Windows XP is not configured to use a local DNS server.
NetBIOS over TCP (NetBT) is disabled on Windows XP, and you are using the NetBT domain name when you try to add the computer.
A third-party firewall program that is installed on the Windows XP-based computer is blocking DNS queries.
The Bdomain.dm is my secondary domain controller. I uninistall the AD from mu secondary Domain controller then i reinistall DNS. Then i install AD in for secondary domain controller and the problem resolved