I have a working icinga monitoring system running on RHEL 7. While executing “check now” from icingaweb, I get the below error irrespective if the host is up or down.
information/ExternalCommandListener: Executing external command:  SCHEDULE_FORCED_HOST_CHECK;
warning/ExternalCommandListener: External command failed: Error: Cannot reschedule forced host check for non-existent host
Could someone help me understand/troubleshoot this?