FileReference.upload() and proxy problem

Hi all,

I have a problem with the fileReference class and the proxy. The situation is a
Flash movie in which you can select files and upload them to the server via the
fileReference.upload() method. On the server the upload() method calls a
Coldfusion file which handles the upload to the correct folder. Access to the
internet goes throu a proxy. After clicking the button to fire the
fileReference.upload() method, Flash returns a 407 error (proxy authentication
error). This error only shows up on a Mac - Firefox combination! On a Windows -
Firefox combination you get a prompt to fill in your proxy username and
password. Not perfect but the upload works.

Is there a way to solve this problem? A search on the net shows a lot questions
like this, but no answers…

Thanx allready!!

Best regards,
Paul de Snaijer