IMAP Implementations - Some work / some fail - Please help!

Hello friends -
We have an application using mail to exchange information between a master site and remote locations. Due to firewall /political restrictions at originating location, we have been forced to use email on some non standard ports (> 15000).
We never seem to have a problem with SMTP. However, I am unable to receive emails using IMAP from one of our vendors. With debug information enabled, I get the following debug trail:
* OK [CAPABILITY IMAP4REV1 LOGIN-REFERRALS STARTTLS AUTH=LOGIN] ns12-1.whatever.com IMAP4rev1 2003.338rh at Mon, 31 Oct 2005 11:19:45 -0500 (EST)
IMAP DEBUG: AUTH: LOGIN
DEBUG: protocolConnect login, host=67.15.186.34, [email protected], password=<non-null>
A0 AUTHENTICATE LOGIN
+ VXNlciBOYW1lAA==
ZGVwb3RAZmllbGRvcmRlci5jb20=
+ UGFzc3dvcmQA
cGFzc3dvcmQ=
javax.mail.MessagingException: * BYE JavaMail Exception: java.io.IOException;
nested exception is:
     com.sun.mail.iap.ConnectionException: * BYE JavaMail Exception: java.io.IOException
     at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:459)
     at javax.mail.Service.connect(Service.java:236)
     at javax.mail.Service.connect(Service.java:137)
     at us.fl.ci.tlh.test.EmailTest.EmailReadTest(EmailTest.java:137)
     at us.fl.ci.tlh.test.EmailTest.main(EmailTest.java:33)
We are also unable to communicate with this service using Outlook Express.
If I try one of the other vendors with the same code set, I get a successful response:
* OK IMAPrev1
A0 CAPABILITY
* CAPABILITY IMAP4 IMAP4rev1 QUOTA
A0 OK CAPABILITY completed
DEBUG: protocolConnect login, host=xxx.xxx.xxx.xxx, [email protected], password=<non-null>
A1 LOGIN [email protected] unencryptedPassword
A1 OK LOGIN completed
DEBUG: connection available -- size: 1
A2 SELECT INBOX
* 0 EXISTS
* 0 RECENT
* FLAGS (\Deleted \Seen \Draft \Answered \Flagged)
* OK [UIDVALIDITY 0]
* OK [PERMANENTFLAGS (\Deleted \Seen \Draft \Answered \Flagged)]
A2 OK [READ-WRITE] SELECT completed
A3 SEARCH UNSEEN ALL
* SEARCH
A3 OK Search completed
unreadMessages.length=0
A4 CLOSE
A4 OK CLOSE completed
DEBUG: added an Authenticated connection -- size: 1
A5 LOGOUT
* BYE Have a nice day
A5 OK Logout completed
DEBUG: IMAPStore connection dead
DEBUG: IMAPStore cleanup, force false
DEBUG: IMAPStore cleanup done
Unfortunately, we'd really like to have both environments availalbe to us in case one of them goes offline.
The hosting provider for the service that is failing continues to insist that they have no problem checking the account with a mozilla product or Outlook Express. They insist that this is a dns issue; which I find difficult to believe.
I'm not sure where to look to get smarter on this; it looks as if the different vendors are using a different authentication scheme (encrypted vs. plain text). Can anyone give me some guidance on how to futher troubleshoot this error?
Thank you!
- cm

The problem sounds like exchange server firewall setting block
your imap request.
it had better to open the port that firewall blocks.
I have met this problem before.when I open the port, works pretty well.
I am not sure your real reason .just a suggestion

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