Hi Everyone I have just installed Nagios Core 3.2.3 with nagios-plugins-1.4.15 on CentOS 5.6 with SE Linux Disabled by following the Fedora Quick start guide (so nagios is installed from source rather than an RPM) And from the default install perspective everything looks good. But I have just to add my first remote host and things dont seem to be working as I expect. I created a new file /usr/local/nagios/etc/objects/cms-core.cfg owner nagios group nagios with the appropriate permissions and added cfg_file=/usr/local/nagios/etc/objects/cms-core.cfg to /usr/local/nagios/etc/nagios.cfg I then added the following content to the file define hostgroup{ hostgroup_name core-servers alias Infrastructure members inf1 } define host{ host_name inf1 alias <a href="http://inf1.cms.waikato.ac.nz">inf1.cms.waikato.ac.nz</a> address 130.217.208.181 check_command check-host-alive check_interval 5 retry_interval 1 max_check_attempts 5 check_period 24x7 process_perf_data 1 retain_nonstatus_information 1 contact_groups admins notification_interval 30 notification_period 24x7 notification_options d,u,r } define service{ use generic-service hostgroup_name core-servers service_description PING contact_groups admins check_command check_ping!500.0,20%!800.0,60% } I then run the config test command /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg The output is below Nagios Core 3.2.3 Copyright (c) 2009-2010 Nagios Core Development Team and Community Contributors Copyright (c) 1999-2009 Ethan Galstad Last Modified: 10-03-2010 License: GPL Website: <a href="http://www.nagios.org">http://www.nagios.org</a> Reading configuration data... Read main config file okay... Processing object config file '/usr/local/nagios/etc/objects/commands.cfg'... Processing object config file '/usr/local/nagios/etc/objects/contacts.cfg'... Processing object config file '/usr/local/nagios/etc/objects/timeperiods.cfg'... Processing object config file '/usr/local/nagios/etc/objects/templates.cfg'... Processing object config file '/usr/local/nagios/etc/objects/localhost.cfg'... Processing object config file '/usr/local/nagios/etc/objects/cms-core.cfg'... Read object config files okay... Running pre-flight check on configuration data... Checking services... Checked 9 services. Checking hosts... Checked 2 hosts. Checking host groups... Checked 2 host groups. Checking service groups... Checked 0 service groups. Checking contacts... Checked 1 contacts. Checking contact groups... Checked 1 contact groups. Checking service escalations... Checked 0 service escalations. Checking service dependencies... Checked 0 service dependencies. Checking host escalations... Checked 0 host escalations. Checking host dependencies... Checked 0 host dependencies. Checking commands... Checked 24 commands. Checking time periods... Checked 5 time periods. Checking for circular paths between hosts... Checking for circular host and service dependencies... Checking global event handlers... Checking obsessive compulsive processor commands... Checking misc settings... Total Warnings: 0 Total Errors: 0 Things look okay - No serious problems were detected during the pre-flight check I then restart the web server, expecting to see a new host inf1 But the host count has not increased and I can't see any reference to the host. I also can not see the new host group I defined. So obviously I am missing something fundamental. Thanks for any incite you care to share :)