secure imap connection in java

Question

I am trying to connect to our imap server listening on port 993 using a java program I found at :

http://harikrishnan83.wordpress.com/2009/01/24/access-gmail-with-imap-using-java-mail-api/

I am running this program on from Ubuntu. However, I am getting below exception for this :

DEBUG: setDebug: JavaMail version 1.4ea
DEBUG: getProvider() returning javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Sun Microsystems, Inc]
DEBUG: mail.imap.fetchsize: 16384
javax.mail.MessagingException: Unrecognized SSL message, plaintext connection?;
  nested exception is:
    javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
    at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:479)
    at javax.mail.Service.connect(Service.java:275)
    at javax.mail.Service.connect(Service.java:156)
    at org.myorg.IMAP.main(IMAP.java:40)
Caused by: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
    at com.sun.net.ssl.internal.ssl.InputRecord.handleUnknownRecord(InputRecord.java:523)
    at com.sun.net.ssl.internal.ssl.InputRecord.read(InputRecord.java:355)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:798)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1138)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readDataRecord(SSLSocketImpl.java:753)
    at com.sun.net.ssl.internal.ssl.AppInputStream.read(AppInputStream.java:75)
    at com.sun.mail.util.TraceInputStream.read(TraceInputStream.java:97)
    at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
    at java.io.BufferedInputStream.read(BufferedInputStream.java:237)
    at com.sun.mail.iap.ResponseInputStream.read0(ResponseInputStream.java:81)
    at com.sun.mail.iap.ResponseInputStream.readResponse(ResponseInputStream.java:67)
    at com.sun.mail.iap.Response.<init>(Response.java:83)
    at com.sun.mail.imap.protocol.IMAPResponse.<init>(IMAPResponse.java:48)
    at com.sun.mail.imap.protocol.IMAPResponse.readResponse(IMAPResponse.java:122)
    at com.sun.mail.imap.protocol.IMAPProtocol.readResponse(IMAPProtocol.java:230)
    at com.sun.mail.iap.Protocol.<init>(Protocol.java:91)
    at com.sun.mail.imap.protocol.IMAPProtocol.<init>(IMAPProtocol.java:87)
    at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:446)
    ... 3 more

At the end of this post they have suggested : Looks like you have to add imap server’s certificate to your trusted cert store

1. Download imap server’s certificate
2. Locate your cacerts file
3. Use keytool to import the certificate to your cacerts file

However, I am not able to understand how to carry out these steps for an IMAP server running on Windows machine.

Could anybody pl. help me out here?

Answer 1

As the error message suggests, you are problably not connecting to a SSL encrypted port, but to a plaintext port. Please update your question with your actual configuration (host, port, protocol).

If you were missing the certificate, you would get a totally different error message.