我有以下代码：
String url = // a valid url
String requestXml = File.ReadAllText(filePath);//opens file , reads all text and closes it
byte[] bytes = System.Text.Encoding.ASCII.GetBytes(requestXml);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Credentials = new NetworkCredential("DEFAULT\\Admin", "Admin");
request.ContentType = "application/xml";
request.ContentLength = bytes.Length;
request.Method = "POST";
request.KeepAlive = false;
Stream requestStream = request.GetRequestStream();
requestStream.Write(bytes, 0, bytes.Length);
requestStream.Close();
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream responseStream = response.GetResponseStream();
return new StreamReader(responseStream).ReadToEnd();
在运行时，我在尝试读取时遇到以下异常HTTPWebResponse :
System.Net.WebException：基础连接已关闭：接收时发生意外错误。
---> System.IO.IOException：无法从传输连接读取数据：已建立的连接被主机中的软件中止。
---> System.Net.Sockets.SocketException：已建立的连接被主机中的软件中止
在 System.Net.Sockets.Socket.Receive(Byte[] 缓冲区、Int32 偏移量、Int32 大小、SocketFlags socketFlags)
在 System.Net.Sockets.NetworkStream.Read(Byte[] 缓冲区，Int32 偏移量，Int32 大小)
在 System.Net.Sockets.NetworkStream.Read(Byte[] 缓冲区，Int32 偏移量，Int32 大小)
在 System.Net.PooledStream.Read(Byte[] 缓冲区，Int32 偏移量，Int32 大小)
在System.Net.Connection.SyncRead（HttpWebRequest请求，布尔userRetrievedStream，布尔probeRead）
添加这行代码解决了我的问题：
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
这是取自：https://our.umbraco.com/forum/using-umbraco-and-getting-started/74628-the-underlying-connection-was-filled-an-unexpected-error-occurred-on-a-send
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