Asp net via kerberos integrated windows authentication to sql server

ASP.NET is a widely used programming language for developing web applications. It provides a powerful framework for building dynamic and interactive websites. One common requirement in web development is the integration of ASP.NET with SQL for data storage and retrieval. In this article, we will explore how to achieve this integration using Kerberos integrated Windows authentication.

Kerberos is a network authentication protocol that allows secure communication between clients and servers over an insecure network. It provides a mechanism for mutual authentication, ensuring that both the client and server can each other's identities. Integrated Windows authentication, on the other hand, allows users to authenticate using Windows without the need for additional login prompts.

To integrate ASP.NET with SQL Server using Kerberos integrated Windows authentication, we need to follow a few steps. Let's dive into each step in detail.

Step 1: Configure Kerberos Authentication
First, we need to configure Kerberos authentication on the server hosting the ASP.NET application and the SQL Server. This involves setting up a Service Principal Name (SPN) for the SQL Server service account. The SPN is used by Kerberos to identify the service offered by the SQL Server.

To configure Kerberos authentication, open a prompt with administrative privileges and run the following command:

Example 1: Configuring Kerberos Authentication

setspn -A MSSQLSvc/: 

Replace with the fully qualified domain name of the SQL Server and with the port used by the SQL Server. Also, replace with the service account used by the SQL Server.

Step 2: Configure ASP.NET Application
Next, we need to configure the ASP.NET application to use Kerberos integrated Windows authentication. This involves modifying the web.config file of the application.

Open the web.config file and locate the element. Set the mode attribute to “Windows” to enable Windows authentication. Additionally, set the impersonate attribute to “true” to allow the application to run the of the authenticated user.

Example 2: Configuring ASP.NET Application


Step 3: Connect to SQL Server
Finally, we can connect to the SQL Server from the ASP.NET application using integrated Windows authentication. We can use the SqlConnection class provided by the System.Data.SqlClient to establish a connection.

Example 3: Connecting to SQL Server

using System.Data.SqlClient;

string connectionString = "Data Source=,;Initial Catalog=;Integrated Security=SSPI;";
using (SqlConnection connection = new SqlConnection(connectionString))
    // Perform database 

Replace with the fully qualified domain name of the SQL Server, with the port number used by the SQL Server, and with the name of the database you want to connect to.

In the above example, we create a SqlConnection object and pass the connection string as a parameter. The connection string specifies the SQL Server, database, and integrated security settings. The “Integrated Security=SSPI;” setting enables integrated Windows authentication.

In this article, we explored how to integrate ASP.NET with SQL Server using Kerberos integrated Windows authentication. We learned about configuring Kerberos authentication, modifying the ASP.NET application, and connecting to SQL Server using integrated security. By following these steps, you can securely authenticate users and access SQL Server data within your ASP.NET application.

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