Flash Upload from behind a proxy

Hi,
I am working behind a proxy and some of the flash uploaders
out there require me to authenticate myself on the local proxy
before allowing me to upload files. I have such an uploader which
currently is outside my network. However after it tryes to execute
file.upload(request); it dies silently without a trace of what is
going on. I presume that it fails because it hasn't requested the
proxy auth. How can I show the proxy auth login pop-up. Here's a
sample of my code
Thank you for your help,
Cosmin

Allow the box to bypass the proxy server, at least temporarily and for purposes of testing this.
This bypass test will allow you to determine if this is the proxy connection, or something within the box or the SUS configuration.
Or permanently, following the "if it hurts, don't do it" model.

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