我正在尝试编写一个基本的控制台应用程序来发送电子邮件。问题是我不断收到 Socket 异常：
尝试以访问权限禁止的方式访问套接字 xxx.xxx.x.xxx:25
我关闭了 Windows 防火墙，但它没有改变任何东西。我尝试在指定或不指定凭据的情况下运行它。我还尝试使用不同的 smtp 服务器，包括端口 25 的 smtp.mail.yahoo.com 和我的凭据，但没有成功。导致这个异常的问题是什么？
我在 Windows 7 上运行 VS2008。下面是我的代码示例和我得到的异常。
static void Main(string[] args)
{
String recipient = "[email protected]";
String sender = "[email protected]";
MailMessage message = new MailMessage();
message.From = new MailAddress(sender);
message.To.Add(new MailAddress(recipient));
message.Subject = "Subject";
message.Body = "Body";
SmtpClient smtp = new SmtpClient
{
Host = "smtp.server",
Port = 25,
EnableSsl = true,
DeliveryMethod = SmtpDeliveryMethod.Network,
//UseDefaultCredentials = false,
//Credentials = new NetworkCredential("validemail", "validpassword"),
Timeout = 3000
};
try
{
smtp.Send(message);
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
我得到的例外是：
System.Net.Mail.SmtpException: Failure sending mail. --->
System.Net.WebException: Unable to connect to the remote server --->
System.Net.Sockets.SocketException: An attempt was made to access a socket in a way forbidden by its access permissions xxx.xxx.x.xxx:25
at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
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& abortSocket
6, 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.SmtpClient.Send(MailMessage message)
--- End of inner exception stack trace ---
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at ...Program.Main(String[] args) in ...\Program.cs:line xxx
