During the setup of a mirror mode cluster, I enabled the syncprov after building the mirror. So maybe I run into ITS#7274: http://www.openldap.org/its/index.cgi/Documentation?id=7274;selectid=7274... delta-syncrepl fails with: 1) ABANDON log messages on provider; 2) matching "delta-sync lost" log messages on consumer. Do I understand correctly: provider needs contextCSN value for SID=0 in order to have delta-syncrepl working? Does the following query confirm the lack of the contextCSN value for SID=0? ldapsearch -ZZ -h ldap.example.org -LLL -x -s base -b dc=example,dc=org contextCSN dn: dc=example,dc=org contextCSN: 20140925113354.230424Z#000000#001#000000 contextCSN: 20140925113307.523494Z#000000#002#000000 If the mirror mode cluster is in production, do I have any hope to setup delta-syncrepl? Thank you, Francesco