Opencart Filters requesting http and hanging site up – Plesk

I have an issue with my OpenCart install. I am currently using 2.0.3.1 on a dedicated server running Plesk.

I installed a Let’s Encrypt SSL certificate. The website is running great and I have no issues with OpenCart requesting unsecure pages except when I click on a filter in the category page. It just hangs.

This is the error I get via Chrome developer tools. I apologize for having to blur out the domain. It’s for a customer and i can’t release it.

Here is my catalog config.php:

// HTTP
define('HTTP_SERVER', 'http://www.xxxxx.com/');

// HTTPS
define('HTTPS_SERVER', 'https://www.xxxxx.com/');

// DIR
define('DIR_APPLICATION', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/catalog/');
define('DIR_SYSTEM', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/system/');
define('DIR_LANGUAGE', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/catalog/language/');
define('DIR_TEMPLATE', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/catalog/view/theme/');
define('DIR_CONFIG', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/system/config/');
define('DIR_IMAGE', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/image/');
define('DIR_CACHE', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/system/cache/');
define('DIR_DOWNLOAD', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/system/download/');
define('DIR_UPLOAD', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/system/upload/');
define('DIR_MODIFICATION', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/system/modification/');
define('DIR_LOGS', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/system/logs/');

// DB
define('DB_DRIVER', 'mysql');
define('DB_HOSTNAME', 'localhost');
define('DB_USERNAME', 'xxx');
define('DB_PASSWORD', 'xxx');
define('DB_DATABASE', 'xxx');
define('DB_PORT', '3306');
define('DB_PREFIX', 'oc_');

Here is the admin config.php:

    // HTTP
define('HTTP_SERVER', 'http://www.xxxxx.com/admin/');
define('HTTP_CATALOG', 'http://www.xxxxx.com/');

// HTTPS
define('HTTPS_SERVER', 'https://www.xxxxx.com/admin/');
define('HTTPS_CATALOG', 'https://www.xxxxx.com/');

// DIR
define('DIR_APPLICATION', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/admin/');
define('DIR_SYSTEM', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/system/');
define('DIR_LANGUAGE', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/admin/language/');
define('DIR_TEMPLATE', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/admin/view/template/');
define('DIR_CONFIG', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/system/config/');
define('DIR_IMAGE', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/image/');
define('DIR_CACHE', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/system/cache/');
define('DIR_DOWNLOAD', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/system/download/');
define('DIR_UPLOAD', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/system/upload/');
define('DIR_LOGS', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/system/logs/');
define('DIR_MODIFICATION', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/system/modification/');
define('DIR_CATALOG', '/var/www/vhosts/xxxxx.com/httpdocs/xxxxx/catalog/');

// DB
define('DB_DRIVER', 'mysql');
define('DB_HOSTNAME', 'localhost');
define('DB_USERNAME', 'xxx');
define('DB_PASSWORD', 'xxx');
define('DB_DATABASE', 'xxx');
define('DB_PORT', '3306');
define('DB_PREFIX', 'oc_');

I do not have an htaccess file setup, with the Plesk install I haven’t needed it.