after i installed nginx & php-fpm, i run my website on browser, it showed 403 Forbidden (nginx/1.6.3). Then i check my error log. i showed me error: "....../index.php" is forbidden (13: Permission denied).

After that I changed index.php file to 777 for both root and nginx user but it always show forbidden error.

Could you please help me to explain how should i check? Thanks