Hello All, I am running openldap-2.4.30 in multiple locations, and all are replicating from a single Provider.
Upgrade to a current release, to start with. 2.4.30 is ancient, and numerous replication related bugs have been fixed since that release. Second, you may want to configure TCP keepalive settings in the syncrepl setup, as it seems like you have a device between the replicas and master that is timing out the connections. Hard to really know for sure, however.
--Quanah -- Quanah Gibson-Mount Server Architect Zimbra, Inc. -------------------- Zimbra :: the leader in open source messaging and collaboration