Unable to read data from the transport connection - vb.net

Question

I am getting following exception:
System.Net.Mail.SmtpException: Failure sending mail. --->
System.IO.IOException: Unable to read data from the transport
connection: An existing connection was f orcibly closed by the remote
host. ---> System.Net.Sockets.SocketException: An e xisting 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 s ize) --- End of inner exception stack trace --- at
System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset,
Int32 s ize) at System.Net.DelegatedStream.Read(Byte[] buffer, Int32
offset, Int32 count) at System.Net.BufferedReadStream.Read(Byte[]
buffer, Int32 offset, Int32 coun t) at
System.Net.Mail.SmtpReplyReaderFactory.ReadLines(SmtpReplyReader
caller, B oolean oneLine) at
System.Net.Mail.SmtpReplyReaderFactory.ReadLine(SmtpReplyReader
caller) at System.Net.Mail.SmtpConnection.GetConnection(String host,
Int32 port) at System.Net.Mail.SmtpTransport.GetConnection(String
host, Int32 port) at System.Net.Mail.SmtpClient.GetConnection() at
System.Net.Mail.SmtpClient.Send(MailMessage message) --- End of inner
exception stack trace --- at
System.Net.Mail.SmtpClient.Send(MailMessage message) at
testEmail.Module1.Main() in E:\testEmail\testEmail\Module1.vb:line 17

Answer 1

I've seen this kind of error for different reasons. I found it helpful to enable exception sending (by enabling the serviceDebug tag with the attribute includeExceptionDetailInFaults set to true)
You'd have to add the behaviorConfiguration attribute to the service first
<service behaviorConfiguration="blah" name="blahService" >
and after closing the services tag you have to add
<behaviors>
<behavior name="blah">
<serviceDebug includeExceptionDetailsInFaults="true"/>
</behavior>
</behaviors>