After Cyrus upgrade 2.3.16 to 2.4.5: Sync_client bailing out

[Martin Schweizer]

Hello

I upgraded both server (master and client). After restart the sync I
get a lot of messages like them (on different mailboxes):

(sync_client)
Jan 26 09:15:01 acsvfbsd06 sync_client[56473]: MAILBOX received NO
response: System I/O error
Jan 26 09:15:01 acsvfbsd06 sync_client[56473]: do_folders(): update
failed: user.mdemonaco.Sent 'The remote Server(s) denied the
operation'
Jan 26 09:15:01 acsvfbsd06 sync_client[56473]: IOERROR: The remote
Server(s) denied the operation
Jan 26 09:15:01 acsvfbsd06 sync_client[56473]: Error in do_sync():
bailing out! The remote Server(s) denied the operation
Jan 26 09:15:01 acsvfbsd06 sync_client[56473]: Processing sync log
file /usr/imap/var/imap/sync/log-56473 failed: The remote Server(s)
denied the operation
Jan 26 09:15:01 acsvfbsd06 sync_client[56473]: Reprocessing sync log
file /usr/imap/var/imap/sync/log-56473

(sync_server)
Jan 26 09:15:14 acsvfbsd04 syncserver[14859]: IOERROR: failed to parse
/usr/imap/var/spool/imap/sync./14859/33c1d7401877b45e7071d86922b79a6361afd25e
Jan 26 09:15:14 acsvfbsd04 syncserver[14859]: Failed to append file
user.mdemonaco.Sent 2

Of course I did a recontruct -r -G on all mailboxes (as user cyrus). I
did it on the sync_client and on the sync_server. Sometimes the
messages comes again, sometimes the same mailbox get the same error
messages etc. So I have no idea what I have to do now. The sync with
the previous version (2.3.16) runs without any problems.

Any hints are welcome.

Regards,
-- 
Martin Schweizer
schweizer.martin at gmail.com