SSL connection issue while logging into elastic search server

We are trying post the logs in Elasticsearch, but getting the below error from .net core. please guide me how to solve this error.

using (var handler = new HttpClientHandler())

                    handler.SslProtocols = SslProtocols.Tls12 | SslProtocols.Tls11 | SslProtocols.Tls;

                    X509Certificate2 certificate1 = new X509Certificate2(@"path/certifi.cer");


                    using (var client = new HttpClient(handler))
                        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

                        jsonstr = JsonConvert.SerializeObject(cur);

                        var content = new StringContent(jsonstr, Encoding.UTF8, "application/json");

                        var response = await client.PostAsync(LogServer, content);

                        res = await response.Content.ReadAsStringAsync();
                        if (res != "OK")
                            throw new Exception("Send to log server failed: res:" + res);

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