Error while connecting to Microsoft Exchange server using javamail: "com.sun.mail.util.MailConnectException: Couldn't connect to host, port: host name , 993; timeout -1"

Question

I am trying to read mails from my outlook microsoft exchange server. Following is the code:
public void readEmailsFromOutlook(/*String host, String username, String password*/ ) throws MessagingException, IOException {
      String host = "hostname";
      String username = "domain\\username";
      String password = "password"
      // Create empty properties
      Properties props = System.getProperties();
      props.setProperty("mail.smtp.auth","true");
      props.setProperty("mail.store.protocol","imaps");
      props.setProperty("mail.imap.auth.plain.disable","true");
      props.setProperty("mail.imap.host",host);
      props.setProperty("mail.imap.port","993");
      props.setProperty("mail.imap.user",username);
      props.setProperty("mail.imap.pwd",password);
      props.setProperty("mail.imap.debug","true");
      props.setProperty("mail.imap.ssl.protocols","SSL");
      props.setProperty("mail.imap.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
      props.setProperty("mail.imap.socketFactory.fallback", "false");
      props.setProperty("mail.imap.socketFactory.port", "993");
      // Get session
                 Session session = Session.getInstance(props, new ExchangeAuthenticator(username, password));
      session.setDebug(true);
      // Get the store
      Store store = session.getStore("imaps");
      //Store store = session.getStore();
      store.connect(host, username, password);
      // Get folder
      Folder folder = store.getFolder("INBOX");
      folder.open(Folder.READ_ONLY);
      BufferedReader reader = new BufferedReader(new InputStreamReader(
          System.in));
      // Get directory
      Message message[] = folder.getMessages();
      for (int i = 0, n = message.length; i < n; i++) {
        System.out.println(i + ": " + message[i].getFrom()[0] + "\t"
            + message[i].getSubject());
        System.out.println("Read message? [YES to read/QUIT to end]");
        String line = reader.readLine();
        if ("YES".equalsIgnoreCase(line)) {
          System.out.println(message[i].getContent());
        } else if ("QUIT".equalsIgnoreCase(line)) {
          break;
      // Close connection
      folder.close(false);
      store.close();
But it threw the following error:
DEBUG: setDebug: JavaMail version 1.5.1
DEBUG: getProvider() returning javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Oracle]
DEBUG IMAPS: mail.imap.fetchsize: 16384
DEBUG IMAPS: mail.imap.ignorebodystructuresize: false
DEBUG IMAPS: mail.imap.statuscachetimeout: 1000
DEBUG IMAPS: mail.imap.appendbuffersize: -1
DEBUG IMAPS: mail.imap.minidletime: 10
DEBUG IMAPS: trying to connect to host <hostname>,port 993, isSSL true
com.sun.mail.util.MailConnectException: Couldn't connect to host, port: 10.75.250.60, 993; timeout -1;
  nested exception is:
java.net.ConnectException: Connection refused: connect
at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:693)
at javax.mail.Service.connect(Service.java:345)
at javax.mail.Service.connect(Service.java:226)
at com.capgemini.utilities.Utilities.readEmailsFromOutlook(Utilities.java:1261)
Whats wrong with my code?
Please help!!!!

Answer 1

You're using the "imaps" protocol, but you've set properties for the "imap" protocol.  Change all the property names from mail.imap.* to mail.imaps.*.
Also, get rid of all the socket factory properties.
If you still can't connect, see these connection debugging tips.
Most likely you're using the wrong host name or port number.  In almost all cases, it's better to just let JavaMail choose the correct port number.