After moving to a new server with plesk, I get a 404 not found when i press add to cart. I am not sure why. I truncated the core_url_rewrite table, deleted everything in var/cache and var/session before moving the site.
An example of the 404 url:
/checkout/cart/add/uenc/aHR0cHM6Ly9lbGVrdHJvbmlrZGVsZS5kay8,/product/1193/form_key/0X2MdMHKzLuVombB/
Magento 1.9.3