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Thread: Performance issues with Outlook (IMAP)

  1. #1
    rsaccani is offline New Member
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    Default Performance issues with Outlook (IMAP)

    We are facing the following problem:
    our users use Outlook 2010 (without connector) and have lots of folders in their IMAP account. When Outlook 2010 performs a periodic check of the contents of all these folders, it keeps opening SSL/IMAP connections to the server, about one for each folder to check.
    This slows down incredibly the check (minutes instead of seconds) and loads the server.

    The issue seems to be related to some timeout on the Zimbra server which seems to disconnect IMAP sessions in IDLE state after about 250ms when the client already has another IMAP connectoin in IDLE state (our Outlook cliens have about 3 IMAP sessions each at any time).

    Here is what we can see when Outlook performs a check of all the folders:
    - Outlook opens a new session with the IMAP server
    - It issues a "SELECT <foldername>" command
    - It issues an "IDLE" command usually immediately followed by a "NOOP" command
    - At this point if Outlook manages to issue a new "SELECT" command within about 250ms, then the connection holds
    - If the client can't issue a new command within about 250ms than the server disconnects the client: "imap - dropping connection for user <username>@<domain> (server-initiated)"

    It is quite easy to reproduce the issue:
    - configure outlook for IMAP access with SSL or TLS
    - create some (5-15) folders in the account
    - force a periodic check in outlook (F9)
    - introduce latency (I used ssh port forwarding to hong kong and back, you can probably find smarter ways to do it)

    I couldn't find parameters to tune the 250ms timeout or to change the number of IMAP connections per client allowed to stay in IDLE state.

    Any suggestion?

    Here is a log of one of such transactions:


