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@xxxxxxxxx ---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/