When setting up OpenCart, the database gives an error, what could be the problem?

Question

opencart

Warning: mysqli::__construct(): (HY000/2002): ????????? ?? ???????????, ?.?. ?????? ??????? ?????? ?????? ?? ?????????. in C:\OpenServer\domains\opencart\system\library\db\mysqli.php on line \db\mysqli.php on line 10Warning: DB\MySQLi::__construct(): Couldn't fetch mysqli in C:\OpenServer\domains\opencart\system\library\db\mysqli.php on line 10Notice: Undefined variable: mysql in C:\OpenServer\domains\opencart\install\controller\install\step_3.php on line 280Notice: Trying to get property of non-object in C:\OpenServer\domains\opencart\install\controller\install\step_3. php on line 280

Answer 1

And what about encoding? Why is there no error text, but question marks instead?
Something was discussed on opencartforum similar