Failure sending mail
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Hi all, Trying to send mail with System.Net.SmtpClient, using very simple code just for testing: SmtpClient smtp = new SmtpClient("mail.server.com", 25); smtp.Credentials = new System.Net.NetworkCredential("user", "password"); try { smtp.Send("sen...@server.com", "recipi...@server.com", "Subject", "Body"); MessageBox.Show("Mail Sent!"); } catch (Exception ex) { txtErrorMsg.Text = ex.ToString(); } BTW, the mail.server.com is not mine, it's an ISP mail server. On my local machine, this code works fine and actualy sending the mail. BUT, on my remote server the same code produces the exceptions as follows: System.Net.Mail.SmtpException: Failure sending mail. ---> System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress) at System.Net.Sockets.Socket.InternalConnect(EndPoint remoteEP) at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Int32 timeout, Exception& exception) --- End of inner exception stack trace --- at System.Net.ServicePoint.GetConnection(PooledStream PooledStream, Object owner, Boolean async, IPAddress& address, Socket& abortSocket, Socket& abortSocket6, Int32 timeout) at System.Net.PooledStream.Activate(Object owningObject, Boolean async, Int32 timeout, GeneralAsyncDelegate asyncCallback) at System.Net.PooledStream.Activate(Object owningObject, GeneralAsyncDelegate asyncCallback) at System.Net.ConnectionPool.GetConnection(Object owningObject, GeneralAsyncDelegate asyncCallback, Int32 creationTimeout) at System.Net.Mail.SmtpConnection.GetConnection(String host, Int32 port) at System.Net.Mail.SmtpTransport.GetConnection(String host, Int32 port) at System.Net.Mail.SmtpClient.GetConnection() at System.Net.Mail.SmtpClient.Send(MailMessage message) --- End of inner exception stack trace --- at System.Net.Mail.SmtpClient.Send(MailMessage message) at System.Net.Mail.SmtpClient.Send(St
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Hi all, Trying to send mail with System.Net.SmtpClient, using very simple code just for testing: SmtpClient smtp = new SmtpClient("mail.server.com", 25); smtp.Credentials = new System.Net.NetworkCredential("user", "password"); try { smtp.Send("sen...@server.com", "recipi...@server.com", "Subject", "Body"); MessageBox.Show("Mail Sent!"); } catch (Exception ex) { txtErrorMsg.Text = ex.ToString(); } BTW, the mail.server.com is not mine, it's an ISP mail server. On my local machine, this code works fine and actualy sending the mail. BUT, on my remote server the same code produces the exceptions as follows: System.Net.Mail.SmtpException: Failure sending mail. ---> System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress) at System.Net.Sockets.Socket.InternalConnect(EndPoint remoteEP) at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Int32 timeout, Exception& exception) --- End of inner exception stack trace --- at System.Net.ServicePoint.GetConnection(PooledStream PooledStream, Object owner, Boolean async, IPAddress& address, Socket& abortSocket, Socket& abortSocket6, Int32 timeout) at System.Net.PooledStream.Activate(Object owningObject, Boolean async, Int32 timeout, GeneralAsyncDelegate asyncCallback) at System.Net.PooledStream.Activate(Object owningObject, GeneralAsyncDelegate asyncCallback) at System.Net.ConnectionPool.GetConnection(Object owningObject, GeneralAsyncDelegate asyncCallback, Int32 creationTimeout) at System.Net.Mail.SmtpConnection.GetConnection(String host, Int32 port) at System.Net.Mail.SmtpTransport.GetConnection(String host, Int32 port) at System.Net.Mail.SmtpClient.GetConnection() at System.Net.Mail.SmtpClient.Send(MailMessage message) --- End of inner exception stack trace --- at System.Net.Mail.SmtpClient.Send(MailMessage message) at System.Net.Mail.SmtpClient.Send(St
I'd guess that your ISP rejects connections from IP addresses that do not belong to them.
Christian Graus - Microsoft MVP - C++ "also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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Hi all, Trying to send mail with System.Net.SmtpClient, using very simple code just for testing: SmtpClient smtp = new SmtpClient("mail.server.com", 25); smtp.Credentials = new System.Net.NetworkCredential("user", "password"); try { smtp.Send("sen...@server.com", "recipi...@server.com", "Subject", "Body"); MessageBox.Show("Mail Sent!"); } catch (Exception ex) { txtErrorMsg.Text = ex.ToString(); } BTW, the mail.server.com is not mine, it's an ISP mail server. On my local machine, this code works fine and actualy sending the mail. BUT, on my remote server the same code produces the exceptions as follows: System.Net.Mail.SmtpException: Failure sending mail. ---> System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress) at System.Net.Sockets.Socket.InternalConnect(EndPoint remoteEP) at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Int32 timeout, Exception& exception) --- End of inner exception stack trace --- at System.Net.ServicePoint.GetConnection(PooledStream PooledStream, Object owner, Boolean async, IPAddress& address, Socket& abortSocket, Socket& abortSocket6, Int32 timeout) at System.Net.PooledStream.Activate(Object owningObject, Boolean async, Int32 timeout, GeneralAsyncDelegate asyncCallback) at System.Net.PooledStream.Activate(Object owningObject, GeneralAsyncDelegate asyncCallback) at System.Net.ConnectionPool.GetConnection(Object owningObject, GeneralAsyncDelegate asyncCallback, Int32 creationTimeout) at System.Net.Mail.SmtpConnection.GetConnection(String host, Int32 port) at System.Net.Mail.SmtpTransport.GetConnection(String host, Int32 port) at System.Net.Mail.SmtpClient.GetConnection() at System.Net.Mail.SmtpClient.Send(MailMessage message) --- End of inner exception stack trace --- at System.Net.Mail.SmtpClient.Send(MailMessage message) at System.Net.Mail.SmtpClient.Send(St
You may be able to authenticate to your isp's smtp server by passing it your user credentials. Alteratively, consider using the windows server SMTP service. "You're very clever, young man, very clever," said the old lady. "But it's turtles all the way down!"