(Many brothers have raised the problem that ISAServer2004 cannot be configured accurately in the domain environment, mainly focusing on the inability to cite domain users and the inability to resolve DNS. In this article, I take a domain environment as an example to introduce how to configure ISAServer2004 in a domain environment. From this article, you can learn how to configure the ISA firewall in a domain environment, enable authentication of domain users, configure internal clients, configure DNS forwarding on domain controllers, and set up access rules.)