I just installed SSL for my domain prestashop and visiting the site with https, is not working but with HTTP, it works. While the backend works with https://.
Can you upload a test HTML file to the website's document root (e.g. /home/username/public_html/) and verify if the SSL version of the website loads as expected when accessing the HTML file? If so, then it's likely an issue with how the script installed on the website is configured or with custom redirection rules configured in the .htaccess file under the document root. Check both the website configuration and the .htaccess file to make sure an invalid redirect isn't setup. Let me know if this helps.
I solved it. The problem is from my PrestaShop backend. The other Https was added. check my screenshot. I cahnged it to the one without https and it worked. Thanks once again.