How can I make iis and asp net aware of ssl offloading so that it uses correct p

Introduction

SSL offloading is a technique used to improve the performance and scalability of web applications by offloading the SSL encryption and process to a dedicated device or load balancer. However, when using SSL offloading with IIS and ASP.NET, it is important to ensure that the protocol is used to maintain the security of the application. In this article, we will explore how to make IIS and ASP.NET aware of SSL offloading and configure them to use the correct protocol.

Understanding SSL Offloading

SSL offloading involves terminating the SSL at the load balancer or hardware device, decrypting the traffic, and then forwarding it to the web server in plain HTTP. This allows the web server to focus on processing the application without the overhead of SSL encryption and decryption. However, this also means that the web server needs to be aware that SSL termination has occurred and that it should treat the incoming traffic as unencrypted.

Configuring IIS for SSL Offloading

To make IIS aware of SSL offloading, you need to configure the web server to use the correct protocol for incoming requests. This can be done by modifying the web. file of your ASP.NET application. Open the web.config file and locate the section. Within this section, add the following code:



  
    
      
      
        
      
      
    
  

This code adds a rewrite rule that checks the of the HTTP_X_FORWARDED_PROTO server variable, is set by the load balancer or hardware device. If the value is “https”, it means that SSL termination has occurred, and the rule sets the type to “None”, indicating that the request should be treated as unencrypted.

Configuring ASP.NET for SSL Offloading

In addition to configuring IIS, you also need to make ASP.NET aware of SSL offloading. This can be done by modifying the Global.asax.cs file of your ASP.NET application. Open the file and locate the Application_BeginRequest method. Add the following code:


protected void Application_BeginRequest(object sender, EventArgs e)
{
    if (Request.Headers["X-Forwarded-Proto"] == "https")
    {
        Request.ServerVariables["HTTPS"] = "on";
    }
}

This code checks the value of the X-Forwarded-Proto , which is also set by the load balancer or hardware device. If the value is “https”, it means that SSL termination has occurred, and the code sets the HTTPS server variable to “on”, indicating that the request should be treated as unencrypted.

Conclusion

By configuring IIS and ASP.NET to be aware of SSL offloading, you can ensure that your web application uses the correct protocol even when SSL termination occurs at a load balancer or hardware device. This helps maintain the security and integrity of your application while improving its performance and scalability. Remember to always test your configuration thoroughly to ensure that it works as expected.

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