The application failed to connect to the database. This may be due to:
SQLSTATE[HY000] [2002] Connection refused
Host: db-server.internal.company.com:3306
Database: production_db
User: app_user
Possible causes:
- Database server is down or unreachable
- Incorrect connection credentials
- Network connectivity issues
- Firewall blocking the connection
- Maximum connection limit exceeded
Database connection: Failed