Https with prestashop

[ylemee]

Hello,
 
I have a site under prestashop with a main domain name and a site that is under synfony him on a subdomain , I wanted to pass these sites https , so I bought a wildcard SSL certificate to secure my sub domains.
 
I made the establishment of SSL Certificates and redirection on port 443 in the VirtualHost of my site, then I selected the " Enable SSL" in the preferences of PrestaShop .
 
My site went well in prestashop https but when I try to access a product for example I get an error: Redirect Loop.
 
 
Do you know whence can this error because now my site is secure but some pages are inaccessible ?
 
thank you