Solved

Sending Email - Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.

Posted on 2010-08-18
3
1,560 Views
Last Modified: 2013-11-30
I recently upgraded my computer at work and since then I cannot send email from applications running on my local computer.  This worked before the upgrade.  There is obviously some setting that needs to be tweaked but I don't know what it is.  Below is a very simple example of something that fails.  When it gets to the "theClient.Send(theEmailToSend)" it gets an exception and the message is: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.

When i run this same code on a server as part of a Web application (with "theClient.Host" set to a proper IP address) it works fine.  I've always been able to change the host to "localhost" for my testing, but now it does not work.

Any ideas?

Thanks in advance.



System.Net.Mail.MailMessage theEmailToSend = new System.Net.Mail.MailMessage();

            System.Net.Mail.MailAddress theRecipient = new System.Net.Mail.MailAddress("TimAttaway@mchapusa.com", "Tim Attaway");

            theEmailToSend.To.Add(theRecipient);

            System.Net.Mail.MailAddress FromAddress = new System.Net.Mail.MailAddress("TimAttaway@mchapusa.com", "Tim Attaway");

            theEmailToSend.From = FromAddress;

            theEmailToSend.Body = "This is a simple email.";

            theEmailToSend.IsBodyHtml = false;

            theEmailToSend.Subject = "Email Test";

            System.Net.Mail.SmtpClient theClient = new System.Net.Mail.SmtpClient();

            theClient.Host = "localhost";

            theClient.Port = 25;

            theClient.Send(theEmailToSend);

Open in new window

0
Comment
Question by:TimAttaway
  • 2
3 Comments
 
LVL 2

Accepted Solution

by:
nycynik earned 500 total points
Comment Utility
This could be because the server is not accepting your request.  

- Might be a firewall issue on your local computer, or between you and the server.  
- It might be that the server is not accepting mail from your computer, this is common to prevent spam sending you have to authenticate with the server.
0
 

Author Comment

by:TimAttaway
Comment Utility
Actually the first problem was that SMTP service had never been installed on my local system.  I went to Control Panel -> Add/Remove Programs -> Add/Remove Windows Components -> IIS -> Details and clicked on SMTP Service to get that installed.  The next step was to get th email server to accept mail from my computer.  Thanks.
0
 

Author Closing Comment

by:TimAttaway
Comment Utility
Provided me a direction but did not supply the whole solution.
0

Featured Post

Threat Intelligence Starter Resources

Integrating threat intelligence can be challenging, and not all companies are ready. These resources can help you build awareness and prepare for defense.

Join & Write a Comment

Today I had a very interesting conundrum that had to get solved quickly. Needless to say, it wasn't resolved quickly because when we needed it we were very rushed, but as soon as the conference call was over and I took a step back I saw the correct …
For both online and offline retail, the cross-channel business is the most recent pattern in the B2C trade space.
It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring. It works on many operating systems, in many languages.
Polish reports in Access so they look terrific. Take yourself to another level. Equations, Back Color, Alternate Back Color. Write easy VBA Code. Tighten space to use less pages. Launch report from a menu, considering criteria only when it is filled…

772 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

10 Experts available now in Live!

Get 1:1 Help Now