: If you think it's the proxy, get the proxy admin to look at the logs for some of the failed requests, and compare them with a working request. It's possible the proxy's been configured to

If you think it's the proxy, get the proxy admin to look at the logs for some of the failed requests, and compare them with a working request.

It's possible the proxy's been configured to look for certain content and when it finds it, it dumps it.

You mentioned that doing something on the client fixed it though (clearing cache files), so that implies it might not be the proxy directly, but something about the client configuration (possibly in concert with the proxy).

The Fiddler problem you've described sounds like a pure client-side problem. If it's (one user) on (one computer) in (one environment) that has the problem, it's probably just that client. If the client isn't sending the form values when it posts after Proxy authentication, that's basically a client bug - it should send those form values. Running an IE Reset Settings operation might help with that (also, looking at all the add-ins, etc, and trying it in No Addons mode).

Between the proxy logs, the client capture (Fiddler's probably fine for initial troubleshooting, but keep in mind it's not a completely transparent proxy and if Fiddler becomes part of the problem or modifies the request, it's Wireshark/Netmon time) and the target web server, there should be some evidence that something's wrong somewhere.

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