How to show default page in ASP.NET form authentication Web.Apps.

--------- Things I'd like to achieve --------- I set index.html(default.html, etc) as most prevailing default page in ASP.NET Web Application (this operation is done on IIS Manager), and hope to let it show when user set url of the WebApps without page name. I thinkg, if the url of the WebApp is something like 'http://www.somewhere.com/testApps/', when you set it in browser's address bar, index.html would be shown. But if the web application uses form authentication, it does not work. ----------- Circumstances ----------- OS: Windows 7 Pro or Windows Server 2008 IIS Server: IIS 7.5.7600 Web Application/ ASP.NET 4.0, ASP.NET 2.0 ---------------- The way to reproduce the problem ---------------- 1. Make a simple ASP.NE ...