port
2. Make sure to change proxy:port to match your proxy server, example:
pear config-set http_proxy http://192.168.44.20:8080
3. Then execute the following:
pear install HTML_Template_IT
After performing these steps go back to CCM and see if it works.