How to Use the Configure Passive Checks Wizard in Nagios XI

Nagios XI includes a Configure Passive Checks wizard that enables you to easily accept check results from external systems and quickly configure passive host/service definitions, freshness thresholds, result processing (NRDP/NSCA), and notification behavior.

You can also refer to this documentation for full details:

Here is a direct link to the PDF as well:

Configuring-Passive-Services-With-Nagios-XI