How can I use authentication with System.ServiceModel.Syndication to read a private RSS?

The code I use right now just returns forbidden.

I have tried adding &PASS=password and &PASSWORD=password to the URL but it doesnt help.

    try
    {
        using (XmlReader reader = XmlReader.Create("http://trac:8080/Project/report/7?format=rss&USER=enr"))
        {
            tracFeed = SyndicationFeed.Load(reader);
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }