I am having the same errors as described a : http://www.ldjcs.com.au/2013/01/samba4-replication-problems/ and b : https://lists.samba.org/archive/samba-technical/2013-January/089881.html Unclear if this is a FreeBSD-only bug or not. I am using Samba-4.0.3 from FreeBSD ports, URL uses version: Version 4.1.0pre1-GIT-013139e System is not productive, so I am more than willing to attempt any logging / patches that might help. The global portion of the smb4.conf files are : [global] workgroup = WORKGROUP realm = WORKGROUP.DOMAIN.CCTLD netbios name = HOSTNAME server role = active directory domain controller nsupdate command = /usr/local/sbin/samba_dnsupdate server services = +s3fs +dns +winbind +dnsupdate +kdc +ldap +rpc +kcc dcerpc endpoint servers = +winreg +srvsvc dns forwarder = GATEWAY allow dns updates = true interfaces = LOCAL-IP/24 bind interfaces only = yes