Calling Untrusted SSL HTTPS request using HttpClient give “Message=The remote certificate is invalid according to the validation procedure”

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Scenario:

+You want to deploy web application server (for example ASP.NET Web API) which require SSL certificate and HTTPS

+You want to make a call to that server using HttpClient

Problem:

+You may see the following errors message when make a call to https required url using HttpClient
HResult=-2146233079
Message=The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.

HResult=-2146233087
Message=The remote certificate is invalid according to the validation procedure.

HResult=-2146233088
Message=An error occurred while sending the request.

Solution:

Using this lines of code to accept all server certificates from client. This line of code is using for testing purpose only with you are using self-signed or untrusted certificates

//Accept all server certificate
ServicePointManager.ServerCertificateValidationCallback =
    delegate (object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
                {
                    return true;
                };

For example you want to make a https POST to Web API method in this post Hello ASP.NET Web API

static async Task PostSampleAsync()
        {
            //Accept all server certificate
            ServicePointManager.ServerCertificateValidationCallback =
                delegate (object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
                {
                    return true;
                };
            client.BaseAddress = new Uri("https://10.1.16.193/WebAPISample/");
            client.DefaultRequestHeaders.Accept.Clear();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

            HttpResponseMessage response = await client.PostAsJsonAsync("api/values", "hello!");
            response.EnsureSuccessStatusCode();
            var result = response.Content.ReadAsAsync<string>().Result;
            Console.WriteLine(result);
        }

Happy coding!

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