In Windows 2000 Server and Windows Server 2003, the directory service is named Active Directory.
In Windows Server 2008 and Windows Server 2008 R2, the directory service is named Active Directory Domain Services (AD DS).
In most cases, the VPN client already has a DNS server address assigned to it.
However, that DNS server address does not resolve names on the corporate network because that DNS server is intended to resolve names on the network the VPN client computer is attached to before connecting to the ISA firewall/VPN server, or to resolve only Internet host names.
You can also access it via the “Accessories” selection on the list of programs. Click on “Use the following DNS Server Addresses” radio button and then in the “Preferred DNS Server” check box type in the following- 220.127.116.11 with the Alternate Server being 18.104.22.168 Last click on “Validate Settings Upon Exit” check box and click Ok.