Dear Bron Here is what is in the syncserver at the same time - note USER1 matches the prior info for the sync_client. Nov 27 14:22:03 proxy syncserver[18772]: Deleted mailbox DELETED.user.USERX.drafts.49A9E880 Nov 27 14:22:03 proxy syncserver[18772]: Deleted mailbox DELETED.user.USERX.sent.49A9E885 Nov 27 14:22:37 proxy syncserver[18772]: login: brooks.civeng.adelaide.edu.au [129.127.16.1] cyrus DIGEST-MD5 User logged in Nov 27 14:24:43 proxy syncserver[18772]: login: brooks.civeng.adelaide.edu.au [129.127.16.1] cyrus DIGEST-MD5 User logged in Nov 27 14:24:45 proxy syncserver[18772]: Repacking mailbox user.USERY Nov 27 14:25:06 proxy syncserver[18772]: skiplist: checkpointed /maildata/imap/user/m/USERZ.seen (3 records, 400 bytes) in 0 seconds Nov 27 14:25:24 proxy syncserver[18772]: login: brooks.civeng.adelaide.edu.au [129.127.16.1] cyrus DIGEST-MD5 User logged in Nov 27 14:29:09 proxy syncserver[18772]: skiplist: checkpointed /maildata/imap/user/m/USERY.seen (4 records, 424 bytes) in 0 seconds Nov 27 14:29:54 proxy syncserver[18772]: skiplist: checkpointed /maildata/imap/user/l/USERA.seen (5 records, 500 bytes) in 0 seconds Nov 27 14:30:00 proxy syncserver[18772]: login: brooks.civeng.adelaide.edu.au [129.127.16.1] cyrus DIGEST-MD5 User logged in Nov 27 14:30:08 proxy syncserver[18785]: login: brooks.civeng.adelaide.edu.au [129.127.16.1] cyrus DIGEST-MD5 User logged in Nov 27 14:35:05 proxy syncserver[18772]: login: brooks.civeng.adelaide.edu.au [129.127.16.1] cyrus DIGEST-MD5 User logged in Nov 27 14:35:13 proxy syncserver[18785]: login: brooks.civeng.adelaide.edu.au [129.127.16.1] cyrus DIGEST-MD5 User logged in Nov 27 14:38:08 proxy syncserver[18772]: skiplist: checkpointed /maildata/imap/user/c/USER1.seen (19 records, 2820 bytes) in 0 seconds Nov 27 14:39:18 proxy syncserver[18772]: login: brooks.civeng.adelaide.edu.au [129.127.16.1] cyrus DIGEST-MD5 User logged in Nov 27 14:39:42 proxy syncserver[18785]: login: brooks.civeng.adelaide.edu.au [129.127.16.1] cyrus DIGEST-MD5 User logged in Nov 27 14:39:43 proxy syncserver[18785]: Repacking mailbox user.USERA Nov 27 14:39:51 proxy syncserver[18785]: Index upgrade: DELETED.user.USERA.drafts.49A9E61A (10 -> 12) Nov 27 14:39:51 proxy syncserver[18785]: Index upgrade: DELETED.user.USERA.sent.49A9E623 (10 -> 12) Nov 27 14:39:51 proxy syncserver[18785]: Index upgrade: DELETED.user.USERA.trash.49A9E61F (10 -> 12) Nov 27 14:39:51 proxy syncserver[18785]: skiplist: checkpointed /maildata/imap/user/s/USERA.seen (28 records, 2188 bytes) in 0 seconds Nov 27 14:39:51 proxy syncserver[18785]: Deleted mailbox DELETED.user.USERA.drafts.49A9E61A Nov 27 14:39:51 proxy syncserver[18785]: Deleted mailbox DELETED.user.USERA.sent.49A9E623 Nov 27 14:39:51 proxy syncserver[18785]: Deleted mailbox DELETED.user.USERA.trash.49A9E61F Nov 27 14:40:00 proxy syncserver[18772]: login: brooks.civeng.adelaide.edu.au [129.127.16.1] cyrus DIGEST-MD5 User logged in Nov 27 14:40:08 proxy syncserver[18785]: login: brooks.civeng.adelaide.edu.au [129.127.16.1] cyrus DIGEST-MD5 User logged in Nov 27 14:42:24 proxy syncserver[18788]: login: brooks.civeng.adelaide.edu.au [129.127.16.1] cyrus DIGEST-MD5 User logged in Nov 27 14:45:00 proxy syncserver[18790]: login: brooks.civeng.adelaide.edu.au [129.127.16.1] cyrus DIGEST-MD5 User logged in Nov 27 14:45:01 proxy syncserver[18790]: skiplist: