Either check you’re running Wordfence as it adds firewall rules to your .htaccess and can block that file from running regardless of dir/file permissions or add this to your wp-config.php file
define(‘CONCATENATE_SCRIPTS’, false ); // <———- ADD THIS LINE
/** Sets up WordPress vars and included files. */
require_once(ABSPATH . ‘wp-settings.php’);
Sorry that needs to be ABOVE
/** Sets up WordPress vars and included files. */
require_once(ABSPATH . ‘wp-settings.php’);
try this in your wp-config.php
define(‘CONCATENATE_SCRIPTS’, false );
Don’t know why it works but it just does !