http://weblogs.asp.net/dsevigny/archive/2008/01/04/token-cache-with-asp-net-and-basic-authentication.aspxIf you develop an ASP.NET application that use Basic Authentication , take care to be sure to change the registry on your staging IIS server. What? Yes, If your application use role based security to securing your pages, adding a new security group toenCommunityServer 2007 SP1 (Build: 20510.895)