Ошибка подключения к базе данных 2 не удалось подключиться к mysql

Today I have got a new project that is in Joomla.
I have website code downloaded on my computer.
Website administration panel is cpanel.

I have never done anything with Joomla site before.

When I open website on my local machine (http://localhost/ppp/public_html/index.php) it says Database connection error (2): Could not connect to MySQL.
However, I have changed configuration.php file (it was my guess that I need to change it):

//Before my changes it was the following:
public $host = 'localhost';
public $user = 'reiuser_reiuser';
public $password = 'password';
public $db = 'reiuser_reiuser';

//After my changes:
public $host = '174.121.134.94'; //IP was displayed in cpanel
public $user = 'reiuser_reiuser';
public $password = 'password';
public $db = 'reiuser_reiuser';

I have read info about this error and most says to check connection data.
However, I can successfully connect with HeidiSql using those connection data (user/password/db were changed).

Maybe here is not enough information, but maybe Joomla developers can suggest what to do?
Which Joomla file is dooing connection? Maybe I can do some echos to understand the cause of error?
Website is using CPanel.

Thank you.

Today I have got a new project that is in Joomla.
I have website code downloaded on my computer.
Website administration panel is cpanel.

I have never done anything with Joomla site before.

When I open website on my local machine (http://localhost/ppp/public_html/index.php) it says Database connection error (2): Could not connect to MySQL.
However, I have changed configuration.php file (it was my guess that I need to change it):

//Before my changes it was the following:
public $host = 'localhost';
public $user = 'reiuser_reiuser';
public $password = 'password';
public $db = 'reiuser_reiuser';

//After my changes:
public $host = '174.121.134.94'; //IP was displayed in cpanel
public $user = 'reiuser_reiuser';
public $password = 'password';
public $db = 'reiuser_reiuser';

I have read info about this error and most says to check connection data.
However, I can successfully connect with HeidiSql using those connection data (user/password/db were changed).

Maybe here is not enough information, but maybe Joomla developers can suggest what to do?
Which Joomla file is dooing connection? Maybe I can do some echos to understand the cause of error?
Website is using CPanel.

Thank you.

На сайте ошибка базы данных

На сайте может отображаться одна из следующих ошибок подключения к базе данных:

• «Error Establishing a Database Connection»,
• «Database connection error (2): Could not connect to MySQL»,
• «DB error»,
• «Could not connect to MySQL»,
• «Невозможно подключиться к базе данных».

Ошибку могут вызвать две причины: сервер баз данных недоступен или неверно прописаны реквизиты подключения к базе данных. В первую очередь убедитесь, что сервер баз данных доступен. Если ошибка всё равно появляется, решите проблему по инструкции ниже.

Что делать, если неверно прописаны реквизиты подключения к базе данных

Ошибка может возникать, если в конфигурационном файле сайта неправильно указаны реквизиты базы данных: сервер, имя базы данных, имя пользователя и пароль.
Чтобы проверить реквизиты:

Готово, теперь ошибка должна быть устранена.