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Editorial Team
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Asked: 2026-05-16T16:08:40+00:00

I am trying to create a simple login page in ASP.NET C# but am

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I am trying to create a simple login page in ASP.NET C# but am getting some error.

I googled about the error, and tried all the solutions but to no avail.
What am I doing wrong? The error is:

“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: SQL Network Interfaces, error: 26 – Error Locating Server/Instance Specified)”

I think it’s something to do with my connection string which is as follows:

 <add name="cn"
      connectionString="server=HCL;DataBase=GS;Integrated Security=True" />

“HCL” is another machine connected to my PC through the LAN and this database, “GS”, resides on it. Is the problem with the value I am giving in “Server” attribute of the above code? If not what else may I be doing wrong?

I can tell all solutions I tried. Let me know if that’s required.

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1 Answer

  1. Editorial Team

    I don’t think “Server” is a valid property for a connection string. Try “Data Source” instead. “Integrated Security” should also be set to SSPI:

    <add name="cn" connectionString="Data Source=HCL;Initial Catalog=GS;Integrated Security=SSPI"/>

    UPDATE:
    I just noticed that you have also used “Database”. This should be “Initial Catalog”.

    UPDATE2:
    There is a neat trick for creating connection strings by using .udl files. If you create an empty file called “something.udl” and double click it, Windows will open a nice dialog for defining connections. To create a connection string for a SQL Server, choose “Microsoft OLEDB Provider for SQL Server” on the “Provider” tab and then fill in your server name, login credentials, and database name on the “Connection” tab. Finish by testing the connection and click “OK”.

    After the dialog is closed, you can drag the .udl file into Notepad or Visual Studio and you will see that the .udl file actually contains a connection string ready for you to use (note that if you wish to use the connection string with SqlConnection in .NET you must remove the “Provider=SQLOLEDB.1” part of the string).

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