对 SSPI 的调用失败，请参阅内部异常 - 无法联系本地安全机构

我有一个 WPF 应用程序，它使用 SSLStream 连接到服务器并发送/接收一些消息。我的代码很大程度上基于此示例（SslTcpClient）：https://msdn.microsoft.com/en-us/library/system.net.security.sslstream(v=vs.110).aspx https://msdn.microsoft.com/en-us/library/system.net.security.sslstream(v=vs.110).aspx.

这几个月来效果很好。但是，在获取此 Windows 更新后（Windows 10 版本 1511 和 Windows Server 2016 技术预览 4 的累积更新：2016 年 6 月 14 日 -https://support.microsoft.com/en-us/kb/3163018 https://support.microsoft.com/en-us/kb/3163018）。我的应用程序开始报告此异常：

System.Security.Authentication.AuthenticationException: A call to SSPI failed, see inner exception. ---> System.ComponentModel.Win32Exception: The Local Security Authority cannot be contacted
   --- End of inner exception stack trace ---
at System.Net.Security.SslState.StartSendAuthResetSignal(ProtocolToken message, AsyncProtocolRequest asyncRequest, Exception exception)
at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer, Int32 count, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
at System.Net.Security.SslStream.AuthenticateAsClient(String targetHost, X509CertificateCollection clientCertificates, SslProtocols enabledSslProtocols, Boolean checkCertificateRevocation)
at MyAPP.Core.Services.Network.Impl.SslTcpClient.ClientSideHandshake()
at MyAPP.Core.Services.Network.Impl.SslTcpClient.Connect()
at MyAPP.Core.Services.Impl.MessageService.SendMessage(String message)

我能做些什么 ？

这意味着另一方正在使用另一个版本的 TLS，而您正在使用旧版本。
在建立连接之前将安全属性设置为 TLS12。 这是一个众所周知的问题，因为许多提供商开始使用 TLS12（例如 paypal、amazon 等）。

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;