    2012-04-17 15:29:33,853 TRACE [ImapSSLServer-20] [name=user@domainname.com;ip=192.168.100.125;] imap - C: DONE
    2012-04-17 15:29:33,854 TRACE [ImapSSLServer-20] [name=user@domainname.com;ip=192.168.100.125;] imap - S: b7ss OK IDLE completed
    2012-04-17 15:29:35,513 TRACE [ImapSSLServer-20] [name=user@domainname.com;ip=192.168.100.125;] imap - C: at3m LSUB "" "*"
    2012-04-17 15:29:35,516 TRACE [ImapSSLServer-20] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * LSUB () "/" "Posta indesiderata"
    2012-04-17 15:29:35,517 TRACE [ImapSSLServer-20] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * LSUB () "/" "INBOX/ffffffffffffffffff"
    2012-04-17 15:29:35,517 TRACE [ImapSSLServer-20] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * LSUB () "/" "INBOX/ssssssssssssssssss"
    2012-04-17 15:29:35,517 TRACE [ImapSSLServer-20] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * LSUB () "/" "INBOX/ggggggggggg"
    2012-04-17 15:29:35,518 TRACE [ImapSSLServer-20] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * LSUB () "/" "INBOX/jjjjjjjjjjjjjjjj"
    2012-04-17 15:29:35,518 TRACE [ImapSSLServer-20] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * LSUB () "/" "Posta inviata"
    2012-04-17 15:29:35,518 TRACE [ImapSSLServer-20] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * LSUB () "/" "INBOX/ddddddddddddd"
    2012-04-17 15:29:35,519 TRACE [ImapSSLServer-20] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * LSUB () "/" "Posta eliminata"
    2012-04-17 15:29:35,519 TRACE [ImapSSLServer-20] [name=user@domainname.com;ip=192.168.100.125;] imap - S: at3m OK LSUB completed
    2012-04-17 15:29:39,121 INFO [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - user user@domainname.com authenticated, mechanism=LOGIN [TLS]
    2012-04-17 15:29:39,124 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: gg6e OK [CAPABILITY IMAP4rev1 ACL BINARY CATENATE CHILDREN CONDSTORE ENABLE ESEARCH ESORT I18NLEVEL=1 ID IDLE LIST-EXTENDED LIST-STATUS LITERAL+ LOGIN-REFERRALS MULTIAPPEND NAMESPACE QRESYNC QUOTA RIGHTS=ektx SASL-IR SEARCHRES SORT THREAD=ORDEREDSUBJECT UIDPLUS UNSELECT WITHIN XLIST] LOGIN completed
    2012-04-17 15:29:39,882 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - C: p36x IDLE
    2012-04-17 15:29:39,882 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: + idling
    2012-04-17 15:29:41,646 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - C: DONE
    2012-04-17 15:29:41,647 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: p36x OK IDLE completed
    2012-04-17 15:29:42,371 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - C: ay5w SELECT "INBOX"
    2012-04-17 15:29:42,372 DEBUG [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - opening folder: INBOX
    2012-04-17 15:29:42,377 DEBUG [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - ** iterating (collapseExpunged)
    2012-04-17 15:29:42,377 DEBUG [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - copying message data from existing session: INBOX
    2012-04-17 15:29:42,377 DEBUG [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - paging session during close: INBOX
    2012-04-17 15:29:42,378 DEBUG [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - ** iterating (collapseExpunged)
    2012-04-17 15:29:42,379 DEBUG [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - added [com.zimbra.cs.imap.ImapMessage@101, com.zimbra.cs.imap.ImapMessage@104]
    2012-04-17 15:29:42,379 INFO [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - selected folder INBOX
    2012-04-17 15:29:42,379 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * 2 EXISTS
    2012-04-17 15:29:42,379 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * 0 RECENT
    2012-04-17 15:29:42,379 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * OK [UNSEEN 2] mailbox contains unseen messages
    2012-04-17 15:29:42,379 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * OK [UIDVALIDITY 1] UIDs are valid for this mailbox
    2012-04-17 15:29:42,379 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * OK [UIDNEXT 261] next expected UID is 261
    2012-04-17 15:29:42,379 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * FLAGS (\Answered \Deleted \Draft \Flagged \Seen $Forwarded $MDNSent Forwarded $Junk $NotJunk Junk JunkRecorded NonJunk NotJunk)
    2012-04-17 15:29:42,379 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * OK [PERMANENTFLAGS (\Answered \Deleted \Draft \Flagged \Seen $Forwarded $MDNSent Forwarded \*)] junk-related flags are not permanent
    2012-04-17 15:29:42,380 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * OK [HIGHESTMODSEQ 116] modseq tracked on this mailbox
    2012-04-17 15:29:42,380 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: ay5w OK [READ-WRITE] SELECT completed
    2012-04-17 15:29:43,290 TRACE [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - C: gczd FETCH 2 (UID)
    2012-04-17 15:29:43,293 DEBUG [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - S: * 2 FETCH (UID 260)
