解决方法：发送邮件到以下服务器失败 SocketException: Permission denied: connect
How to solve: Sending the email to the following server failed SocketException: Permission denied: connect
我在使用 Java 以编程方式发送邮件时遇到问题。我从网络团队那里确认，通过 Java 发送邮件已被防火墙阻止。
但是我能够在我的 windows 命令提示符 中 获得来自 telnet 的响应。请在下面找到详细信息。
用于使用 Javax Mail 发送邮件的代码：
public static void main(String[] args) throws MessagingException {
String host = "mailhost.xxx";
String to = "abc@xyz.edu";
String from = "cde@xyz.edu";
String subject = "test";
String messageText = "body test";
Properties props = System.getProperties();
props.put("mail.host", host);
props.put("mail.transport.protocol", "smtp");
props.put("mail.smtp.port", "25");
// If using authentication, otherwise comment out
props.put("mail.smtp.auth", "true");
// Gmail requires TLS, your server may not
props.put("mail.smtp.starttls.enable", "true");
// Session mailSession = Session.getDefaultInstance(props, null);
Session mailSession = Session.getInstance(props, new javax.mail.Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("username", "password");
}
});
Message msg = new MimeMessage(mailSession);
msg.setFrom(new InternetAddress(from));
InternetAddress[] address = { new InternetAddress(to) };
msg.setRecipients(Message.RecipientType.TO, address);
msg.setSubject(subject);
msg.setSentDate(new Date());
msg.setText(messageText);
Transport transport = mailSession.getTransport("smtp");
// connect with authentication
// transport.connect(host,"myUsername" , "myPassword");
// connect without authentication
transport.connect();
transport.sendMessage(msg, address);
transport.close();
System.out.println("Mail was sent to " + to);
System.out.println(" from " + from);
System.out.println(" using host " + host + ".");
}
使用 Telnet 可以在命令提示符下发送邮件：
远程登录 mailhost.xxx 25
我收到的回复如下：
220 mailhost Microsoft ESMTP MAIL Service ready at Tue, 29 Mar 201
6 23:34:36 -0700
谷歌搜索后，我还尝试在 Eclipse 中设置 JVM 参数，如下所示，不幸的是仍然得到如下所示的异常
-Djava.net.preferIPv4Stack=true
异常：
Exception in thread "main" org.apache.commons.mail.EmailException: Sending the email to the following server failed : mailhost.xxx:25
at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1242)
at org.apache.commons.mail.Email.send(Email.java:1267)
at edu.xxx.pageobject.appcenter.util.ReportGenerator.main(ReportGenerator.java:328)
Caused by: javax.mail.MessagingException: Could not connect to SMTP host: mailhost xxx, port: 25;
nested exception is:
java.net.SocketException: Permission denied: connect
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1282)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:370)
at javax.mail.Service.connect(Service.java:297)
at javax.mail.Service.connect(Service.java:156)
at javax.mail.Service.connect(Service.java:105)
at javax.mail.Transport.send0(Transport.java:168)
at javax.mail.Transport.send(Transport.java:98)
at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1232)
... 2 more
Caused by: java.net.SocketException: Permission denied: connect
at java.net.TwoStacksPlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:579)
at java.net.Socket.connect(Socket.java:528)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:232)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:189)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1250)
... 9 more
让我知道解决上述问题的任何可能的解决方案。
自 :
- 源异常指向权限问题，
- 但您可以使用 telnet 从命令行连接
这不是网络防火墙问题。
你也排除了相关的Java 7 bug。
因此，问题可能来自您的本地 Windows 防火墙，或者您正在使用的任何 Antivirus/firewall。它可能会授予 telnet 权限，但不会授予 Java.
