Regarding connecting SharePoint Site with SSL and Cert by using CSOM

Hi there,

My development environment is 1* SharePoint Server and 1* Laptop (the laptop doesn't join the SharePoint Domain). there is a SharePoint Site with SSL and Cert inside. Currently I try to connect to SharePoint Site by CSOM. My code like this:

I ran the source code in Server Side, everything work properly. Inversely, the code was ran in the client side, I got the error message like this "The remote server returned an error: (401) Unauthorized."

Is there any ways to sort it out?? Thanks

static void Main(string[] args)
        {
            using (ClientContext clientContext = new ClientContext("https://xxx.dev.xxxxx.xxxxx"))
            {
                ServicePointManager.ServerCertificateValidationCallback = delegate (object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
                {
                    bool validationResult = true;
                    return validationResult;
                };

                ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
                ServicePointManager.ServerCertificateValidationCallback += new RemoteCertificateValidationCallback(customXertificateValidation);
                clientContext.ExecutingWebRequest += new EventHandler<WebRequestEventArgs>(context_ExecutingWebRequest);

                clientContext.Credentials = new NetworkCredential("xxx", "xxx", "xxx");

                // The SharePoint web at the URL.
                Web web = clientContext.Web;

                // We want to retrieve the web's properties.
                clientContext.Load(web);

                // Execute the query to the server.
                clientContext.ExecuteQuery();

                Console.WriteLine(web.Title);
            }
        }

        private static void context_ExecutingWebRequest(object sender, WebRequestEventArgs e)
        {
            //HttpWebRequest webReq = e.WebRequestExecutor.WebRequest;
            //webReq.Proxy = new WebProxy("http://[ProxyAddress]"); //Specify a proxy address if you need to

            //X509Certificate cert = X509Certificate.CreateFromCertFile(@"C:\oos.test.cmmp.hksarg.cer");
            //webReq.ClientCertificates.Add(cert);

            HttpWebRequest webReq = e.WebRequestExecutor.WebRequest;

            X509Store userCaStore = new X509Store(StoreName.My, StoreLocation.LocalMachine);

            string thumbprint = "09d7aeec71cd41d2190eac71906bb85faf285762";
            thumbprint = Regex.Replace(thumbprint, @"[^\da-fA-F]", string.Empty).ToUpper();

            try
            {
                userCaStore.Open(OpenFlags.ReadOnly);

                X509Certificate2Collection certificatesInStore = userCaStore.Certificates;
                X509Certificate2Collection findResult = certificatesInStore.Find(X509FindType.FindByThumbprint, thumbprint, false);
                X509Certificate2 clientCertificate = null;

                if (findResult.Count == 1)
                {
                    clientCertificate = findResult[0];
                }
                else
                {
                    throw new Exception("Unable to locate the correct client certificate.");
                }

                webReq.ClientCertificates.Add(clientCertificate);
            }
            catch
            {
                throw;
            }
            finally
            {
                userCaStore.Close();
            }
        }

        private static bool customXertificateValidation(object sender, X509Certificate cert, X509Chain chain, System.Net.Security.SslPolicyErrors error)
        {
            return true;
        }

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