Question

我将一些数据发布到服务器但应用程序正在抛出异常。这是代码。

        ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3

        Dim bytes As Byte() = Encoding.UTF8.GetBytes(xml)
        Dim request As HttpWebRequest = DirectCast(WebRequest.Create(url), HttpWebRequest)
        request.Method = "POST"
        request.ContentLength = bytes.Length
        request.ContentType = "text/xml"
        Using requestStream As Stream = request.GetRequestStream()
            requestStream.Write(bytes, 0, bytes.Length)
        End Using

这是异常堆栈跟踪。

System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a send. ---> System.IO.IOException: Received an unexpected EOF or 0 bytes from the transport stream.
   at System.Net.FixedSizeReader.ReadPacket(Byte[] buffer, Int32 offset, Int32 count)
   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.TlsStream.CallProcessAuthentication(Object state)
   at System.Threading.ExecutionContext.runTryCode(Object userData)
   at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Net.TlsStream.ProcessAuthentication(LazyAsyncResult result)
   at System.Net.TlsStream.Write(Byte[] buffer, Int32 offset, Int32 size)
   at System.Net.PooledStream.Write(Byte[] buffer, Int32 offset, Int32 size)
   at System.Net.ConnectStream.WriteHeaders(Boolean async)
   --- End of inner exception stack trace ---
   at System.Net.HttpWebRequest.GetRequestStream(TransportContext& context)
   at System.Net.HttpWebRequest.GetRequestStream()

我根据答案/ here更新了我的代码，但无济于事。我还检查了代理服务器是否已断开连接。

Answer 1

我能够发现我POST的服务器只接受具有安全协议TLS 1.1及更高版本的请求。该应用程序在.NET 3.5上运行，仅支持SSL和TLS 1.0协议。解决方案是将应用程序升级到.NET 4.5并使用TLS 1.1及更高版本向HTTP服务发出请求。

System.Net.WebException：基础连接已关闭：发送时发生意外错误

1 个答案: