Some get error failure sending mail ( System.Net.Mail )

[satnamsarai]

Using System.Net.Mail : Sometimes I get error 'failure sending mail.
Unable to write data to the transport connection: An existing
connection was forcibly closed by the remote host.' Not sure how to
fix this error.

I am able to send messages sometimes both other times randomly
following error appear
EXCEPTION:
Exception of type 'System.Web.Htt pUnhandledExcep tion' was thrown.
at System.Web.UI.P age.HandleError (Exception e)
at System.Web.UI.P age.ProcessRequ estMain(Boolean
includeStagesBe foreAsyncPoint, Boolean includeStagesAf terAsyncPoint)
at System.Web.UI.P age.ProcessRequ est(Boolean
includeStagesBe foreAsyncPoint, Boolean includeStagesAf terAsyncPoint)
at System.Web.UI.P age.ProcessRequ est()
at System.Web.UI.P age.ProcessRequ estWithNoAssert (HttpContext
context)
at System.Web.UI.P age.ProcessRequ est(HttpContext context)
at ASP.coursecert_ presenter_main_ aspx.ProcessReq uest(HttpContex t
context)
at
System.Web.Http Application.Cal lHandlerExecuti onStep.System.W eb.HttpApplicat ion.IExecutionS tep.Execute()
at System.Web.Http Application.Exe cuteStep(IExecu tionStep step,
Boolean& completedSynchr onously)
INNER EXCEPTION:
Failure sending mail.
at System.Net.Mail .SmtpClient.Sen d(MailMessage message)
at coursecert.util ity.SendEmail(O bject from_email, Object
from_name, Object to_email, Object email_subject, Object
email_message)
at coursecert.util ity.SendAMail(S tring email_subject, String
email_message, Int32 cert_tracking_i d, String email_to)
at ASP.coursecert_ presenter_main_ aspx.SendMail(I nt32 message_ind)
at
ASP.coursecert_ presenter_main_ aspx.btnSendtoP RODUCTION_click (Object
sender, EventArgs e)
at System.Web.UI.W ebControls.Butt on.OnClick(Even tArgs e)
at System.Web.UI.W ebControls.Butt on.RaisePostBac kEvent(String
eventArgument)
at
System.Web.UI.W ebControls.Butt on.System.Web.U I.IPostBackEven tHandler.RaiseP ostBackEvent(St ring
eventArgument)
at System.Web.UI.P age.RaisePostBa ckEvent(IPostBa ckEventHandler
sourceControl, String eventArgument)
at System.Web.UI.P age.RaisePostBa ckEvent(NameVal ueCollection
postData)
at System.Web.UI.P age.ProcessRequ estMain(Boolean
includeStagesBe foreAsyncPoint, Boolean
includeStagesAf terAsyncPoint)
INNER EXCEPTION:
Unable to write data to the transport connection: An existing
connection was forcibly closed by the remote host.
at System.Net.Sock ets.NetworkStre am.Write(Byte[] buffer, Int32
offset, Int32 size)
at System.Net.Pool edStream.Write( Byte[] buffer, Int32 offset, Int32
size)
at System.Net.Mail .SmtpConnection .Flush()
at System.Net.Mail .CheckCommand.S end(SmtpConnect ion conn, String&
response)
at System.Net.Mail .MailCommand.Se nd(SmtpConnecti on conn, Byte[]
command, String from)
at System.Net.Mail .SmtpTransport. SendMail(MailAd dress sender,
MailAddressColl ection recipients, String deliveryNotify,
SmtpFailedRecip ientException& exception)
at System.Net.Mail .SmtpClient.Sen d(MailMessage message)
INNER EXCEPTION:
An existing connection was forcibly closed by the remote host
at System.Net.Sock ets.Socket.Send (Byte[] buffer, Int32 offset,
Int32 size, SocketFlags socketFlags)
at System.Net.Sock ets.NetworkStre am.Write(Byte[] buffer, Int32
offset, Int32 size)

[David R. Longnecker]

>An existing connection was forcibly closed by the remote host

Without seeing any code, the first thing that comes to mind (and has caught
me on a few projects) has been various anti-virus softwares blocking port
25 or the SMTP server you're using hasn't been provided with the correct
authentication information.

If you can, post up your code.

-dl

--
David R. Longnecker
http://blog.tiredstudent.com

Using System.Net.Mail : Sometimes I get error 'failure sending mail.
Unable to write data to the transport connection: An existing
connection was forcibly closed by the remote host.' Not sure how to
fix this error.

I am able to send messages sometimes both other times randomly
following error appear

EXCEPTION:
Exception of type 'System.Web.Htt pUnhandledExcep tion' was thrown.
at System.Web.UI.P age.HandleError (Exception e)
at System.Web.UI.P age.ProcessRequ estMain(Boolean
includeStagesBe foreAsyncPoint, Boolean includeStagesAf terAsyncPoint)
at System.Web.UI.P age.ProcessRequ est(Boolean
includeStagesBe foreAsyncPoint, Boolean includeStagesAf terAsyncPoint)
at System.Web.UI.P age.ProcessRequ est()
at System.Web.UI.P age.ProcessRequ estWithNoAssert (HttpContext
context)
at System.Web.UI.P age.ProcessRequ est(HttpContext context)
at ASP.coursecert_ presenter_main_ aspx.ProcessReq uest(HttpContex t
context)
at
System.Web.Http Application.Cal lHandlerExecuti onStep.System.W eb.HttpApp
lication.IExecu tionStep.Execut e()
at System.Web.Http Application.Exe cuteStep(IExecu tionStep step,
Boolean& completedSynchr onously)
INNER EXCEPTION:
Failure sending mail.
at System.Net.Mail .SmtpClient.Sen d(MailMessage message)
at coursecert.util ity.SendEmail(O bject from_email, Object
from_name, Object to_email, Object email_subject, Object
email_message)
at coursecert.util ity.SendAMail(S tring email_subject, String
email_message, Int32 cert_tracking_i d, String email_to)
at ASP.coursecert_ presenter_main_ aspx.SendMail(I nt32 message_ind)
at
ASP.coursecert_ presenter_main_ aspx.btnSendtoP RODUCTION_click (Object
sender, EventArgs e)
at System.Web.UI.W ebControls.Butt on.OnClick(Even tArgs e)
at System.Web.UI.W ebControls.Butt on.RaisePostBac kEvent(String
eventArgument)
at
System.Web.UI.W ebControls.Butt on.System.Web.U I.IPostBackEven tHandler.R
aisePostBackEve nt(String
eventArgument)
at System.Web.UI.P age.RaisePostBa ckEvent(IPostBa ckEventHandler
sourceControl, String eventArgument)
at System.Web.UI.P age.RaisePostBa ckEvent(NameVal ueCollection
postData)
at System.Web.UI.P age.ProcessRequ estMain(Boolean
includeStagesBe foreAsyncPoint, Boolean
includeStagesAf terAsyncPoint)
INNER EXCEPTION:
Unable to write data to the transport connection: An existing
connection was forcibly closed by the remote host.
at System.Net.Sock ets.NetworkStre am.Write(Byte[] buffer, Int32
offset, Int32 size)
at System.Net.Pool edStream.Write( Byte[] buffer, Int32 offset, Int32
size)
at System.Net.Mail .SmtpConnection .Flush()
at System.Net.Mail .CheckCommand.S end(SmtpConnect ion conn, String&
response)
at System.Net.Mail .MailCommand.Se nd(SmtpConnecti on conn, Byte[]
command, String from)
at System.Net.Mail .SmtpTransport. SendMail(MailAd dress sender,
MailAddressColl ection recipients, String deliveryNotify,
SmtpFailedRecip ientException& exception)
at System.Net.Mail .SmtpClient.Sen d(MailMessage message)
INNER EXCEPTION:
An existing connection was forcibly closed by the remote host
at System.Net.Sock ets.Socket.Send (Byte[] buffer, Int32 offset,
Int32 size, SocketFlags socketFlags)
at System.Net.Sock ets.NetworkStre am.Write(Byte[] buffer, Int32
offset, Int32 size)

[satnamsarai]

On Sep 21, 11:24 am, David R. Longnecker
<dlongnec...@co mmunity.nospamw rote:

An existing connection was forcibly closed by the remote host

Without seeing any code, the first thing that comes to mind (and has caught
me on a few projects) has been various anti-virus softwares blocking port
25 or the SMTP server you're using hasn't been provided with the correct
authentication information.

If you can, post up your code.

-dl

--
David R. Longneckerhttp://blog.tiredstude nt.com

Using System.Net.Mail : Sometimes I get error 'failure sending mail.
Unable to write data to the transport connection: An existing
connection was forcibly closed by the remote host.' Not sure how to
fix this error.

I am able to send messages sometimes both other times randomly
following error appear

EXCEPTION:
Exception of type 'System.Web.Htt pUnhandledExcep tion' was thrown.
at System.Web.UI.P age.HandleError (Exception e)
at System.Web.UI.P age.ProcessRequ estMain(Boolean
includeStagesBe foreAsyncPoint, Boolean includeStagesAf terAsyncPoint)
at System.Web.UI.P age.ProcessRequ est(Boolean
includeStagesBe foreAsyncPoint, Boolean includeStagesAf terAsyncPoint)
at System.Web.UI.P age.ProcessRequ est()
at System.Web.UI.P age.ProcessRequ estWithNoAssert (HttpContext
context)
at System.Web.UI.P age.ProcessRequ est(HttpContext context)
at ASP.coursecert_ presenter_main_ aspx.ProcessReq uest(HttpContex t
context)
at
System.Web.Http Application.Cal lHandlerExecuti onStep.System.W eb.HttpApp
lication.IExecu tionStep.Execut e()
at System.Web.Http Application.Exe cuteStep(IExecu tionStep step,
Boolean& completedSynchr onously)
INNER EXCEPTION:
Failure sending mail.
at System.Net.Mail .SmtpClient.Sen d(MailMessage message)
at coursecert.util ity.SendEmail(O bject from_email, Object
from_name, Object to_email, Object email_subject, Object
email_message)
at coursecert.util ity.SendAMail(S tring email_subject, String
email_message, Int32 cert_tracking_i d, String email_to)
at ASP.coursecert_ presenter_main_ aspx.SendMail(I nt32 message_ind)
at
ASP.coursecert_ presenter_main_ aspx.btnSendtoP RODUCTION_click (Object
sender, EventArgs e)
at System.Web.UI.W ebControls.Butt on.OnClick(Even tArgs e)
at System.Web.UI.W ebControls.Butt on.RaisePostBac kEvent(String
eventArgument)
at
System.Web.UI.W ebControls.Butt on.System.Web.U I.IPostBackEven tHandler.R
aisePostBackEve nt(String
eventArgument)
at System.Web.UI.P age.RaisePostBa ckEvent(IPostBa ckEventHandler
sourceControl, String eventArgument)
at System.Web.UI.P age.RaisePostBa ckEvent(NameVal ueCollection
postData)
at System.Web.UI.P age.ProcessRequ estMain(Boolean
includeStagesBe foreAsyncPoint, Boolean
includeStagesAf terAsyncPoint)
INNER EXCEPTION:
Unable to write data to the transport connection: An existing
connection was forcibly closed by the remote host.
at System.Net.Sock ets.NetworkStre am.Write(Byte[] buffer, Int32
offset, Int32 size)
at System.Net.Pool edStream.Write( Byte[] buffer, Int32 offset, Int32
size)
at System.Net.Mail .SmtpConnection .Flush()
at System.Net.Mail .CheckCommand.S end(SmtpConnect ion conn, String&
response)
at System.Net.Mail .MailCommand.Se nd(SmtpConnecti on conn, Byte[]
command, String from)
at System.Net.Mail .SmtpTransport. SendMail(MailAd dress sender,
MailAddressColl ection recipients, String deliveryNotify,
SmtpFailedRecip ientException& exception)
at System.Net.Mail .SmtpClient.Sen d(MailMessage message)
INNER EXCEPTION:
An existing connection was forcibly closed by the remote host
at System.Net.Sock ets.Socket.Send (Byte[] buffer, Int32 offset,
Int32 size, SocketFlags socketFlags)
at System.Net.Sock ets.NetworkStre am.Write(Byte[] buffer, Int32
offset, Int32 size)- Hide quoted text -

- Show quoted text -

Here is the code.. It work fine sometimes, but when this function is
called repealy, then it break down!..
Sub sendAmail()
Dim send_mail_ip As String =
System.Configur ation.Configura tionManager.App Settings("send_ mail_ip")
Dim mail As New MailMessage()

If Trim(txtToEmail .Text) <String.Empty And
Trim(send_mail_ ip) <String.Empty Then
Dim smtp As New SmtpClient(Trim (send_mail_ip))
mail.From = New MailAddress(Tri m(txtFromEmail. Text),
Trim(txtFromEma il.Text))
mail.To.Add(Tri m(txtToEmail.Te xt))
mail.Subject = txtSubject.Text
mail.Body = txtMessage.Text

smtp.Send(mail)

lblAlert.Text = "<font color =""green"">Emai l Send</font>"
End If

End Sub