Windows 2003 ASP v1.1 mailer error: 'failed to connect to server', only sometimes..

[Brock Hensley]

A client has setup a simple test.aspx mail script, he reports that it works
sometimes, othertimes he receives the error below. What could cause the
script to work sometimes but not others? No bounce back messages, just 'The
transport failed to connect to the server'

Script:
----------------------------------------
Here's the code behind for the test.aspx:
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
'Put user code to initialize the page here
SendEmail(to@hisdomain.com, "info@fromdomain.com", "subject", "body",
Mail.MailFormat.Html, Mail.MailPriority.Normal)
End Sub

Private Sub SendEmail(ByVal TO_ADDRESS As String, ByVal FROM_ADDRESS As
String, ByVal SUBJECT As String, ByVal BODY As String, ByVal BODY_FORMAT As
System.Web.Mail.MailFormat, ByVal PRIORITY As System.Web.Mail.MailPriority,
Optional ByVal CC_ADDRESS As String = "", Optional ByVal BCC_ADDRESS As
String = "")
'Send an email via the framework
'Required params are passed into this sub
Dim objMail As New System.Web.Mail.MailMessage
objMail.To = TO_ADDRESS
objMail.Cc = CC_ADDRESS
objMail.Bcc = BCC_ADDRESS
objMail.From = FROM_ADDRESS
objMail.BodyFormat = BODY_FORMAT
objMail.Priority = PRIORITY
objMail.Subject = SUBJECT
objMail.Body = BODY
System.Web.Mail.SmtpMail.SmtpServer =
ConfigurationSettings.AppSettings("SMTP_IP_ADDRESS")
System.Web.Mail.SmtpMail.Send(objMail)
End Sub

----------------------------------------



Error:
----------------------------------------
Server Error in '/' Application.
--------------------------------------------------------------------------------

The transport failed to connect to the server.
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information
about the error and where it originated in the code.

Exception Details: System.Runtime.InteropServices.COMException: The
transport failed to connect to the server.

Source Error:

An unhandled exception was generated during the execution of the
current web request. Information regarding the origin and location of the
exception can be identified using the exception stack trace below.

Stack Trace:

[COMException (0x80040213): The transport failed to connect to the server.
]

[TargetInvocationException: Exception has been thrown by the target of an
invocation.]
System.RuntimeType.InvokeDispMethod(String name, BindingFlags invokeAttr,
Object target, Object[] args, Boolean[] byrefModifiers, Int32 culture,
String[] namedParameters) +0
System.RuntimeType.InvokeMember(String name, BindingFlags invokeAttr,
Binder binder, Object target, Object[] args, ParameterModifier[] modifiers,
CultureInfo culture, String[] namedParameters) +473
System.Web.Mail.LateBoundAccessHelper.CallMethod(Object obj, String
methodName, Object[] args) +58

[HttpException (0x80004005): Could not access 'CDO.Message' object.]
System.Web.Mail.LateBoundAccessHelper.CallMethod(Object obj, String
methodName, Object[] args) +113
System.Web.Mail.CdoSysHelper.Send(MailMessage message) +1569
System.Web.Mail.SmtpMail.Send(MailMessage message) +153
emaxEPAct.test.SendEmail(String TO_ADDRESS, String FROM_ADDRESS, String
SUBJECT, String BODY, MailFormat BODY_FORMAT, MailPriority PRIORITY, String
CC_ADDRESS, String BCC_ADDRESS)
emaxEPAct.test.Page_Load(Object sender, EventArgs e)
System.Web.UI.Control.OnLoad(EventArgs e) +67
System.Web.UI.Control.LoadRecursive() +35
System.Web.UI.Page.ProcessRequestMain() +750



--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:1.1.4322.2407 ASP.NET
Version:1.1.4322.2407

----------------------------------------



Thanks,
-B