Error Establishing a Database Connection in WordPress

"To Fix ""Error Establishing a Database Connection in WordPress"": Open wp-config.php file and double check the value of below constants. define('DB_NAME', 'your_database_name'); define('DB_USER', 'your_database_username'); define('DB_PASSWORD', 'your_database_password'); define('DB_HOST', 'loca

define('DB_NAME', 'your_database_name'); 
define('DB_USER', 'your_database_username'); 
define('DB_PASSWORD', 'your_database_password'); 
define('DB_HOST', 'localhost'); // sometimes it can be anything else like IP address