<html><body>All I have read the documentation a number of times and either I am not getting it or it is not working. I have this host set below define host{ host_name beastie alias NFS Unix Server address 172.26.X.X check_command check-host-alive max_check_attempts 10 check_period 24x7 notification_interval 20 notification_period 24x7 parents Pix notification_options d,r,u contact_groups Admins } If I shutdown the network interface on the switch leading to this box nagios alerts on the host being down but it alerts on it every 10 minutes. If I think I understand the notification interval correctly hopefully this info will be enough for someone to point out what I have wrong here. # INTERVAL LENGTH # This is the seconds per unit interval as used in the # host/contact/service configuration files. Setting this to 60 means # that each interval is one minute long (60 seconds). Other settings # have not been tested much, so your mileage is likely to vary... interval_length=60 The service check interval for this host is normal_check_interval 5 Oh yeah I am running version 2.5 </body></html>