error SQLSTATE[HY000] [2002] Connection refused pada saat di hosting

error nya muncul ketika mencoba login pada saat project sudah diupload di hosting, ketika di localhost baik2 saja tidak muncul error seperti itu, mohon bantuan nya gan.

berikut code pada .env

APP_NAME=Laravel
APP_ENV=local
APP_KEY=base64:irIxCYLbeA8ogo9n/AU0bTjkxpi8djk7kbRVxZfyKUc=
APP_DEBUG=true
APP_LOG_LEVEL=debug
APP_URL=http://localhost

DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=homestead
DB_USERNAME=homestead
DB_PASSWORD=secret

BROADCAST_DRIVER=log
CACHE_DRIVER=file
SESSION_DRIVER=file
QUEUE_DRIVER=sync

REDIS_HOST=127.0.0.1
REDIS_PASSWORD=null
REDIS_PORT=6379

MAIL_DRIVER=smtp
MAIL_HOST=smtp.mailtrap.io
MAIL_PORT=2525
MAIL_USERNAME=null
MAIL_PASSWORD=null
MAIL_ENCRYPTION=null

PUSHER_APP_ID=
PUSHER_APP_KEY=
PUSHER_APP_SECRET=

dan ini code pada database.php

'mysql' => [
            'driver' => 'mysql',
            'host' => env('DB_HOST', 'localhost'),
            'port' => env('DB_PORT', '3306'),
            'database' => env('DB_DATABASE', 'inidatabase'),
            'username' => env('DB_USERNAME', 'user21'),
            'password' => env('DB_PASSWORD', 'user123'),
            'unix_socket' => env('DB_SOCKET', ''),
            'charset' => 'utf8mb4',
            'collation' => 'utf8mb4_unicode_ci',
            'prefix' => '',
            'strict' => true,
            'engine' => null,
        ],

Terima kasih.