For a few days, the login and register in our shop do not work. A login will be directly redirected to the login page instead of logging in the user.
- Form_key is set.
- The action of the login form is HTTPS.
- The login page is
- I have checked the config in :
System > Configuration > Customer > Customer configuration > Login options
- The value for "re-direct to account dashboard" was YES. A switch to "NO" had no effect.
What could be a possible reason? This is our shop: https://www.serverandstorage-shop.de