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Verify your Authentication whether it's Windows or SQL Server.I am getting few queries routinely regarding authentication and host name resulting issue into SQL error No 25 & 27 to resolve these issues attempt below points and I posted this error SQL Server Error 25 And 87 with more detail in my earlier article. Step 2: Click on “ Start Window” and expand “ Microsoft SQL Server 2008 R2” and click on “SQL Server Configuration Manager”.Īuthentication And Host Name Setting (SQL Server Error 25 And 27) Step 1: First Step check your SQL services are running fine. NET Framework Version:9 ASP.NET Version:9.1016” (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) Verify that the instance name is correct and that SQL Server is configured to allow remote connections. The server was not found or was not accessible. Please review the stack trace for more information about the error and where it originated in the code.Įxception Details: : A network-related or instance-specific error occurred while establishing a connection to SQL Server. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)ĭescription: An unhandled exception occurred during the execution of the current web request. “ A network-related or instance-specific error occurred while establishing a connection to SQL Server. This error comes out in many ways so that you need to check out all steps provided in this article until you succeed your issue. To succeed this issue, I would recommend to experience gave all strides one by one until your issue get resolve. I'm providing you all necessary steps to resolve issue error: 40 - Could not open a connection to SQL Server. I ran into error provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server on server. One day, I was attempting to connect with MS SQL Server but it didn't succeeded not even after making attempt once more and once more.