Nagios is a great product for monitoring IT infrastructure. Since it is an open source product, users can develop there own plugins to monitor what ever parameter they like to monitor.
Different plugins may use different addons to be installed for them to work correctly. I used a script to check SVN port 8443 status, if it is open or not. It gave me this error after first start:
Resolution to this is installation of Perl’s Module Time-HighRes. On RHEL/CentOS/Fedora, this can be done by:
# service nagios restart
# systemctl restart httpd.service (maybe this command is not required at all)
Now, Nagios is working correctly with port status check script.