checkpointed /maildata/imap/user/s/USERB.seen (50 records, 3968 bytes) in 0 seconds Nov 27 14:45:03 proxy syncserver[18790]: Index upgrade: DELETED.user.USERD.drafts.49A9E7F0 (10 -> 12) Nov 27 14:45:03 proxy syncserver[18790]: Index upgrade: DELETED.user.USERD.sent.49A9E7E7 (10 -> 12) Nov 27 14:45:03 proxy syncserver[18790]: Index upgrade: DELETED.user.USERD.trash.49A9E7E2 (10 -> 12) I did a full reconstruct on sync_client & syncserver after reverting back to 2.3.16 - going OK. The reason I wanted to install 2.4.4 was that a user was getting Thunderbird (IMAP) to freeze and I suspect it was due to a locking problem - the user is a PA to Head of School with about 9,800 email in INBOX. No other users have the problem or have reported a similar problem. Thanks Stephen Carr Bron Gondwana wrote: On Mon, Nov 29, 2010 at 10:25:46AM +1030, Stephen Carr wrote:Nov 27 14:40:03 brooks reconstruct[9639]: user.USER1.Conny.EHPS.EHPS Council: updating sync_crc 00000000 => 585A4403 Nov 27 14:40:09 brooks sync_client[9652]: MAILBOX received NO response: IMAP_MAILBOX_CRC Checksum Failure Nov 27 14:40:09 brooks sync_client[9652]: CRC failure on sync for user.USER1.Conny.EHPS.Finance Committee, trying full update Nov 27 14:40:09 brooks sync_client[9652]: MAILBOX received NO response: IMAP_MAILBOX_CRC Checksum Failure Nov 27 14:40:09 brooks sync_client[9652]: do_folders(): update failed: user.USER1.Conny.EHPS.Finance Committee 'Mailbox format corruption detected' Nov 27 14:40:09 brooks sync_client[9652]: MAILBOX received NO response: IMAP_MAILBOX_CRC Checksum Failure Nov 27 14:40:09 brooks sync_client[9652]: CRC failure on sync for user.USER1.Conny.EHPS.Finance Committee, trying full update Nov 27 14:40:09 brooks sync_client[9652]: MAILBOX received NO response: IMAP_MAILBOX_CRC Checksum Failure Nov 27 14:40:09 brooks sync_client[9652]: CRC failure on sync for user.USER1.Conny.EHPS.Strawberry Fair, trying full update Nov 27 14:40:10 brooks sync_client[9652]: MAILBOX received NO response: IMAP_MAILBOX_CRC Checksum Failure Nov 27 14:40:10 brooks sync_client[9652]: do_folders(): update failed: user.USER1.Conny.EHPS.Strawberry Fair 'Mailbox format corruption detected' Nov 27 14:40:10 brooks sync_client[9652]: IOERROR: Mailbox format corruption detected Nov 27 14:40:10 brooks sync_client[9652]: Error in do_sync(): bailing out! Mailbox format corruption detected Nov 27 14:40:10 brooks sync_client[9652]: Processing sync log file /common/imap/sync/log-9651 failed: Mailbox format corruption detected Nov 27 14:40:10 brooks sync_client[9651]: process 9652 exited, status 1Can you tell me what the replica was saying in its syslog? It's probably too late to ask you to enable telemetry logging for the replication user so we can see what's going across the wire! Bron. -- Stephen Carr School of Civil, Environmental & Mining Engineering The University of Adelaide Adelaide, South Australia, 5005 Australia Tel +618-8303-4313 Fax +618-8303-4359 Email sgcarr@xxxxxxxxxxxxxxxxxxxxxx CRICOS Provider Number 00123M ----------------------------------------------------------- This email message is intended only for the addressee(s) and contains information that may be confidential and/or copyright. If you are not the intended recipient please notify the sender by reply email and immediately delete this email. 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