I am trying to monitor 3 exchange server and combined them with check_cluster to report if there was any issue with them or not. If any of my exchange server is down then my check_cluster should report down. So I have 3 individual exchange checks as listed below define service { use use-standard host_name EXCHANGE1.com service_description executive_exchange_check servicegroups exchangecheck check_command check_email_service!nagios-ex1!something!pasword contact_groups standard } define service { use use-standard host_name EXCHANGE2.com service_description executive_exchange_check servicegroups exchangecheck check_command check_email_service!nagios-ex2!something!password+ contact_groups standard } define service { use use-standard host_name EXCHANGE3.com service_description executive_exchange_check servicegroups exchangecheck check_command check_email_service!nagios-ex3!something!password contact_groups standard } Now I have the following check_cluster check. define service { use standard service_description exchangestatus servicegroups Executive_dashboard check_command check_cluster_service!"exchangecheck"!0:0!0:0!$SERVICESTATEID:CUIT-EXCHANGE1.com:executive_exchange_check,$SERVICESTATEID:CUIT-EXCHANGE2.com:executive_exchange_check,$SERVICESTATEID:CUIT-EXCHANGE3.com:executive_exchange_check$ contact_groups atg } First, my cluster check "exchangestatus" . does it need any association with any hostgroup? I want "Executive_dashboard" servicegroup to show only one "exchangestatus" check not three. I set the warnning and critical to be 0:0 and 0:0. I want anything but "OK" state to alert me. Is my threshold setting correct? Please advise on this. Thanks -- Cordially, Shadhin Rahman