Provider named pipes provider error 40 could not open a connection to SQL Server error 2 [duplicate]

Answer 1

This error has caused been popping up for me since installing .net 4.7 I had to alter my connection string to include TransparentNetworkIPResolution=False;

Server=server;Database=dbname;Uid=user;Pwd=pword;TransparentNetworkIPResolution=False;

Answer 2

Search for services in control panel, there you will find and entry View Local Services in Admin tool section

select it that will show a window with all services in your system, find your service SQLEXPRESS and click on Start. It should start your server instance :)

Answer 3

In my case, first I'm inserting/viewing/deleting data in my local SQL Server. Then at some point in development, the client wants to up the system(Windows Forms) in the server (network) so I've face to this kind of problem, what I check is the likes of this.viewEmployeeTableAdapter i delete that because it is still connected to the local db. I notice that because in my PC. The system is working properly whilst when im transferring it to other PC the

Provider named pipes provider error 40 could not open a connection to SQL Server error

is appearing. So it's because I have a sql connection opening MY SQL Server while the other PC doesnt have.