MonitorWare Knowledge Base

The server computer currently has no primary DNS suffix configured. Its DNS name is currently a single label host name. For example, its currently configured name is "host" rather than "host.example.microsoft.com" or another fully qualified name.
While the DNS server has only a single label name, default resource records created for its configured zones use only this single label name when mapping the host name for this DNS server. This can lead to incorrect and failed referrals when clients and other DNS servers use these records to locate this server by name.