ลองทำแบบที่คุณ FONFIRE บอกแต่มันมี pop up ขึ้นมาแบบนี้ง่า
ADDITIONAL INFORMATION:
Login timeout expired
A network-related or instance-specific error has occurred while establishing a connection to SQL Server. Server is not found or not accessible. Check if instance name is correct and if SQL Server is configured to allow remote connections. For more information see SQL Server Books Online.
SQL Server Network Interfaces: Server doesn't support requested protocol [xFFFFFFFF]. (Microsoft SQL Server Native Client 10.0)