尝试禁用所有本地 firewall/antivirus，并检查 java 是否可以成功连接。如果是这样，请重新启用您的防火墙，并创建一个例外规则以允许您的 Java 应用程序连接到端口 25。
为我的上述问题发布替代解决方案：
由于我们使用的是 Exchange 帐户，因此我们能够使用 EWS（Exchange Web 服务）API 以编程方式发送邮件。
EWS Getting Started Guide Link
我在使用 Java 以编程方式发送邮件时遇到问题。我从网络团队那里确认，通过 Java 发送邮件已被防火墙阻止。 但是我能够在我的 windows 命令提示符 中 获得来自 telnet 的响应。请在下面找到详细信息。
用于使用 Javax Mail 发送邮件的代码：
public static void main(String[] args) throws MessagingException {
String host = "mailhost.xxx";
String to = "abc@xyz.edu";
String from = "cde@xyz.edu";
String subject = "test";
String messageText = "body test";
Properties props = System.getProperties();
props.put("mail.host", host);
props.put("mail.transport.protocol", "smtp");
props.put("mail.smtp.port", "25");
// If using authentication, otherwise comment out
props.put("mail.smtp.auth", "true");
// Gmail requires TLS, your server may not
props.put("mail.smtp.starttls.enable", "true");
// Session mailSession = Session.getDefaultInstance(props, null);
Session mailSession = Session.getInstance(props, new javax.mail.Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("username", "password");
}
});
Message msg = new MimeMessage(mailSession);
msg.setFrom(new InternetAddress(from));
InternetAddress[] address = { new InternetAddress(to) };
msg.setRecipients(Message.RecipientType.TO, address);
msg.setSubject(subject);
msg.setSentDate(new Date());
msg.setText(messageText);
Transport transport = mailSession.getTransport("smtp");
// connect with authentication
// transport.connect(host,"myUsername" , "myPassword");
// connect without authentication
transport.connect();
transport.sendMessage(msg, address);
transport.close();
System.out.println("Mail was sent to " + to);
System.out.println(" from " + from);
System.out.println(" using host " + host + ".");
}
使用 Telnet 可以在命令提示符下发送邮件： 远程登录 mailhost.xxx 25 我收到的回复如下：
220 mailhost Microsoft ESMTP MAIL Service ready at Tue, 29 Mar 201
6 23:34:36 -0700
谷歌搜索后，我还尝试在 Eclipse 中设置 JVM 参数，如下所示，不幸的是仍然得到如下所示的异常
-Djava.net.preferIPv4Stack=true
异常：
Exception in thread "main" org.apache.commons.mail.EmailException: Sending the email to the following server failed : mailhost.xxx:25
at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1242)
at org.apache.commons.mail.Email.send(Email.java:1267)
at edu.xxx.pageobject.appcenter.util.ReportGenerator.main(ReportGenerator.java:328)
Caused by: javax.mail.MessagingException: Could not connect to SMTP host: mailhost xxx, port: 25;
nested exception is:
java.net.SocketException: Permission denied: connect
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1282)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:370)
at javax.mail.Service.connect(Service.java:297)
at javax.mail.Service.connect(Service.java:156)
at javax.mail.Service.connect(Service.java:105)
at javax.mail.Transport.send0(Transport.java:168)
at javax.mail.Transport.send(Transport.java:98)
at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1232)
... 2 more
Caused by: java.net.SocketException: Permission denied: connect
at java.net.TwoStacksPlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:579)
at java.net.Socket.connect(Socket.java:528)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:232)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:189)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1250)
... 9 more
让我知道解决上述问题的任何可能的解决方案。
自 :
- 源异常指向权限问题，
- 但您可以使用 telnet 从命令行连接
这不是网络防火墙问题。
你也排除了相关的Java 7 bug。 因此，问题可能来自您的本地 Windows 防火墙，或者您正在使用的任何 Antivirus/firewall。它可能会授予 telnet 权限，但不会授予 Java.
尝试禁用所有本地 firewall/antivirus，并检查 java 是否可以成功连接。如果是这样，请重新启用您的防火墙，并创建一个例外规则以允许您的 Java 应用程序连接到端口 25。
为我的上述问题发布替代解决方案： 由于我们使用的是 Exchange 帐户，因此我们能够使用 EWS（Exchange Web 服务）API 以编程方式发送邮件。 EWS Getting Started Guide Link