Nagios Core not reading config file

[juanmaa1414]

Hi everyone. I've installed Nagios Core on my gnu/linux machine by following entirely the Quickstart Guide (ubuntu dist page), and I don't can run it via #/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg so this return this error:

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Nagios Core 4.1.1
Copyright (c) 2009-present Nagios Core Development Team and Community Contributors
Copyright (c) 1999-2009 Ethan Galstad
Last Modified: 08-19-2015
License: GPL

Website: https://www.nagios.org
Reading configuration data...
Error: Cannot open main configuration file '/usr/local/nagios/etc/nagios.cfg' for reading!
   Error processing main config file!

-Under Slackware 14.0 x64 with Apache/2.4.3. It's my 3rd attempt. The nagios.cfg is here:

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ls -la /usr/local/nagios/etc 
total 76
drwxrwxr-x 3 nagios nagios  4096 Jun 22 10:23 ./
drwxr-xr-x 9 root   root    4096 Jun 22 10:30 ../
-rw-rw-r-- 1 nagios nagios 12267 Jun 22 10:12 cgi.cfg
-rw-r--r-- 1 root   root      50 Jun 22 10:23 htpasswd.users
-rw-rw-r-- 1 nagios nagios 44831 Jun 22 10:12 nagios.cfg
drwxrwxr-x 2 nagios nagios  4096 Jun 22 10:12 objects/
-rw-rw---- 1 nagios nagios  1312 Jun 22 10:12 resource.cfg

Thanks.

[tgriep]

Can you run the verification like below with the extra output and see if there are more details on the error?

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/usr/local/nagios/bin/nagios -vv /usr/local/nagios/etc/nagios.cfg

Is selinux installed and enabled on the system? That could cause the error.
Run this to see if it is enabled,If it is enabled, you need to disable it.

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getenforce

Is the /usr/local/nagios folder and it's sub folders readable by the nagios user and the nagios group?