Msg 2, Level 20, State 0, Line 0 A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 – Could not open a connection to SQL Server)
Solution: Go to SQL Server Configuration Manager – Services and start alla services with the domain account, not local service startup. This will work.