Unable to launch Nagios Web GUI

[ymistry]

I have installed nagios-4.3.4 and nagios-plugins-2.2.1 on RHEL 7.2
Have followed Nagios Core installation procedure and there were no errors in between.
While launching Web GUI am getting error as- 'Could not open '' for reading'
httpd service is running, have changed user/group ownership to nagios for htpasswd.users file. Stopped firewall, but still same error.

[kyang]

Is Selinux disabled?

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getenforce

Is Nagios running?

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systemctl status nagios.service

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systemctl restart nagios.service

Try going back to the Web UI and see if it works?

If not, could you send us some of your logs?

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tail -50 /var/log/messages

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tail -50 /var/log/httpd/error_log