Rafa MB on "[Plugin: iThemes Security (formerly Better WP Security)] admin-ajax.php call as forbidden (403)"

Hi, when my homepage is trying to call admin-ajax.php which I use to populate a photoslider, I'm getting a 403 (forbidden) when I'm not logged since I activated this plugin.

Am I the only one with this kind of problem?
Thanks in advance.

https://wordpress.org/plugins/better-wp-security/