Trouble trusting local https certificate in asp net core


When developing an ASP.NET Core application, you may encounter a situation where you need to trust a local HTTPS certificate. This can be necessary for various reasons, such as testing or purposes. However, trusting a local HTTPS certificate in ASP.NET Core can be a bit tricky. In this article, we will explore different approaches to solve this problem.

Approach 1: Trusting the Certificate Manually

One way to solve the of trusting a local HTTPS certificate in ASP.NET Core is to manually trust the certificate on your machine. Here are the steps to do this:

// Step 1: Get the certificate thumbprint
var certificateThumbprint = "your_certificate_thumbprint";

// Step 2: Open the certificate store
var store = new X509Store(StoreName.Root, StoreLocation.CurrentUser);

// Step 3: Find the certificate by thumbprint
var certificates = store.Certificates.Find(X509FindType.FindByThumbprint, certificateThumbprint, false);

// Step 4: Add the certificate to the trusted root store

// Step 5: Close the certificate store

By following these steps, you can manually trust the local HTTPS certificate in your ASP.NET Core application. However, this approach manual intervention and may not be suitable for all scenarios.

Approach 2: Using the HttpClientHandler

Another approach to solve the problem of trusting a local HTTPS certificate in ASP.NET Core is to use the HttpClientHandler . This class allows you to customize the behavior of the HttpClient when making HTTP . Here's an :

// Step 1:  an instance of HttpClientHandler
var handler = new HttpClientHandler();

// Step 2: Set the ServerCertificateCustomValidationCallback property
handler.ServerCertificateCustomValidationCallback = (sender, certificate, chain, sslPolicyErrors) =>
    // Step 3:  if the certificate is valid
    if (sslPolicyErrors == SslPolicyErrors.None)
        return true; // Trust the certificate

    // Step 4: Handle  certificates
    // You can choose to trust the certificate or not based on your requirements
    return false;

// Step 5: Create an instance of HttpClient with the custom handler
var client = new HttpClient(handler);

By using the HttpClientHandler class and customizing the ServerCertificateCustomValidationCallback property, you can trust a local HTTPS certificate in your ASP.NET Core application. This approach provides more flexibility and control over the certificate validation process.


Trusting a local HTTPS certificate in ASP.NET Core can be a challenging task. However, by following the approaches mentioned in this article, you can overcome this issue. you choose to trust the certificate manually or use the HttpClientHandler class, it's important to ensure the security and integrity of your application's communication.

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