    2012-04-17 15:29:43,293 TRACE [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - S: gczd OK FETCH completed
    2012-04-17 15:29:44,803 TRACE [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - C: 2ykz UID FETCH 261:1102 (UID FLAGS)
    2012-04-17 15:29:44,804 TRACE [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - S: 2ykz OK UID FETCH completed
    2012-04-17 15:29:45,675 TRACE [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - C: e7fl UID FETCH 1:260 (UID FLAGS)
    2012-04-17 15:29:45,677 DEBUG [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - S: * 1 FETCH (UID 257 FLAGS (\Seen))
    2012-04-17 15:29:45,678 DEBUG [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - S: * 2 FETCH (UID 260 FLAGS ())
    2012-04-17 15:29:45,678 TRACE [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - S: e7fl OK UID FETCH completed
    2012-04-17 15:29:46,776 TRACE [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - C: 6t8k IDLE
    2012-04-17 15:29:46,777 TRACE [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - S: + idling
    2012-04-17 15:29:47,795 TRACE [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - C: DONE
    2012-04-17 15:29:47,795 TRACE [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - S: 6t8k OK IDLE completed
    2012-04-17 15:29:48,518 TRACE [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - C: vnbx NOOP
    2012-04-17 15:29:48,519 TRACE [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - S: vnbx OK NOOP completed
    2012-04-17 15:29:49,857 TRACE [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - C: fxs7 IDLE
    2012-04-17 15:29:49,858 TRACE [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - S: + idling
    2012-04-17 15:29:50,309 INFO [ImapSSLServer-22] [] imap - dropping connection for user user@domainname.com (server-initiated)
    2012-04-17 15:29:54,178 INFO [ImapSSLServer-21] [name=user@domainname.com;ip=192.168.100.125;] imap - user user@domainname.com authenticated, mechanism=LOGIN [TLS]
    2012-04-17 15:29:54,180 TRACE [ImapSSLServer-21] [name=user@domainname.com;ip=192.168.100.125;] imap - S: am2g OK [CAPABILITY IMAP4rev1 ACL BINARY CATENATE CHILDREN CONDSTORE ENABLE ESEARCH ESORT I18NLEVEL=1 ID IDLE LIST-EXTENDED LIST-STATUS LITERAL+ LOGIN-REFERRALS MULTIAPPEND NAMESPACE QRESYNC QUOTA RIGHTS=ektx SASL-IR SEARCHRES SORT THREAD=ORDEREDSUBJECT UIDPLUS UNSELECT WITHIN XLIST] LOGIN completed
    2012-04-17 15:29:54,936 TRACE [ImapSSLServer-21] [name=user@domainname.com;ip=192.168.100.125;] imap - C: tsz0 IDLE
    2012-04-17 15:29:54,937 TRACE [ImapSSLServer-21] [name=user@domainname.com;ip=192.168.100.125;] imap - S: + idling
    2012-04-17 15:29:55,695 TRACE [ImapSSLServer-21] [name=user@domainname.com;ip=192.168.100.125;] imap - C: DONE
    2012-04-17 15:29:55,696 TRACE [ImapSSLServer-21] [name=user@domainname.com;ip=192.168.100.125;] imap - S: tsz0 OK IDLE completed
    2012-04-17 15:29:56,436 TRACE [ImapSSLServer-21] [name=user@domainname.com;ip=192.168.100.125;] imap - C: l3a4 SELECT "Posta eliminata"
    2012-04-17 15:29:56,438 DEBUG [ImapSSLServer-21] [name=user@domainname.com;ip=192.168.100.125;] imap - opening folder: Posta eliminata
    2012-04-17 15:29:56,441 DEBUG [ImapSSLServer-21] [name=user@domainname.com;ip=192.168.100.125;] imap - copying message data from existing session: Posta eliminata
    2012-04-17 15:29:56,441 DEBUG [ImapSSLServer-21] [name=user@domainname.com;ip=192.168.100.125;] imap - paging session during close: Posta eliminata
    2012-04-17 15:29:56,443 DEBUG [ImapSSLServer-21] [name=user@domainname.com;ip=192.168.100.125;] imap - added []
    2012-04-17 15:29:56,443 INFO [ImapSSLServer-21] [name=user@domainname.com;ip=192.168.100.125;] imap - selected folder Posta eliminata
    2012-04-17 15:29:56,443 TRACE [ImapSSLServer-21] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * 0 EXISTS
    2012-04-17 15:29:56,443 TRACE [ImapSSLServer-21] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * 0 RECENT
    2012-04-17 15:29:56,443 TRACE [ImapSSLServer-21] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * OK [UIDVALIDITY 104] UIDs are valid for this mailbox
    2012-04-17 15:29:56,443 TRACE [ImapSSLServer-21] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * OK [UIDNEXT 264] next expected UID is 264
    2012-04-17 15:29:56,444 TRACE [ImapSSLServer-21] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * FLAGS (\Answered \Deleted \Draft \Flagged \Seen $Forwarded $MDNSent Forwarded $Junk $NotJunk Junk JunkRecorded NonJunk NotJunk)
    2012-04-17 15:29:56,444 TRACE [ImapSSLServer-21] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * OK [PERMANENTFLAGS (\Answered \Deleted \Draft \Flagged \Seen $Forwarded $MDNSent Forwarded \*)] junk-related flags are not permanent
    2012-04-17 15:29:56,444 TRACE [ImapSSLServer-21] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * OK [HIGHESTMODSEQ 104] modseq tracked on this mailbox
