httpwebrequest with https behind proxy with authentication

Hi to all,
I have a problem to download a file with httpwebrequest when

_ https protocol is used
_ the client is behind a proxy that requires authentication

For example consider the following code:

WebRequest req = WebRequest.Create("https://www.domus3d.com/ws/test.txt";);
req.Proxy = new WebProxy("http://192.168.0.6:3128";, true); // Proxy available at IP 192.168.0.6 on port 3128
req.Proxy.Credentials = new NetworkCredential("user", "pwd", "domain"); // Proxy network credentials
WebResponse res = req.GetResponse();

I always receive "The remote server returned an error: (407) Proxy Authentication Required.". What's wrong? Note that if I make the request over http the code works and with Internet Explorer I can open the file either over http or over https.

Thanks in advance for any help,
Andrea Pierini

PS: I've seen that many users experience the same problem with WSUS 3.0 behind a proxy with authentication

.

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