Hi, I installed Nagios and plugins also by going through the documentation. I installed Nagios 2.10 and Nagios Plugins 1.4.11 But, the problem is when i tried to run nagios in debug mode using the command /usr/local/nagios/bin/nagios –v /usr/local/nagios/etc/init.d/nagios.cfg It resulted in an error. I installed Nagios in redhat linux enterprise edition. And one more thing that i observed after installing Plugins is, The configuration files i got in the etc directory are not named sample. Is there anything to with this. Can any one help me out in this regard.... Nagios 2.10 Copyright (c) 1999-2007 Ethan Galstad (<a href="http://www.nagios.org">http://www.nagios.org</a>) Last Modified: 10-21-2007 License: GPL Error: Cannot open main configuration file '/usr/local/nagios/etc/–v' for reading! Warning: Cannot open log file '/usr/local/nagios/var/nagios.log' for writing Nagios 2.10 starting... (PID=4566) Warning: Cannot open log file '/usr/local/nagios/var/nagios.log' for writing Warning: Cannot open log file '/usr/local/nagios/var/nagios.log' for writing Bailing out due to one or more errors encountered in the configuration files. Run Nagios from the command line with the -v option to verify your config before restarting. (PID=4566)