System.IO.IOException: Unable to read data from the transport connection: Connection reset by peer

Question

Hi,

I don't understand why some times I got the below exception?

System.AggregateException: One or more errors occurred. (The SSL connection could not be established, see inner exception.) ---> System.Net.Http.HttpRequestException: The SSL connection could not be established, see inner exception. ---> System.IO.IOException: Unable to read data from the transport connection: Connection reset by peer

and I didn't find anything in my httpclient GET below:

                double totalUsage = 0;  
                int pageNo = 0;  
                  
                while (true)  
                {  
                    pageNo++;  
  
                    HttpClientHandler clientHandler = new HttpClientHandler();  
                    clientHandler.SslProtocols = System.Security.Authentication.SslProtocols.Tls13;  
                    clientHandler.ServerCertificateCustomValidationCallback += (sender, cert, chain, sslPolicyErrors) => {  
                        return true;  
                    };  
  
                    using (var client = new HttpClient(clientHandler))  
                    {  
                        var url = new Uri($"https://xx.xxxx.com/api/{iccid}/data/?startDate_from={period}&type=data&per_page=500&page=" + pageNo);  
                
                        client.DefaultRequestHeaders.Accept.Clear();  
                        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));  
                        client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Token", token);  
  
                        var response = await client.GetAsync(url);  
                        HttpStatusCode statusCode = response.StatusCode;  
  
                        if (statusCode == HttpStatusCode.OK)  
                        {  
                            response.EnsureSuccessStatusCode();  
                            string res = await response.Content.ReadAsStringAsync();  
                            if (response.IsSuccessStatusCode)  
                            {  
                                try  
                                {  
                                    JArray ja = JArray.Parse(res);  
  
                                    if (ja.HasValues)  
                                    {  
                                        if (string.IsNullOrEmpty(network))  
                                        {  
                                            network = (string)ja[0]["network"];  
                                        }  
  
                                        totalUsage = totalUsage + ja.Select(q => q["duration"].Value<double>()).Sum();  
                                    }  
                                }  
                                catch (Exception e) { await Helper.SaveLogAsync("Truphone.SIMs: " + e.ToString(), Errs.ErrType.Err); }  
                                finally { }  
                            }  
                        }  
                        else  
                            break;  
                    }  
                }  
  
                Task.WaitAll();  
  
                if (totalUsage > 0)  
                {  
                    Models.Usage.Add_Update(iccid, period, totalUsage, network);  
                }  

Answer 1

You are not following the official HttpClient documentation. Register the HttpClient as a service and use dependency injection. You should have one HttpClient for each services and not dispose the HttpClient on each use. This can cause the connection issues described above.

Make HTTP requests using IHttpClientFactory in ASP.NET Core