An ISA Server client is
a client computer that connects to resources on another network by
going through the ISA Server computer. In most cases, ISA Server clients
are used to provide access to the Internet for users on the Internal
network. The type of client you use on your network depends primarily on
your security requirements and on whether you want to deploy Firewall
Client software to each client computer on your network.
ISA Server supports three types of clients: 1- Firewall clients
Firewall clients are computers on which Firewall Client software has
been installed and enabled. When a computer with the Firewall Client
software installed requests resources on the Internet, the request is
directed to the Firewall service on the ISA Server computer. The
Firewall service authenticates and authorizes the user and filters the
request based on Firewall rules and application filters or other
add-ins. Firewall clients provide the highest level of functionality and
security.
2- SecureNAT clients Secured
clients do not require any client installation or configuration.
SecureNAT clients are configured to route all requests for resources on
other networks to the internal Internet Protocol (IP) address of the ISA
Server computer. If the network includes only a single segment, the
SecureNAT client is configured to use the internal IP address on the
computer running ISA Server as the default gateway. SecureNAT clients
are easiest to configure because only the default gateway on the client computers must be configured.
3- Web Proxy clients
Web Proxy clients are any computers that run Web applications that
comply with Hypertext Transfer Protocol (HTTP) 1.1, such as Web
browsers. Requests from Web Proxy clients are directed to the Firewall
service on the ISA Server computer. Because most client computers
already run Web Proxy–compatible applications, Web Proxy clients do not
require the installation of special software. However, the Web
application must be configured to use the ISAServer computer.
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