Hi there, All I can suggest is: 1. "cd /etc/nagios3/conf.d; grep -r check_dns *" and see if the command definition appears twice anywhere; 2. Vet your nagios.cfg carefully and make sure you're not inadvertently including the same file twice, files from somewhere else etc.; and 3. Deleting the lines around the definition of the check_dns command, and the command definition itself, and retyping it manually (to make sure no strange characters have found their way in there somewhere). You've probably done the equivalent of all those already, but that's all I can think of... Cheers, Guy. <div class="gmail_quote">On Mon, Jun 22, 2009 at 12:55 PM, Kaplan, Andrew H. <<a href="mailto:AHKAPLAN@partners.org">AHKAPLAN@partners.org</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Hi there-- I am reposting this question due to a lack of response. I really am in need of help here, and any would be greatly appreciated. Thanks. I have completed the installation of Nagios 3.0.6 onto an Ubuntu 9.04 server using the apt-get utility. We currently have a Nagios 2.6 server running, and I wanted to import the configuration files into the newer server. To that end, I have placed the appropriate configuration files in the /etc/nagios3/conf.d directory, and modified the nagios.cfg file to reflect the location of the configuration files. I ran the preflight check and the following error message appeared on-screen: /usr/sbin/nagios3 -v /etc/nagios3/nagios.cfg Nagios 3.0.6 Copyright (c) 1999-2008 Ethan Galstad (<a href="http://www.nagios.org" target="_blank">http://www.nagios.org</a>) Last Modified: 12-01-2008 License: GPL Reading configuration data... Warning: Duplicate definition found for command 'check_dns' (config file '/etc/nagios3/conf.d/commands.cfg', starting on line 90) Error: Could not add object property in file '/etc/nagios3/conf.d/commands.cfg' on line 91. ***> One or more problems was encountered while processing the config files... Check your configuration file(s) to ensure that they contain valid directives and data defintions. If you are upgrading from a previous version of Nagios, you should be aware that some variables/definitions may have been removed or modified in this version. Make sure to read the HTML documentation regarding the config files, as well as the 'Whats New' section to find out what has changed. I checked the commands.cfg, and several other files, and I do not see where the duplicate definition is occurring. Can someone lend a hand on this? Thanks. -----Original Message----- From: Kaplan, Andrew H. Sent: Friday, June 19, 2009 4:52 PM To: <a href="mailto:nagios-users@lists.sourceforge.net">nagios-users@lists.sourceforge.net</a> Subject: [Nagios-users] Problem in Preflight Check with commands.cfg Hi there -- I have completed the installation of Nagios 3.0.6 onto an Ubuntu 9.04 server using the apt-get utility. We currently have a Nagios 2.6 server running, and I wanted to import the configuration files into the newer server. To that end, I have placed the appropriate configuration files in the /etc/nagios3/conf.d directory, and modified the nagios.cfg file to reflect the location of the configuration files. I ran the preflight check and the following error message appeared on-screen: /usr/sbin/nagios3 -v /etc/nagios3/nagios.cfg Nagios 3.0.6 Copyright (c) 1999-2008 Ethan Galstad (<a href="http://www.nagios.org" target="_blank">http://www.nagios.org</a>) Last Modified: 12-01-2008 License: GPL Reading configuration data... Warning: Duplicate definition found for command 'check_dns' (config file '/etc/nagios3/conf.d/commands.cfg', starting on line 90) Error: Could not add object property in file '/etc/nagios3/conf.d/commands.cfg' on line 91. ***> One or more problems was encountered while processing the config files... Check your configuration file(s) to ensure that they contain valid directives and data defintions. If you are upgrading from a previous version of Nagios, you should be aware that some variables/definitions may have been removed or modified in this version. Make sure to read the HTML documentation regarding the config files, as well as the 'Whats New' section to find out what has changed. I checked the commands.cfg, and several other files, and I do not see where the duplicate definition is occurring. Can someone lend a hand on this? Thanks. The information in this e-mail is intended only for the person to whom it is addressed. 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Register today! <a href="http://ad.doubleclick.net/clk;215844324;13503038;v?http://opensourcebridge.org" target="_blank">http://ad.doubleclick.net/clk;215844324;13503038;v?http://opensourcebridge.org</a> _______________________________________________ Nagios-users mailing list <a href="mailto:Nagios-users@lists.sourceforge.net">Nagios-users@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/nagios-users" target="_blank">https://lists.sourceforge.net/lists/listinfo/nagios-users</a> ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null </blockquote></div>