Javax.mail.MessagingException: Failed to connect to the SMTP host?

Question

The following is my code to send mail:

import java.util.Properties; import javax.mail.Authenticator; import javax.mail.Message; import javax.mail.Message.RecipientType; import javax.mail.MessagingException; import javax.mail.PasswordAuthentication; import javax.mail.Session; import javax.mail.Transport; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; public class SendMail { public void sendMail(String m_from,String m_to,String m_subject,String m_body){ try { Session m_Session; Message m_simpleMessage; InternetAddress m_fromAddress; InternetAddress m_toAddress; Properties m_properties; m_properties = new Properties(); m_properties.put("mail.smtp.host", "usdc2spam2.slingmedia.com"); m_properties.put("mail.smtp.socketFactory.port", "465"); m_properties.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory"); m_properties.put("mail.smtp.auth", "true"); m_properties.put("mail.smtp.port", "9000"); m_Session=Session.getDefaultInstance(m_properties,new Authenticator() { protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication("aaaaa"," bbbbb@1 "); // username and the password } }); m_simpleMessage = new MimeMessage(m_Session); m_fromAddress = new InternetAddress(m_from); m_toAddress = new InternetAddress(m_to); m_simpleMessage.setFrom(m_fromAddress); m_simpleMessage.setRecipient(RecipientType.TO, m_toAddress); m_simpleMessage.setSubject(m_subject); m_simpleMessage.setContent(m_body, "text/html"); //m_simpleMessage.setContent(m_body,"text/plain"); Transport.send(m_simpleMessage); } catch (MessagingException ex) { ex.printStackTrace(); } } public static void main(String[] args) { SendMail send_mail = new SendMail(); String empName = "xxxxx"; String title ="<b>Hi !"+empName+"</b>"; send_mail.sendMail(" [e-mail] ", " [e-mail] ", "Please apply for leave for the following dates", title+"<br>by<br><b>HR<b>"); } } 

but when I run the code, it gives me the following exception.

 javax.mail.MessagingException: Could not connect to SMTP host: usdc2spam2.slingmedia.com, port: 9000; nested exception is: java.net.ConnectException: Connection refused: connect at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1934) at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:638) at javax.mail.Service.connect(Service.java:317) at javax.mail.Service.connect(Service.java:176) at javax.mail.Service.connect(Service.java:125) at javax.mail.Transport.send0(Transport.java:194) at javax.mail.Transport.send(Transport.java:124) at samples.SendMail.sendMail(SendMail.java:46) at samples.SendMail.main(SendMail.java:55) Caused by: java.net.ConnectException: Connection refused: connect at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.PlainSocketImpl.doConnect(Unknown Source) at java.net.PlainSocketImpl.connectToAddress(Unknown Source) at java.net.PlainSocketImpl.connect(Unknown Source) at java.net.SocksSocketImpl.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:288) at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:231) at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1900) 

when i ping this usdc2spam2.slingmedia.com it gives me an answer without any problems. I am using windows 7

Please help me solve this problem.

Answer 1

These are the two lines that threw me the problem:

 m_properties.put("mail.smtp.socketFactory.port", "465"); m_properties.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory"); 

and added this line:

 m_properties.put("mail.smtp.starttls.enable", "true"); 

After deleting and adding the above lines of code, it worked fine.

Answer 2

Which leads to your problem right in the stack trace:

 java.net.ConnectException: Connection refused: connect 

Do you need a password to connect to the SMTP server? Are you sure you are using the correct settings (as in the port number)? Are you behind a proxy server or firewall? Can you use these settings in a regular mail program (for example, Thunderbird) and send letters?

Answer 3

Try adding port 9000 to your inbound rules in the Windows Firewall.

Answer 4

This exception usually occurs when there is no service listening on the port you are trying to connect to.

Try connecting using putty or telnet . I bet you get the same error.

Check out these things:

• The host name and port you are trying to connect to
• The server is listening correctly, and
• The firewall does not block the connection.