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Nagios Core 4.2.4
Copyright (c) 2009-present Nagios Core Development Team and Community Contributors
Copyright (c) 1999-2009 Ethan Galstad
Last Modified: 12-07-2016
License: GPL
Website: https://www.nagios.org
Reading configuration data...
Error: Cannot open main configuration file '/usr/local/nagios/etc/nagios' for reading!
Error processing main config file!
I don't know why it happened because I didn't change any users permission