    2012-04-17 15:29:56,444 TRACE [ImapSSLServer-21] [name=user@domainname.com;ip=192.168.100.125;] imap - S: l3a4 OK [READ-WRITE] SELECT completed
    2012-04-17 15:29:57,180 TRACE [ImapSSLServer-21] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - C: 40ff IDLE
    2012-04-17 15:29:57,180 TRACE [ImapSSLServer-21] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - S: + idling
    2012-04-17 15:29:57,912 TRACE [ImapSSLServer-21] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - C: DONE
    2012-04-17 15:29:57,913 TRACE [ImapSSLServer-21] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - S: 40ff OK IDLE completed
    2012-04-17 15:29:59,842 TRACE [ImapSSLServer-21] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - C: 6x0n NOOP
    2012-04-17 15:29:59,843 TRACE [ImapSSLServer-21] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - S: 6x0n OK NOOP completed
    2012-04-17 15:30:00,727 TRACE [ImapSSLServer-21] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - C: 2lel IDLE
    2012-04-17 15:30:00,728 TRACE [ImapSSLServer-21] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - S: + idling
    2012-04-17 15:30:01,746 INFO [ImapSSLServer-21] [] imap - dropping connection for user user@domainname.com (server-initiated)
    2012-04-17 15:30:05,871 INFO [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - user user@domainname.com authenticated, mechanism=LOGIN [TLS]
    2012-04-17 15:30:05,872 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: 8h8e OK [CAPABILITY IMAP4rev1 ACL BINARY CATENATE CHILDREN CONDSTORE ENABLE ESEARCH ESORT I18NLEVEL=1 ID IDLE LIST-EXTENDED LIST-STATUS LITERAL+ LOGIN-REFERRALS MULTIAPPEND NAMESPACE QRESYNC QUOTA RIGHTS=ektx SASL-IR SEARCHRES SORT THREAD=ORDEREDSUBJECT UIDPLUS UNSELECT WITHIN XLIST] LOGIN completed
    2012-04-17 15:30:07,182 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - C: 8x6j IDLE
    2012-04-17 15:30:07,183 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: + idling
    2012-04-17 15:30:08,156 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - C: DONE
    2012-04-17 15:30:08,156 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: 8x6j OK IDLE completed
    2012-04-17 15:30:08,891 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - C: wwor SELECT "Posta indesiderata"
    2012-04-17 15:30:08,892 DEBUG [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - opening folder: Posta indesiderata
    2012-04-17 15:30:08,894 DEBUG [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - copying message data from existing session: Posta indesiderata
    2012-04-17 15:30:08,894 DEBUG [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - paging session during close: Posta indesiderata
    2012-04-17 15:30:08,894 DEBUG [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - added []
    2012-04-17 15:30:08,894 INFO [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - selected folder Posta indesiderata
    2012-04-17 15:30:08,895 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * 0 EXISTS
    2012-04-17 15:30:08,895 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * 0 RECENT
    2012-04-17 15:30:08,895 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * OK [UIDVALIDITY 102] UIDs are valid for this mailbox
    2012-04-17 15:30:08,895 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * OK [UIDNEXT 263] next expected UID is 263
    2012-04-17 15:30:08,895 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * FLAGS (\Answered \Deleted \Draft \Flagged \Seen $Forwarded $MDNSent Forwarded $Junk $NotJunk Junk JunkRecorded NonJunk NotJunk)
    2012-04-17 15:30:08,895 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * OK [PERMANENTFLAGS (\Answered \Deleted \Draft \Flagged \Seen $Forwarded $MDNSent Forwarded \*)] junk-related flags are not permanent
    2012-04-17 15:30:08,895 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: * OK [HIGHESTMODSEQ 102] modseq tracked on this mailbox
    2012-04-17 15:30:08,895 TRACE [ImapSSLServer-22] [name=user@domainname.com;ip=192.168.100.125;] imap - S: wwor OK [READ-WRITE] SELECT completed
    2012-04-17 15:30:10,233 TRACE [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - C: 0kbe IDLE
    2012-04-17 15:30:10,234 TRACE [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - S: + idling
    2012-04-17 15:30:10,997 TRACE [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - C: DONE
    2012-04-17 15:30:10,998 TRACE [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - S: 0kbe OK IDLE completed
    2012-04-17 15:30:11,771 TRACE [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - C: 2x54 NOOP
    2012-04-17 15:30:11,771 TRACE [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - S: 2x54 OK NOOP completed
    2012-04-17 15:30:12,526 TRACE [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - C: pc7n IDLE
    2012-04-17 15:30:12,527 TRACE [ImapSSLServer-22] [name=user@domainname.com;mid=3;ip=192.168.100.125;] imap - S: + idling
    2012-04-17 15:30:12,793 INFO [ImapSSLServer-22] [] imap - dropping connection for user user@domainname.com (server-initiated)

