Question

ASP.NET 3.5 Sending Email

Asked by: Fraser_Admin

I'm getting the following error:
Unable to read data from the transport connection: net_io_connectionclosed

email_server is an actual ip address of our email server.  i just stuck in the defaultcredentials and port because i seen it in other examples.  i never had to do this in asp 1.1.

Any ideas here...

Web.config smtp section..
<mailSettings>
<smtp from="me@mycompany.com">
<network host="email_server" port="25" defaultCredentials="true"/>
</smtp>
            </mailSettings>

Public Sub SendEmail(ByVal lblUnsuccessful As Label)
        Try
            Dim msgMail As New MailMessage()
            msgMail.[To].Add(New MailAddress("me@mycompany.com"))
            msgMail.Subject = "Message from web"
            msgMail.IsBodyHtml = True
            msgMail.Body = "Test message"
            Dim Client As New SmtpClient()
            ' uses settings form web.config 
            Client.ServicePoint.MaxIdleTime = 1
            ' without this the connection is idle too long and not terminated, times out at the server and gives sequencing errors 
            Client.Send(msgMail)
            msgMail.Dispose()
        Catch exp As Exception
            AssignErrorMessage(lblUnsuccessful, exp)
            lblUnsuccessful.Text &= "Problem with email<br>"
            Exit Sub
        End Try
 
 
    End Sub

                                  
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Asked On
2009-10-13 at 08:14:29ID24808069
Topics

.NET Framework 3.x versions

,

Programming for ASP.NET

,

.NET

Participating Experts
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Answers

 

by: carlnorrbomPosted on 2009-10-13 at 08:20:19ID: 25560920

Hi,

Does the smtp server require authentication or not? You just mention that you supply default credentials now and that you did not have to in 1.1?!? If you didn't provide credentials in 1.1 you shouldn't provide them in 3.5 either. The requirement of authentication is on the smtp server, it has nothing to do with which version of the framework you are using.

/Carl.

 

by: Fraser_AdminPosted on 2009-10-13 at 08:47:35ID: 25561193

i have never authenticated in code.  i don't  think it does require it.  i removed the port and authtication bit, so now all i see is the host, but i still have the same issue.

 

by: DotNetChanoPosted on 2009-10-13 at 09:36:34ID: 25561676

The following was copied from here

http://forums.asp.net/t/924682.aspx

_____________________________________________________________________________________

What this error means is that System.net.mail was unable to find the smtp server.

The answer will vary depending on whether you have a fixed IP or a dynamic IP but,
basically, you need to assign a valid IP to your smtp server.

With fixed IP's this is relatively straightforward.
With dynamic IP's it takes a bit of tweaking.

Open the IIS Manager and check the properties for the smtp server.

In the Default SMTP Virtual Server's properties, in the "Access" tab,
in the Connection Control and Relay dialogs, make sure that your local IP is assigned.
( In my case, it's 10.0.0.2... )

You may also need to modify your hosts file, to point 127.0.0.1 to your machine name.
( \WINDOWS\system32\drivers\etc\hosts )

Then, in your code, assign your machine name to the smtp client :

Dim client As New SmtpClient("yourmachinename")
client.Send(mail)

Juan T. Llibre

******AGAIN***** THE ABOVE IS COPIED FROM A POST IN THE LINK

 

by: Fraser_AdminPosted on 2009-10-13 at 10:06:34ID: 25561961

I don't see anything about SMTP in IIS configuration.    I don't have an access tab?

I'm accessing an exchange server on my domain with a static IP address.  

 

by: carlnorrbomPosted on 2009-10-13 at 10:58:58ID: 25562446

Hi,

Have you been able to access the smtp service running on that particular server before? If you run your legacy 1.1 code now against the same server, does it work?

/Carl.

 

by: Fraser_AdminPosted on 2009-10-13 at 11:08:38ID: 25562538

yes

 

by: Fraser_AdminPosted on 2009-10-13 at 11:37:15ID: 25562816

does anyone else have a similar setup they can post a sample.  i have an exchange server on my local domain.  i just want to send a simple email using it.  my pc is setup to allow relaying to the server.  what exactly should i have in my web.config.  in other versions of .net and sql server db mail i have never had to specify a port or a username/password.

thanks

 

by: Fraser_AdminPosted on 2009-10-13 at 12:46:45ID: 25563685

ok i have no clue why it has changed that i'm no longer aloud to use my excahnge server to send the email, but i have to put in localhost for it not to throw an error.  so now it runs, but the email never comes.

 

by: carlnorrbomPosted on 2009-10-13 at 14:48:19ID: 25565150

Hi,

well, there is nothing wrong with your code, thats why i wanted you to test your legacy code. You need to find an smtp server to service your mail, it will not work with localhost. Check and see if your ISP has an smtp you can relay through.

/Carl.

 

by: Fraser_AdminPosted on 2009-10-14 at 04:30:01ID: 25569253

it is on a local intranet.  the exchange server and my machine are on the same domain.  i have never had any issues with .net 1.1 or sql server to send emails.  my machine is allowed to relay on the exchange server.

 

by: Fraser_AdminPosted on 2009-10-14 at 04:54:40ID: 25569429

I am not our network administrator so i don't know a lot about exchange server.  What I do know is that we have a server which is our domain controller and exchange server.  I am using a machine which is on the same domain as this machine.  I found an article:
HOW TO: Set Up and Configure an SMTP Virtual server in Windows 2000.

What I'm wondering is do I now need an SMTP Virtual server in order to accomplish this.  I went onto the box into IIS to see what was setup here and SMTP Virtual server is not setup on that box.  Do I need to install this and have realying allowed on my machine in order to do this?

My machine is already specified as being allowed to relay in exchange server.

20120131-EE-VQP-002

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