Van, Your service definition arguments do not match your command definition expected arguments. In your command definition you pass to the check_url_status command only 3 Variables, HOSTADDRESS, ARG1, ARG2. In your service definition, you have 4 Arguments plus the HOSTADDRESS variable. This is what the check_url_status command is receiving: check_url_status localhost -U URL If you need the additional 2 arguments, add an $ARG3$ $ARG4$ Every " ! " in your service check_command definition is passed as an "$ARG#$" argument to the actual command. Hope that help! -Philip <div class="gmail_quote">On Thu, May 21, 2009 at 5:38 AM, Evans Plummer <<a href="mailto:evans.plummer@usis.com">evans.plummer@usis.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div> Morning, I am using the "check_url_status" plugin and receiving the above mentioned error. Below is the command and service definition info. Can anyone tell me why I am receiving this message? Thanks in advance! # 'check_url_status' command definition define command{ command_name check_url_status command_line $USER1$/check_url_status $HOSTADDRESS$ $ARG1$ $ARG2$ } define service{ use local-service ; Name of service template to use host_name localhost service_description URL_STATUS check_command check_url_status!-U!URL!--http-user=someuser!--http-passwd=somepassword } Van <div><hr> The information contained in and transmitted with this e-mail is confidential. It is intended only for the individual or entity designated above. You are hereby notified that any dissemination, distribution, copying or use of or reliance on the information contained in and transmitted with this e-mail by or to anyone other than the recipient designated above by the sender is unauthorized and strictly prohibited. If you have received this e-mail in error, please contact the sender immediately and notify them that you received this in error. Any e-mail erroneously transmitted to you should be immediately destroyed. Thank you for your attention to this note of confidentiality. </div> </div> ------------------------------------------------------------------------------ Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp asthey present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. <a href="http://www.creativitycat.com" target="_blank">http://www.creativitycat.com</a> _______________________________________________ Nagiosplug-help mailing list <a href="mailto:Nagiosplug-help@lists.sourceforge.net">Nagiosplug-help@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/nagiosplug-help" target="_blank">https://lists.sourceforge.net/lists/listinfo/nagiosplug-help</a> ::: Please include plugins version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null </blockquote></div>