Neterr cert authority invalid in asp net core


ASP.NET is a popular programming language used for building web applications. It provides a framework for developing dynamic websites, web services, and web applications. In this article, we will explore how to solve the issue of “Neterr cert authority invalid” in ASP.NET Core.

Understanding the Issue

The error message “Neterr cert authority invalid” typically occurs when there is an issue with the SSL certificate authority. This error indicates that the SSL certificate used by the is not trusted by the browser. This can happen due to various reasons, such as an expired or self-signed certificate, or a misconfiguration in the server settings.


To solve the “Neterr cert authority invalid” issue in ASP.NET Core, you can follow these steps:

Step 1: SSL Certificate

The first step is to check the SSL certificate used by your website. Ensure that the certificate is valid and issued by a trusted certificate authority. You can use tools like OpenSSL to verify the certificate details.

// Example code to check SSL certificate  OpenSSL
openssl s_client -connect

Step 2: Update Certificate

If the SSL certificate is expired or self-signed, you need to update it with a valid certificate issued by a trusted certificate authority. You can obtain a certificate from a trusted provider like Let's or purchase one from a certificate authority.

Step 3: Server

Once you have a valid SSL certificate, you need to configure your server to use it. In ASP.NET Core, you can configure the server settings in the appsettings.json file or through code. Ensure that the certificate is correctly configured with the appropriate bindings and settings.

// Example code to configure server with SSL certificate in ASP.NET Core
 static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
        .UseKestrel(options =>
            options.Listen(IPAddress.Any, 443, listenOptions =>
                listenOptions.UseHttps("path/to/certificate.pfx", "certificate-");

Step 4: Test the Website

After updating the SSL certificate and configuring the server, you should test the website to ensure that the “Neterr cert authority invalid” issue is resolved. Open the website in a browser and check if the SSL certificate is trusted and the error message is no displayed.


The “Neterr cert authority invalid” issue in ASP.NET Core can be resolved by checking and updating the SSL certificate, configuring the server with the certificate settings, and testing the website. By following these steps, you can ensure that your website's SSL certificate is trusted by browsers and eliminate the error message.

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