After security updates, Its stopped root login, user login and website login

Hi guys, After updates, I am not able to log in to the root, users, or website. It stopped logging in everywhere. How to resolve it. Please guide.

When I logged into the root, I saw some updates, Then I updated. Then I logged out.
When I was trying to log in, I am not able to log in now. What to do guys?
Thanks.