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[Samba] Samba dns update failing

Hey Samba!

I'm trying to join a Samba file server to the Samba PDC and although it works well I have some issues regarding the DNS. Whenever I try to run samba_dnsupdate I get the following response.
    samba_dnsupdate --verbose --all-names
    IPs: ['']
    Traceback (most recent call last):
      File "/usr/sbin/samba_dnsupdate", line 523, in <module>
        sub_vars = get_subst_vars(samdb)
      File "/usr/sbin/samba_dnsupdate", line 261, in get_subst_vars
        vars['DNSDOMAIN'] = samdb.domain_dns_name()
      File "/usr/lib/python2.7/dist-packages/samba/samdb.py", line 650, in domain_dns_name
        return domain_dn.canonical_str().split('/')[0]
    AttributeError: 'NoneType' object has no attribute 'canonical_str'

Which in turn references to this part of the samdb.py file:
     def domain_dns_name(self):
            """return the DNS name of the domain root"""
            domain_dn = self.get_default_basedn()
            return domain_dn.canonical_str().split('/')[0]

It seems that there is no value returned but I'm afraid that I myself can not find out why. Can someone point me to the right redirection or explain what is missing?

The smb.conf file for good measure:
      netbios name = ldb-server
      workgroup = LDB-BEHEER
      security = ADS
      realm = ldb-beheer.nl
      encrypt passwords = yes

      idmap config *:backend = tdb
      idmap config *:range = 70001-80000
      idmap config <win domain>:backend = ad
      idmap config <win domain>:schema_mode = rfc2307
      idmap config <win domain>:range = 3000000-4000000

      winbind nss info = rfc2307
      winbind trusted domains only = no
      winbind use default domain = yes
      winbind enum users = yes
      winbind enum groups = yes

      vfs objects = acl_xattr
      map acl inherit = yes
      store dos attributes = yes

Thanks in advance,
Jens Kuipers

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