PHP Warning require once var www html wp-config php failed to open stream Permission denied in var www html wp-load php on line 37

Question

I am creating an Wordpress app server on apache and I am getting an error 500 while going to the url.So, I did check the httpd/logs/error_log and the following is the error

[Sun Jan 15 22:42:54.440349 2017] [:error] [pid 767] [client 10.203.116.148:9173] PHP Warning: require_once(/var/www/html/wp-config.php): failed to open stream: Permission denied in /var/www/html/wp-load.php on line 37 [Sun Jan 15 22:42:54.440406 2017] [:error] [pid 767] [client 10.203.116.148:9173] PHP Fatal error: require_once(): Failed opening required '/var/www/html/wp-config.php' (include_path='.:/usr/share/pear:/usr/share/php') in /var/www/html/wp-load.php on line 37

I tried changing the file permissions for Wp-config.php but no luck, is there anything else I could do.