The HTTP Redirector's job is to forward all HTTP requests from firewall and SecureNAT clients to the Web Proxy Service. The Web Proxy Service can then retrieve the HTTP requests - either from the Internet or the ISA Server cache - and return those requests to the firewall and SecureNAT clients. In a nutshell, the filter allows firewall and SecureNAT clients to access HTTP data without having to be configured as Web Proxy clients.
Curt Simmons is the Author of 'Microsoft ISA Configuration and Administration '
Curt Simmons is also the Author of 'Microsoft Internet Security and Acceleration Server 2000 Study Guide : Exam 70-227 ( Certification Study Guides)'
The reverse, however, is also true. Let's say that you configure a policy that allows HTTP access for half of your users and denies access to the second half. If the HTTP Redirector is used, authentication information is lost and the users who are denied access will still gain access via the HTTP Redirector.
The first option, which is selected by default, redirects all HTTP requests from firewall and SecureNAT clients to the Web Proxy Service on the local ISA Server computer. You also see a check box option that allows the HTTP Redirector to directly send the HTTP request to the requested Web server if the Web Proxy Service should be unavailable. Depending on your policy configuration, you'll need to decide if you want the HTTP Redirector to bypass the Web Proxy Service and send client requests directly to Internet Web servers when the Web Proxy Service is not available. Objects are not cached in this case.
Curt Simmons, MCSE, MCT, CTT, is a technology author and trainer from Dallas. Visit Curt on the Internet at http://curtsimmons.hypermart.net.