.net core 3.1 服务器端获取用户信息经常出现

System.Net.Http.HttpRequestException: The SSL connection could not be established, see inner exception.

 ---> System.IO.IOException: Authentication failed because the remote party has closed the transport stream.

   at System.Net.Security.SslStream.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)

   at System.Net.Security.SslStream.PartialFrameCallback(AsyncProtocolRequest asyncRequest)

--- End of stack trace from previous location where exception was thrown ---

   at System.Net.Security.SslStream.EndProcessAuthentication(IAsyncResult result)

   at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)

--- End of stack trace from previous location where exception was thrown ---

   at System.Net.Http.ConnectHelper.EstablishSslConnectionAsyncCore(Stream stream, SslClientAuthenticationOptions sslOptions, CancellationToken cancellationToken)

   --- End of inner exception stack trace ---

   at System.Net.Http.ConnectHelper.EstablishSslConnectionAsyncCore(Stream stream, SslClientAuthenticationOptions sslOptions, CancellationToken cancellationToken)

   at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean allowHttp2, CancellationToken cancellationToken)

   at System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)

   at System.Net.Http.HttpConnectionPool.GetHttpConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)

   at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)

   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)

   at System.Net.Http.DiagnosticsHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)

   at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)

不是必然，是经常出现 ，请问是什么问题啊

请求代码

           var hander = new HttpClientHandler();

            hander.ServerCertificateCustomValidationCallback = (message, certificate2, arg3, arg4) => true;

          HttpClient webClient = new HttpClient(hander);

            var jsonString =

              await (await webClient.GetAsync(

              $"https://api.weixin.qq.com/sns/jscode2session?appid={SystemSetting.WeClientMiniAppID}&secret={SystemSetting.WeClientMiniAppSecret}&js_code={request.WeCode}&grant_type=authorization_code"

               )).Content.ReadAsStringAsync();