When I go to a server, I get the following error: Authentication is currently disabled for maintenance.

I have tried:
-Uninstall minecraft completely and install it again.
-Log out and log in again.
-Switch from WIFI to LAN cable.
-Deactivate the firewall.

Pls, if someone could help me I would really appreciate it,
I bought the game no more than 3 months ago now.
Also it happens on any version.
(If there is an error, sorry, I used Translator).

Thanks.