Personal Site Starter Kit

Re: Unable to read data from the transport connection: net_io_connectionclosed

RonnieStokie — Tue, 21 Jul 2009 16:25:40 GMT

""""""""""""""""The other thing that can cause this problem... if mail server and the server hosting your code are two different boxes, it can also be a permissions issue. The mail server must allow SMTP connections from the server hosting your code. Grant the server hosting your code permissions to initiate an SMTP connection with the mail server and that can solve this problem.""""""""""""""""""""""

How do you do this?

Re: Unable to read data from the transport connection: net_io_connectionclosed

tvietnhat — Thu, 02 Jul 2009 02:10:34 GMT

Right click on Default SMTP virtual server, select Properties, then go to Access tab, click Relay then add the IP address of the computer that send SMTP request to the SMTP server.

Hope ths helps

Re: Unable to read data from the transport connection: net_io_connectionclosed

DarkleafNightwanderer — Fri, 29 May 2009 17:00:41 GMT

Vike:
The other thing that can cause this problem... if mail server and the server hosting your code are two different boxes, it can also be a permissions issue. The mail server must allow SMTP connections from the server hosting your code. Grant the server hosting your code permissions to initiate an SMTP connection with the mail server and that can solve this problem.

This is very true. I ran into a similar issue. If you are running your exchange server with Virtualization, you need to configure the SmtpClient to the host IP of the Virtual Server, not the physical hosting server name or IP.

Hope this helps someone, took me the better part of two hours of frustration to realize what I was doing wrong.

Peace,

Todd M Stimmell

Principal Software Engineer, CACI Inc.

Re: Unable to read data from the transport connection: net_io_connectionclosed

Vike — Wed, 04 Mar 2009 19:57:01 GMT

The other thing that can cause this problem... if mail server and the server hosting your code are two different boxes, it can also be a permissions issue. The mail server must allow SMTP connections from the server hosting your code. Grant the server hosting your code permissions to initiate an SMTP connection with the mail server and that can solve this problem.

Re: Unable to read data from the transport connection: net_io_connectionclosed

Peter Strömblad — Sat, 17 Jan 2009 14:51:56 GMT

Tried all the solutions above, and they don't fix this. The problem is that the connection to the mailserver isn't closed properly. It times out at the mailserver, then the .net connection (with or without pooling) on the webserver times out from being idle too long. We've had all sorts of random errors, all relating down to the same re-use problem of the smtpClient pooling. The actual problem is that there is no proper way to close the connection once you're done.

Set SmtpClient.ServicePoint.MaxIdleTime = 1; according to supported work-around: http://connect.microsoft.com/VisualStudio/feedback/Workaround.aspx?FeedbackID=146711 which makes all smtp work properly.

Here's a complete sample: Njoy / Peter

MailMessage msgMail = new MailMessage();
msgMail.To.Add(new MailAddress("info@somedomain.se"));
msgMail.Subject = "Message from web";
msgMail.IsBodyHtml = true;
msgMail.Body = "Test message";
SmtpClient Client = 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();

Re: Unable to read data from the transport connection: net_io_connectionclosed

wuxia0074 — Mon, 15 Sep 2008 19:37:02 GMT

Thanks a lot.

Assigning a static IP solved the problem

rvidal:
Unable to read data from the transport connection: net_io_connectionclosed

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)

Re: Unable to read data from the transport connection: net_io_connectionclosed

raghav_khunger — Mon, 15 Sep 2008 10:06:07 GMT

You have specified wrong

smtpClient.Host

or u havenot supplied smtpClient.Host

Mark as Answer if it helps u.

Re: Unable to read data from the transport connection: net_io_connectionclosed

erikkl2000 — Sun, 24 Aug 2008 04:35:13 GMT

Thanks man this helped me out a lot!

Erik

Re: Unable to read data from the transport connection: net_io_connectionclosed

lberan — Fri, 25 Apr 2008 16:04:41 GMT

i also have the same problem. after i tried all the suggestions, i now get this error message:

The remote name could not be resolved:

Re: Unable to read data from the transport connection: net_io_connectionclosed

wickedhangover — Mon, 18 Feb 2008 00:50:01 GMT

I am also getting this problem but randomnly and I cannot figure out what is going on. The IP address of the mail server is fixed. The machine running the web application does not have SMTP installed. The email addresses are valid and the email server is setup to allow the relay to take place. Any other possibilities I am not looking at?

Re: Unable to read data from the transport connection: net_io_connectionclosed

thduttonuk — Tue, 20 Nov 2007 13:14:55 GMT

This is an SMTP Virtual server issue, load up IIS and

Right click Default SMTP Virtual server.
Change IP address to All Unassigned

This should work..

Re: Unable to read data from the transport connection: net_io_connectionclosed

srkrishnakumari — Wed, 29 Aug 2007 11:58:11 GMT

hi i am also facing the same problem

i am using the password recovery control in my aspx page

My Web.config

<?xml version="1.0"?>

</connectionStrings>

<system.web>

</pages>

</assemblies>

</compilation>

</authentication>

<add connectionStringName="defaultConnectionString" applicationName="/JobSiteStarterKit"

description="" requiresUniqueEmail="true" enablePasswordRetrieval="false" minRequiredPasswordLength="4"

minRequiredNonalphanumericCharacters="0"

enablePasswordReset="true" requiresQuestionAndAnswer="true" passwordFormat="Hashed"

name="MyProvider" type="System.Web.Security.SqlMembershipProvider, System.Web, Version=2.0.3500.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/>

</providers>

</membership>

</system.web>

<system.net>

</smtp>

</mailSettings>

</system.net>

</appSettings>

</configuration>

VITWS-10 is my server.. please help me..

Re: Unable to read data from the transport connection: net_io_connectionclosed

gdl — Sat, 18 Aug 2007 05:51:09 GMT

The error usually happens when the smtp server does not recognize the email address in the "from" field. Make sure you set the "from" with an email address that actualy exists in your smtp server.

See code below for an example, note how the email server used in the email of the "from" field is the same as the one specified as the smtp server:

Dim from As String = "me@youremailserver.com"

Dim recipientEmail As String = "someone@someamailserver.com"

Dim m As New MailMessage(from, recipientEmail)

m.Subject = subject

m.Body = message & sb.ToString

Dim client As New SmtpClient("youremailserver.com")

client.Send(m)

Re: Unable to read data from the transport connection: net_io_connectionclosed

rvidal — Fri, 22 Jun 2007 17:14:03 GMT

Unable to read data from the transport connection: net_io_connectionclosed

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)

Re: Unable to read data from the transport connection: net_io_connectionclosed

rvidal — Fri, 22 Jun 2007 15:04:48 GMT

Hi,it's me again,i did what you told me and i overcame the former message,

In my code i assigned my machine name as administrator/Computos8,you know the username and machine name.

and now i get the following message.

The remote name could not be resolved: 'administrator/Computos8.

Thank you.

Ray