The remote name could not be resolved

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I tried to send email in my site but I got this Error:
please help... :(

The remote name could not be resolved: 'smtp.nimanaqipour.com'

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.Net.WebException: The remote name could not be resolved: 'smtp.nimanaqipour.com'

Source Error:

Line 31:
Line 32: SmtpClient mySmtpClient = new SmtpClient();
Line 33: mySmtpClient.Send(myMessage);
Line 34: }
Line 35: }

Source File: c:\inetpub\whosts\nimanaqipour.com\httpdocs\Index.aspx.cs Line: 33

Stack Trace:

[WebException: The remote name could not be resolved: 'smtp.nimanaqipour.com']
System.Net.ServicePoint.GetConnection(PooledStream PooledStream, Object owner, Boolean async, IPAddress& address, Socket& abortSocket, Socket& abortSocket6, Int32 timeout) +5483851
System.Net.PooledStream.Activate(Object owningObject, Boolean async, Int32 timeout, GeneralAsyncDelegate asyncCallback) +202
System.Net.PooledStream.Activate(Object owningObject, GeneralAsyncDelegate asyncCallback) +21
System.Net.ConnectionPool.GetConnection(Object owningObject, GeneralAsyncDelegate asyncCallback, Int32 creationTimeout) +332
System.Net.Mail.SmtpConnection.GetConnection(String host, Int32 port) +160
System.Net.Mail.SmtpTransport.GetConnection(String host, Int32 port) +159
System.Net.Mail.SmtpClient.GetConnection() +35
System.Net.Mail.SmtpClient.Send(MailMessage message) +1213
[SmtpException: Failure sending mail.]
System.Net.Mail.SmtpClient.Send(MailMessage message) +1531
_Default.Button1_Click(Object sender, EventArgs e) in c:\inetpub\whosts\nimanaqipour.com\httpdocs\Index.aspx.cs:33
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +111
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +110
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565

Posted 13-Jul-10 2:40am

Nima.naqipoor

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kurle.nitin · Answer 1 · 2011-10-21T01:47:00

Hi,

I thnk u can do the following way..
Just handle the remote error exception.

C#

try
{
    // try to download file here
}
catch (WebException ex)
{
    if (ex.Status == WebExceptionStatus.ProtocolError)
    {
        if (((HttpWebResponse)ex.Response).StatusCode == HttpStatusCode.NotFound)
        {
            int code = (Int32)response.StatusCode;
            {
                 // handle the 404 here
            }            
        }
    }
}

Johnny J. · Answer 2 · 2010-07-13T02:52:00

In my opinion, this error message is quite self-explanatory: You cannot create a connection to the SMTP server you have specified.

There is probably nothing wrong with your code as it is.

You need to check why you can't access the SMTP server.

For starters, try pinging smtp.nimanaqipour.com from the machine your application is running on.

Sandeep Mewara · Answer 3 · 2010-07-13T03:02:00

If it is having issues resolving the server name, then that is likely a DNS issue on the server. CS simply goes to the connect to the given hostname, and the system will automatically try to resolve the hostname into an IP using the DNS servers the server is configured to use.

Take not of the email server setting in CS, then log into the server, open a command prompt, and type "nslookup youremailserver.com". if it can't resolve it, then you might want to check the DNS settings for the domain, or the DNS servers your server is set up to use.

BTW: Before that, just check it's not the firewall creating the issue. Port being used is open and permissions given.

The remote name could not be resolved

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