|Microsoft Internet Security and Acceleration Server 2000|
One of the primary functions of ISA Server is to connect your local network to the Internet while protecting your local network from malicious content. To facilitate this connectivity, you use ISA Server to create an access policy that permits internal clients access to specific Internet hosts. The access policy, together with the routing rules, determines how clients access the Internet.
When ISA Server processes an outgoing request, it checks routing rules, site and content rules, and protocol rules to determine if access is allowed. A request is allowed only if both a protocol rule and a site and content rule allow the request and if there is no rule that explicitly denies the request.
Some rules can be configured to apply to specific clients. In this case, the clients can be specified either by Internet protocol (IP) address or by user name. ISA Server processes the requests differently, depending on which type of client requests the object and on how you configure ISA Server.
For an outgoing request, rules are processed in the following order: