Minecraft signing is not working, why?

For some days I'm trying on the minecraft. Log in on the net page, but after I enter my credentials and press log on, nothing happens. I would like to know if you also have the same problem and if someone might have a solution.

Have you ever been to old account websites?

What do you mean by that?

That you get a free premium account? I mean such kind of websites

I've been investigating, apparently the problem occurs with several people

Can you please me? Times send a screenshot?