Nagios: Error: Could not open command file '/usr/local/nagios/var/rw/nagios.cmd' for update!

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http://rtfm.co.ua/wp-content/uploads/2014/12/nagios_logo-e1417432364543.jpg Nagios: Error: Could not open command file '/usr/local/nagios/var/rw/nagios.cmd' for update!
При отправке уведомления - Nagios сообщает об ошибке:
Error: Could not open command file ‘/usr/local/nagios/var/rw/nagios.cmd’ for update!

The permissions on the external command file and/or directory may be incorrect. Read the FAQs on how to setup proper permissions.

An error occurred while attempting to commit your command for processing

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