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Hi dear friends,
I've written a simple guide to install nagios core (latest stable release 3.4.1) which contain also a section to help to solve the most common problems such as:
Forbidden you don't have permission to access /nagios/ on this server
Error: Could not open command file '/var/nagios/rw/nagios.cmd' for update
You don't receive any email notification and/or you are able to send email notification by command line