Question

我有一个用[C＃]编写的Windows服务程序。使用VS 2010的网络，每天一次点击数据库，如果有任何记录需要解决。这些记录所有者将通过Exchange服务器发送电子邮件。对于前几个记录，电子邮件发送正常，但可能是4或5电子邮件后我收到错误显示

Service failed at :System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a send. ---> System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. ---> System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host
   at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   --- End of inner exception stack trace ---
   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   at System.Net.FixedSizeReader.ReadPacket(Byte[] buffer, Int32 offset, Int32 count)
   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.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
   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.GetResponse()
   at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.Emit(HttpWebRequest& request)
   at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.ValidateAndEmitRequest(HttpWebRequest& request)

如果我使用断点调试例程，它可以正常工作。但是当我在没有任何断点的情况下运行它时，我得到了上述错误。以下是我的例程发送电子邮件的代码片段：

ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP1);
lock (service)
{
   if (service == null)
      throw new Exception("service is null");
   service.Credentials = new WebCredentials(data[0], data[1]);
   service.Url = new Uri("https://owa.CompanyName.com/ews/exchange.asmx");
   service.Timeout = 1200000;
   EmailMessage message = new EmailMessage(service);
   if (message == null)
       throw new Exception("message is null");
       message.Subject = "Test Email";
       message.Body = "This is a Test EMail Please use the below link to update ";

//message.ToRecipients.Add(docList[0].CreatorEmailID);
       message.ToRecipients.Add("EmailID@gmail.com");
       for (int j = 0; j < emailList.Count; j++)
       {
          message.CcRecipients.Add("EmailID@gmail.com”);
       }
       System.Threading.Thread.Sleep(1000);
       ServicePointManager.ServerCertificateValidationCallback += ignoreCertCallback;
       try
       {
        message.Send();
       }
       finally
       {
       ServicePointManager.ServerCertificateValidationCallback -= ignoreCertCallback;
       }
}

我在这里使用Microsoft Exchange WebService作为Web引用。我试过谷歌搜索它，但它并没有真正帮助我。如果有人能在这个问题上帮助我，我会很高兴。

Answer 1

我的猜测：

Exchange不喜欢您在短时间内打开的连接数量，并认为它受到攻击并随后阻止您建立更多连接。

我要做的第一件事就是重新编写“服务”。您不希望为每条消息实例化一个新消息。只需重用现有对象即可。另外，一次发送一条消息。

或者，请与您的Exchange管理员联系，了解他们是否知道如何通过以下方式重新配置交换，以便让您的垃圾邮件（我的意思是非常重要的消息）通过..;）

Answer 2

让我们看看......

在带有断点的调试器下工作，没有。

也许你需要限制自己。

Answer 3

我有同样的问题，但我的代码在localhost上的调试器下是正确的。当我上传我的应用程序，有人想发送电子邮件时出现此错误。 从传输流中收到意外的EOF或0字节。

try
        {
            string txtBody = "";
            string emailUser = ConfigurationManager.AppSettings["MailAuthUser"];
            string emailPass = ConfigurationManager.AppSettings["MailAuthPass"];
            string mailServer = ConfigurationManager.AppSettings["MailServer"];

            txtBody = "<b>" + ("موضوع:" + "  " + emailmod.Subject + "</b>" + "<br/><br/><b>" + "ارسال کننده: </b>" + emailmod.SenderEmail + "<br/><br/><b>" + "پیام: </b>" + emailmod.Message + "<br/><br/>" + emailmod.PagePath);

            ServicePointManager.ServerCertificateValidationCallback = CertificateValidationCallBack;
            ExchangeService exservice = new ExchangeService();
            AutodiscoverService auservice = new AutodiscoverService(mailServer);
            if (auservice.ServerInfo != null)
            {
                try
                {
                    exservice.AutodiscoverUrl(emailUser);
                }
                catch (AutodiscoverRemoteException ex)
                {
                    //Console.WriteLine("Exception thrown: " + ex.Error.Message);
                }
            }
            else
            {
                exservice.Url = new Uri("https://" + "outlook.apornak.com" + "/EWS/Exchange.asmx");
            }
            exservice.UseDefaultCredentials = true;


            if (exservice.ServerInfo == null)
            {
                exservice.Credentials = new WebCredentials(emailUser, emailPass);
            }

            EmailMessage message = new EmailMessage(exservice);
            message.Subject = "اعلام ایرادات و پیشنهادات";
            message.Body = Resources.Message.AdvMailTemplate.Replace("#$Body$#", txtBody);
            message.ToRecipients.Add("support@apornak.com");
            message.From = "اعلام ایرادات و پیشنهادات";
            message.ReplyTo.Add( emailmod.SenderEmail);
            message.Save();

            message.SendAndSaveCopy();
            return Json(true);
        }
        catch (Exception)
        {
            { return Json(false); }
            throw;
        }

Answer 4

通常，如果存在证书问题，请使用此处进行重新申请，

ServicePointManager.ServerCertificateValidationCallback + = new System.Net.Security.RemoteCertificateValidationCallback（ValidateServerCertificate）;

...和

public static bool ValidateServerCertificate（对象发件人，X509Certificate证书，X509Chain链，SslPolicyErrors sslPolicyErrors） { 返回true; }

Answer 5

在IIS中，未选择ssl证书。或许被Fiddler设置删除了...... 我用makecert命令和eureka重新创建了ssl证书！在https：//

上调用Web服务时出现此错误

基础连接已关闭：发送时发生意外错误

5 个答案: