On our servers, we use Firewall software to monitor server security.
If you find that you can visit any site other than yours (as well as your webmail, your cPanel), then perhaps your IP is blocked ,
This usually happens after you have tried to log in to your cPanel or webmail several times and failed to do so.

How to check and unblock your IP:

Go to your billing account at https://hostetski.ru/panel,
Go to the menu Support -> Unlock IP
https://hostetski.ru/panel/billing.php

And you will be able to check and unlock your IP address.