The error occurred Unexpected response code: 503.

Hello @shahrintech,

Please make sure you are using the latest version of our Security plugin. If not, please update it. The guide is here: https://cleantalk.org/help/update-wordpress-security

Then open the wp-config.php file. You can find it in your website folder. And add the following: define(‘SPBC_ALLOW_CURL_SINGLE’, true);

Usually it is added after WP_DEBUG.

Did it help?