  2. #2
    rsaccani is offline New Member
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    Am I the only one with such problem?

  3. #3
    tattodecastro is offline Starter Member
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    Quote Originally Posted by rsaccani View Post
    Am I the only one with such problem?
    Hi,

    I got a few Outlook-based customers with the exactly same problem.

    Did you find out how to get rid this problem?

  4. #4
    rsaccani is offline New Member
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    Quote Originally Posted by tattodecastro View Post
    Did you find out how to get rid this problem?
    Getting rid of Outlook.

    Actually we didn't get rid of Outlook because of this bug, which belongs entirely to Zimbra and, even if the IMAP implementation in Outlook is terrible, there is no excuse for such behavior of the Zimbra server.
    We digged a little bit into the source code and couldn't find any explicit timeout in the Zimbra IMAP implementation. Then the need to investigate further ceased because in the meantime the company decided to abandon Outlook.

    I'm sorry not being of any help. If you can figure it out I would appreciate if you could share information here. Just for the sake of curiosity.

    bye
    Rodolfo Saccani

  5. #5
    tattodecastro is offline Starter Member
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    Quote Originally Posted by rsaccani View Post
    Getting rid of Outlook.

    Actually we didn't get rid of Outlook because of this bug, which belongs entirely to Zimbra and, even if the IMAP implementation in Outlook is terrible, there is no excuse for such behavior of the Zimbra server.
    We digged a little bit into the source code and couldn't find any explicit timeout in the Zimbra IMAP implementation. Then the need to investigate further ceased because in the meantime the company decided to abandon Outlook.

    I'm sorry not being of any help. If you can figure it out I would appreciate if you could share information here. Just for the sake of curiosity.

    bye
    Rodolfo Saccani
    Thank you for sharing the info.

    I will let you know if we find another way.

  6. #6
    bitzu is offline Starter Member
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    Same problem here. Did anyone find a solution for this?
    What I have tried is to increase the number of threads from 100 (default) to 500.
    This is in Configure - Global Settings - IMAP - Number of Threads.

    I don't know if this would help. I just modify this and I am waiting until tomorrow in order to see.

    What is extremely annoying is that I have several Zimbra implementations and the problem occur with the smallest one, like 25 mailboxes, but here the users has a lot of folders...

    Thanks

  7. #7
    rimon is offline New Member
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    Did u try disabling NIO Buffering for IMAP!!!

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