Ssl certificate

Do you want to say that it will last itself when the period completely expires?

I don't know all this: You should try and find out if Certbot is installed (try running certbot certificates) or if some other ACME client is there.

As I said earlier, I am not a server admin.

It's not a matter of certbot, but of request blocking

Colleagues from the Russian Federation ask what kind of certificate they can give you