Im try to upgrade dns backend to BIND9_DLZ, while running this exception is raised: root@samba-server:~# samba_upgradedns --dns-backend=BIND9_DLZ Reading domain information DNS accounts already exist No zone file /usr/local/samba/private/dns/tavaresesouza.local.zone DNS records will be automatically created Creating DNS partitions Looking up IPv4 addresses Looking up IPv6 addresses Traceback (most recent call last): File "/usr/local/samba/sbin/samba_upgradedns", line 342, in <module> dnsadmins_sid) File "/usr/local/samba/lib/python2.7/site-packages/samba/provision/sambadns.py", line 934, in create_dns_partitions names.configdn, names.serverdn) File "/usr/local/samba/lib/python2.7/site-packages/samba/provision/sambadns.py", line 240, in setup_dns_partitions "SECDESC" : b64encode(descriptor) File "/usr/local/samba/lib/python2.7/site-packages/samba/provision/common.py", line 50, in setup_add_ldif ldb.add_ldif(data, controls) File "/usr/local/samba/lib/python2.7/site-packages/samba/__init__.py", line 224, in add_ldif self.add(msg, controls) _ldb.LdbError: (68, 'Entry DC=DomainDnsZones,DC=tavaresesouza,DC=local already exists')