Full_Name: Matheus Morais Version: 2.4.42 OS: Red Hat 6 URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (201.77.94.55) In an environment with syncrepl properly configured, if one modification with duplicated attributes values is applied on the "master" node, the "slave" stuck the replication until the entry is removed from cn=accesslog. Here is one LDIF example: dn: ou=marili_advogados,ou=terceiros,cn=sistema,cn=entities,dc=sicredi,dc=com,dc=br changetype: modify - replace: SicrediEntidadePai SicrediEntidadePai: ou=terceiros,cn=sistema,cn=entities,dc=sicredi,dc=com,dc=br - replace: SicrediEntidadePai SicrediEntidadePai: ou=terceiros,cn=sistema,cn=entities,dc=sicredi,dc=com,dc=br This change is processed by master and appears like that on the cn=accesslog: dn: reqStart=20170103135721.000411Z,%3=accesslog objectClass: auditModify reqStart: 20170103135721.000411Z reqEnd: 20170103135721.000413Z reqType: modify reqSession: 1184351 reqAuthzID: cn=manager,dc=br reqControls: {0}{2.16.840.1.113730.3.4.2} reqDN: ou=marili_advogados,ou=terceiros,%n=sistema,cn=entities,dc=sicredi,dc=c om,dc=br reqResult: 0 reqMod: SicrediEntidadePai:= ou=terceiros,cn=sistema,cn=entities,dc=sicredi,dc =com,dc=br reqMod: SicrediEntidadePai:= ou=terceiros,cn=sistema,cn=entities,dc=sicredi,dc =com,dc=br reqMod: entryCSN:= 20170103135721.874447Z#000000#000#000000 reqMod: modifiersName:= cn=manager,dc=br reqMod: modifyTimestamp:= 20170103135721Z reqEntryUUID: 61dfd779-5799-4988-927b-914e75d6ae90 When the slaves try to apply that change, it results in a constraint violation. We can see that kind of message on the slaves logs: 2017-01-03T19:14:21.043501-02:00 ds1openldap5p slapd[2245]: syncrepl_message_to_op: rid=000 mods check (SicrediEntidadePai: multiple values provided) 2017-01-03T19:14:21.043599-02:00 ds1openldap5p slapd[2245]: do_syncrepl% r rid=000 rc 19 retrying 2017-01-03T19:15:21.039822-02:00 ds1openldap5p slapd[2245]: syncrepl_message_to_op: rid=000 mods check (SicrediEntidadePai: multiple values provided) 2017-01-03T19:15:21.039863-02:00 ds1openldap5p slapd[2245]: do_syncrepl: rid=000 rc 19 retrying I think we have two options here: 1 - This kind of LDIF should result in a constraint violation on the master node and the modification is not recorded on cn=accesslog. 2 - The accesslog overlay should remove the duplicated values from attributes. The first option seems more rational IMHO.