When trying to connect to a 5.5 Exchange server through IMAP, I find that I cannot do so every time. I suspect that it's because there are no more connections available at the Exchange server, but I'm not sure. Could someone confirm whether this is the case?

Below are the debug messages of a successful connection and an unsuccessful connection.

Success:



DEBUG: getProvider() returning javax.mail.Provider
[STORE,imap,com.sun.mail.imap.IMAPStore,Sun Microsystems, Inc]

* OK Microsoft Exchange IMAP4rev1 server version 5.5.2651.76 (ottexch01.ottawa.hcl.com) ready

A0 CAPABILITY

* CAPABILITY IMAP4 IMAP4rev1 IDLE LITERAL+ LOGIN-REFERRALS MAILBOX-REFERRALS NAMESPACE AUTH=NTLM

A0 OK CAPABILITY completed.

A1 LOGIN jf.seguin ********

A1 OK LOGIN completed.

A2 LIST "" inbox

* LIST (Marked) "/" INBOX

A2 OK LIST completed.

A3 STATUS INBOX (MESSAGES RECENT UNSEEN UIDNEXT UIDVALIDITY)

* STATUS INBOX (MESSAGES 31 RECENT 31 UIDNEXT 35165 UIDVALIDITY 4683 UNSEEN 0)

A3 OK STATUS completed.

A4 LOGOUT

* BYE Microsoft Exchange IMAP4rev1 server version 5.5.2651.76 signing off

Failure:



DEBUG: getProvider() returning javax.mail.Provider
[STORE,imap,com.sun.mail.imap.IMAPStore,Sun Microsystems, Inc]

javax.mail.MessagingException: Connection refused: no further information;

nested exception is:

java.net.ConnectException: Connection refused: no further information

at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:136)

at javax.mail.Service.connect(Service.java:221)

at javax.mail.Service.connect(Service.java:127)

at TestImap.main(TestImap.java:30)