Erreur cyrus/sync_client

Bonjour,

Après avoir restauré un backup de Bluemind nous rencontrons les erreurs suivantes dans les logs:

Jun  8 13:30:55 bluemind cyrus/sync_client[24693]: do_folders(): update failed: 3c4a0e50.internal!user.xxxxx 'The remote Server(s) denied the operation'
Jun  8 13:30:55 bluemind cyrus/sync_client[24693]: IOERROR: do_user_main: The remote Server(s) denied the operation for xxxxx@3c4a0e50.internal to core (XX.XX.XX.XX)
Jun  8 13:30:55 bluemind cyrus/sync_client[24693]: Error in do_sync(): bailing out! The remote Server(s) denied the operation
Jun  8 13:30:55 bluemind cyrus/sync_client[24693]: Processing sync log file /var/lib/cyrus/sync/core/log.3-run.3 failed: The remote Server(s) denied the operation
Jun  8 13:31:10 bluemind cyrus/sync_client[24693]: do_folders(): update failed: 3c4a0e50.internal!user.xxxxx 'The remote Server(s) denied the operation'

D’où cela peut venir ?