I'm running PrestaShop 1.6.1.20 for quite a while now, and suddenly I get notes from customers, who have paid their order and on returning to the site, they receive a "File not found." error. (So it isn't an upgrade issue, and yes I know I should upgrade, soon. It is already planned.) It is when they are redirected to the following URL:
https://<<webshop>>/nl/index.php?controller=order-confirmation
Also I noticed everything beginning with "index.php" is returning this 404-error. For example: when order details from a previous order in the "order history" has to be displayed... (https://<<webshop>>/nl/index.php?controller=order-detail%27) However, the rest of the website (categories, products and the total backoffice) is working fine. (When I strip the language and the controller, with the bare "https://<<webshop>>/index.php", I am redirected to the homepage...)
In the apache error-log I do not see any 404-errors. Also when I enable "show PHP-errors", nothing shows up in the log or website. I also enabled the debug-setting from defines.inc.php, but still no clue...
How do I have to proceed to debug which file is supposed to be missing? Any help is appreciated.
Kind regards,
Daniël