HTTPS调用异常“由于意外的数据包格式，握手失败。”

Question

当从windows服务进行REST api调用(使用https方案)时，我得到一个异常，它指出“握手失败是由于意外的数据包格式。”如果将域用户分配为服务登录帐户，则上述异常将会消失。

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此外，在开发阶段(Visual studio 2015，C#)，我没有得到任何异常。

***Code Snippet:***
 ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
 HttpClient Client = new HttpClient();
 var response = await Client.PostAsync("https://auth.brivo.com/oauth/token", httpContent, cancellationToken).ConfigureAwait(false);

***Exception Thrown:***
System.Net.Http.HttpRequestException occurred
  HResult=-2146233088
  Message=An error occurred while sending the request.
  Source=mscorlib
  StackTrace:
       at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
       at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
       at Sisco.FastPass.AccessControl.Brivo.HttpClientHelper.<PostFormDataRequest>d__5`2.MoveNext()
  InnerException: 
       HResult=-2146233079
       Message=The underlying connection was closed: An unexpected error occurred on a send.
       Source=System
       StackTrace:
            at System.Net.HttpWebRequest.EndGetRequestStream(IAsyncResult asyncResult, TransportContext& context)
            at System.Net.Http.HttpClientHandler.GetRequestStreamCallback(IAsyncResult ar)
       InnerException: 
            HResult=-2146232800
            Message=**The handshake failed due to an unexpected packet format.**
            Source=System
            StackTrace:
                 at System.Net.TlsStream.EndWrite(IAsyncResult asyncResult)
                 at System.Net.PooledStream.EndWrite(IAsyncResult asyncResult)
                 at System.Net.ConnectStream.WriteHeadersCallback(IAsyncResult ar)
            InnerException: 

Answer 1

如下所示参考此链接并选中启用ssl协议部分：https://www.limilabs.com/blog/the-handshake-failed-due-to-an-unexpected-packet-format