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Http client an existing connection was forcibly closed by the remote host

What am I doing wrong here?

        var formContent = new FormUrlEncodedContent(new[]
            {
            new KeyValuePair<string, string>("mobile_numbers", "5555555555"), 
            new KeyValuePair<string, string>("message", "Whoo hahahahah") 
            });           

        HttpClient client = new HttpClient();
        client.BaseAddress = new Uri("https://api.iwin.co.za");
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", "134134134");
        HttpResponseMessage response = client.PostAsync("iwin/api/v1/messages", formContent).Result;

When I run the code above, I get this error: The existing connection was forcibly closed by the remote host I went through the code several times and everything looked good, some articles point out the error I get is a server problem, but when I try to use R- client, it works fine

Http request

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2 answers


This can be caused if the client and server cannot agree on the version of the TLS protocol in use.

I think in this case .Net 4.5.2 and earlier defaults to v1, with v1.2 being deactivated if included in the framework. (In .Net 4.6. *, V1.2 by default.)

To enable v1.2 in 4.5.2 you can use:



System.Net.ServicePointManager.SecurityProtocol |= SecurityProtocolType.Tls12;

(I believe this allows it for the entire application domain?)

Solved the problem anyway (against another website).

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please change the code according to below

1) the problem is with https. you need to add the correct certificate for this.

Dictionary<string, string> formContent= new Dictionary<string, string>();
mapObject.Add("mobile_numbers","5555555555");
mapObject.Add("message","Whoo hahahahah")

var jsonString = JsonConvert.SerializeObject(formContent);

WebRequestHandler handler = new WebRequestHandler();
X509Certificate2 certificate = GetMyX509Certificate();
handler.ClientCertificates.Add(certificate);

HttpClient client = new HttpClient(handler);
client.BaseAddress = new Uri("https://api.iwin.co.za");
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
client.DefaultRequestHeaders.Add("Authorization", "Bearer 134134134");

HttpResponseMessage response = client.PostAsync("/iwin/api/v1/messages", getHttpContent(jsonString)).Result;


another function to convert json to HttpContent

  private static HttpContent getHttpContent(string jsonString)
        {
            var content = new StringContent(jsonString, Encoding.UTF8, "application/json");
            return content;
        }

or you can work around the Cerificate error When developing or working with self-signed certificates, you can ignore untrusted certificate errors with the following: ServicePointManager.ServerCertificateValidationCallback + = (sender, cert, chain, sslPolicyErrors) => true;

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