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SQL Server Error 4014 typically indicates a fatal error in a network or I/O operation, often caused by hardware issues, driver conflicts, or SQL Server bugs. It can also occur due to corruption in database files like MDF or NDF. This error interrupts server connectivity or query execution, and may appear in the SQL Server Error Log or Event Viewer. Update all hardware drivers and SQL Server to the latest version. Check system logs for disk or memory failures. Run DBCC CHECKDB to detect corruption. If corruption is found, use a professional tool like the MS SQL Recovery Tool to repair MDF/NDF files and restore the database components safely without data loss.