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

Answer 1

I have provided steps to fix your issue Provider named pipes provider error 40 could not open a connection to SQL Server error as below:

1. Confirm for working fine SQL Server Services services.
2. Confirm for working fine SQL Server (MSSQLSERVER).
3. Confirm for working fine SQL Server Browser.
4. Delete all your previous Aliases and now create new aliases as per your requirements.
5. Now assign your SQL Server Default Port 1433
6. Now click on Client Protocols in instance, click on TCP/IP in right pane, now click on mouse right click, open Property, here you can check for your default port of SQL 1433
7. Run your SQL Server Management Studio, then right click, click on property option and then click on Connections on tab, now check for Allow remote Connections to this server.
8. Confirm for Ping IP Host or not
9. Check for your Firewall setting not to blocking your SQL Server port

Answer 2

In Sql Server Configuration Manager program, start SQL SERVER, enable the TCP/IP connection. After, allow the port in the firewall to be sure that's ok.

Answer 3

In my case, this was the solution.

I found out that I could connect using localhost**instancename**

So I uninstalled Database Engine component only.

Then I ran SQL Server installer and this time chose default instance option whereas before I had named the instance the same as my machine.

Now I can connect using localhost(which is setup in several application config files so I needed to still connect like this).

Answer 4

Well I have an easy solution for your question. Follow the steps:

1. Go to SQL Server Configuration manager
2. SQL Server Network Configuration:
3. Protocol for MSSQLSERVER
4. In the right pane split page you will have to disable VIA as follows
   1. Shared Memory - Enable
   2. Named Pipes - Enable
   3. TCP/IP - Enable
   4. VIA - Disable

Answer 5

It's a generic error so it can be a lot of things. I got this error once and when I added port number (1433) to my connection string everything started to work again.

<connectionStrings>
    <add name="ConnectionString" connectionString="Data Source=Server,1433;Initial Catalog=Test;Integrated Security=SSPI;" providerName="System.Data.SqlClient"/>
</connectionStrings>

Answer 6

Best idea is uninstall SQL and again Install SQL, Clear all temp files first and restart after that install. give a proper name to instance at a time of install.