Suddenly unable to log in to admin or log in as a customer

[medpub]

Suddenly (about 18th Sept 2020) I can't log into my Admin and None of my customers can log in. I also cannot create a new customer account and cannot ask for a password reset.

ADMIN: When I fill in Username and Password (the complex log in given by AbanteCart - I never changed it) it goes to log in but instead returns to the Log in with no input info and no message of error.

When I log in as a customer I see:  Unknown error encountered. Please try again!

Was there a recent  upgrade that ruined the site?

[maxter]

The question is to you. Did you or any one on your team do any upgrade or changes? What is a version of your AbanteCart?

Based on my experience, there is something changed on your configuraton or hosting side.

There must be something on the AbanteCart or webserver log. Check and share the errors right after login attemnts.