TYPO3 8.7.1 backend Login not working

Question

I have a plain naked TYPO3 8 lts installation.

But I cant login with the backend user.

Install Tool works fine When I create a new BE user in install tool it does not work as well ...

any ideas?

Answer 1

Check in Localconfiguration the [BE][loginSecurityLevel] and change it to normal if it is rsa

Answer 2

For me the solution was deleting the cookies from the browser, then login form works good.