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Have you ticked the dox in DNS properties on the server role that is listed as "Dynamically update DNS A and PTR records for DHCP client that do not request updated (for example, clients running Windows NT 4.0)? When you sign in to comment, IBM will provide your email, first name and last name to DISQUS.Otherwise the client doesn’t know what zone name to register in.You can also have a different Connection Specific Suffix in addition to the Primary DNS Suffix to register into that zone as well. AD/DNS zone MUST be configured to allow dynamic updates, whether Secure or Secure and Non-Secure.Keep in mind, for the most part it automatically works "out of the box" without much administrative overhead. The machine’s DNS entries in the NIC, must be ONLY configured to use the internal DNS servers that host the zone. Single label name zones are problematic, do not conform to the DNS RFC, and causes excessive internet traffic to the Root Servers when DNS tries to resolve a single label name query, such as querying for computername.domain – in such a query, the domain name is actually treated as a TLD. DHCP Option 006 MUST only be the internal DNS server(s) you want to use, otherwise if using an ISP’s DNS or your router, expect undesired results. The Primary DNS Suffix on the machine MUST match the zone name in DNS. This is default and expected behavior, but if there are any DCs that have any problems, and the client resolved the SOA to that DC, it may not accept the update. The zone in DNS must NOT be a single lable name, such as "DOMAIN" instead of the required minimum of two hierarchal levels such as domain.com, domain.local, domain.me, domain.you, etc.ISC has made a note of the excessive traffic generated by Microsoft DNS servers configured with a single label name in 2004 with Microsoft, which in turn disabled the ability for Microsoft DNS in Windows 2000 SP4 and newer to resolve single label names without a registry band aid.