How I solve this error. SQL error 40

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I am developing a program in VS.2010 combining visual basic project with a DLL from c #.  the problem is that my PC works fine but when I run it on another pc I get the following error.

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)




I gave change the server name in the connection string for the name of the machine on which I want to run it.

however always happens the same error. verique and sql and all services are running well

Posted 2-Feb-14 4:26am

idoug12

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2 solutions

Solution 1

Hi,

Have a look here:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible.[^]
Another reason for getting the error "A network-related or instance-specific error occurred while establishing a connection to SQL Server…" in MS SQL Server 2008[^]
http://blog.sqlauthority.com/2009/05/21/sql-server-fix-error-provider-named-pipes-provider-error-40-could-not-open-a-connection-to-sql-server-microsoft-sql-server-error/[^]
http://stackoverflow.com/questions/5435090/sql-server-was-not-found-or-was-not-accessible[^]
http://stackoverflow.com/questions/18060667/connect-to-server-a-network-related-or-instance-specific-error[^]

Posted 2-Feb-14 4:40am

Thomas Daniels

Updated 2-Feb-14 4:43am

v2

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idoug12 13-Feb-14 8:11am

I have followed each of their tips and have checked all, but it seems that the project for some reason keeps bringing me the name of the server where the application develops. it could be? help me

Thomas Daniels 13-Feb-14 11:43am

What do you mean exactly?

idoug12 13-Feb-14 11:45am

I developing a application in visual studio 2010 with a base in sql server 2008 r2. on PC where I am developing functioning properly but I tried it on another machine and I did not connect to the database.

already changed the connection string
Data Source = (local); Initial Catalog = "database"; Integrated Security = True // and still can not connect. help me

Thomas Daniels 13-Feb-14 11:49am

Do you also have SQL Server installed on the other machine?

idoug12 13-Feb-14 11:55am

yes.

Thomas Daniels 13-Feb-14 11:57am

Strange. Doing the things that are said in the blogs that I linked to should work. I have to go now, but I'll try to find another solution later.

idoug12 13-Feb-14 12:01pm

thank you bro

Thomas Daniels 14-Feb-14 11:44am

You can also have a look at this blog[^] or this blog[^]. Hope this helps.

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The14thNoah · Accepted Answer · 2014-02-02T13:10:00

Solution 2

Check on connection string and/or User role un other machine's database where ur program is running. . .

error: 40 - Could not open a connection to SQL Server is something to do with the connection of program's dedicated server
hope it will help. . .

Posted 2-Feb-14 13:10pm

The14thNoah

Comments

idoug12 13-Feb-14 8:11am

I have followed each of their tips and have checked all, but it seems that the project for some reason keeps bringing me the name of the server where the application develops. it could be? help me