When you say "my APC PDUs report an error for this service", do you mean they report critical, unknown, or something else? <div class="gmail_quote">On Sun, Mar 27, 2011 at 2:45 PM, Peter Roddan <<a href="mailto:Peter.Roddan@sbsworldwide.com">Peter.Roddan@sbsworldwide.com</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div link="blue" vlink="purple" lang="EN-GB"><div>Hi Everyone, Apologies is this is a silly question or something I’ve missed, but I’ve been going round in circles for ages on this one!I’m trying to use Marius Rieder’s pearl script to check the status of some APC PDUs. I have the command working ok, but it’s the Nagios Commands that I’m failing on – it’s been a while since I set up our Nagios install, so I think I’ve some something wrong.I’m running Nagios Core 3.2.3, and I’m using the script from here <a href="http://oss.isg.inf.ethz.ch/nagiosplug/" target="_blank">http://oss.isg.inf.ethz.ch/nagiosplug/</a> If I log onto the nagios server as the nagios user, and run the command from the libexec folder (check_apc_pdu –H <address> -C public) I get the response : “OK: All Outlets ok. | load=25” I have put the following command definition in : # 'check_apc_pdu' command definition define command{command_name check_apc_pducommand_line $USER1$/<a href="http://check_apc_pdu.pl" target="_blank">check_apc_pdu.pl</a> -H $HOSTADDRESS$ -C public } And defined the following service define service{ use generic-service ; Inherit values from a template hostgroup_name apc ; The name of the host the service is associated with service_description check_apc ; The service description check_command check_apc_pdu ; The command used to monitor the service normal_check_interval 5 ; Check the service every 5 minutes under normal conditions retry_check_interval 1 ; Re-check the service every minute until its final/hard state is determined } However, my APC PDUs report an error for this service, with a status information of “(Null)”I’d be grateful for anyone who could point me in the right direction of where I’m going wrong. 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