Dear all, I did setup Windows 2008 SP2 and promo to AD DC with IP 10.1.1.11and domain name:abc.com.vn, i am using DNS forwarded to DNS ISP. i configured Forward Lookup Zone and Reverse Lookup Zone for Server subnet (10.1.1.0/24) and user subnet 10.17.16.0/24, all server and client put DNS 10.1.1.11 and they can go to internet well, but unfortunately for me, when using nslookup they cannot revolution right way C:\nslookup Server: hcm-dc-001.abc.com.vn Address: 10.1.1.11 >beeline.vn Server: hcm-dc-001.abc.com.vn Address: 10.1.1.11 Non-authoritative answer: Name: wildcard.vnnic.net.vn Address: 203.162.57.28 Aliases: beeline.vn.com.vn I am worried that the name field above shows .com.vn twice which cannot be right as well How to fix this problem, the problem appear all internal domain or external domain Regards, Minh