Why does it give a "Connection refused" error?

Question

Yii

Uploaded the site to the host. DB too. gives such an error

Database Exception – yii\db\Exception
SQLSTATE[HY000] [2002] Connection refused
↵
Caused by: PDOException
SQLSTATE[HY000] [2002] Connection refused

Connections to a DB are registered correctly, checked up 100 times.

Answer 1

Settings must be stored in common/config/main-local.phpfor Advancedtemplate and in config/main-local.phpfor Basictemplate.
If you are connecting to a remote host, then you need to allow remote connections in the settings and open the port in the firewall.
Write how you checked the connection.