I switched back to BDB and it works fine again. I also downgraded to Master-Slave to ensure the good working as suggested.
But my initial question is still unanswered. Yes ? No ?

Le 17/10/2018 à 18:35, Quanah Gibson-Mount a écrit :
--On Wednesday, October 17, 2018 11:32 AM +0200 Florent LARTET <florent.lartet@univ-tlse2.fr> wrote:

 I migrated my OpenLDAP data from bdb to mdb in a Multi-Master
Replication architecture that is working for years now.
 Unfortunately using only 2.4.31-2+deb7u2 from Debian 7.

Don't use MMR with that release.



Quanah Gibson-Mount
Product Architect
Symas Corporation
Packaged, certified, and supported LDAP solutions powered by OpenLDAP: