760WL and Auto Proxy

[John Griffin_3]

Here's the scenario - School network with 760WL access controller, lots of 420 access points, and in the process of purchasing 1500 iPAQ's for the students to use.

The current network uses a web proxy with integrated authentication and basic authentication selected. All PC's have proxy settings set via Group Policy.
The handhelds are a different story, so one of the reasons for the 760 was to remove the need for the user to configure the proxy, and have the 760 use it's "auto proxy redirection" to direct http and https traffic to the upstream proxy.
The problem is that it seems to break the authentication - the 760 seems to proxy the requests itself, but doesn't request the credentials from the client. In the config guides it mentions 4 auto-proxy scenarios, one which appears to be the one we want whereby the clients access the proxy without being proxied through the inbuilt proxy in the 760. However the instructions are vague, and seem to mention the need for the client to configure the proxy manually, which seems strange as you need to configure auto-proxy settings..

Currently the proxy is set in the network settings, and the access policy has the http-proxy enabled and the "allow all" filter seleted.
Also, the pictures in the manual don't match reality as there are options that don't appear on the 760.

Running the latest firmware from the p/w protected download site (4.3.39 or something from memory)

We need to log the username / password on the proxy for legal reasons, so enabling an exception for traffic from the 760 is not a solution.

Is what were are trying to do possible?