Microsoft Internet Security and Acceleration Server 2000

Pass-Through Authentication

With pass-through authentication, a client can send credentials directly to an upstream server, without sending credentials to the local ISA Server.

In a simple scenario, the downstream ISA Server does not request credentials at all, while the upstream server requires authentication from the client. The process works as follows:

Note that in this case, Web filters running on the ISA Server will not access the credentials passed by the client to the upstream server.

In another scenario, both the ISA Server and the upstream server require credentials. In this case, the process works as follows: