Windows Authentication with SSRS ASP.NET ReportViewer and Web Service

[minhhan]

I'm having a few problems using SSRS currently. I have an ASP.NET website that uses Windows Authentication. That works fine and I know the website current user is the currently logged on user.On this site is a webforms ReportViewer. This works fine when I don't set credentials. However looking at the execution log for the reports in SQL Server the Username is listed as DOMAIN\MACHINE.I've tried setting the ReportServerCredentials property to a class like the one below:\[code\][Serializable]public class ReportCredentials : IReportServerCredentials { public bool GetFormsCredentials(out Cookie authCookie, out string userName, out string password, out string authority){ authCookie = null; userName = null; password = null; authority = null; return false;}public WindowsIdentity ImpersonationUser{ get { return (WindowsIdentity)HttpContext.Current.User.Identity; }}public ICredentials NetworkCredentials{ get { return null; }}\[/code\]}However, when this code executes I now get a 401 back from the web service and report service.What's going on? They're both on the same domain. I want to use the current user and not the current machine. If I run the report on the report server it lists under the correct username, just not from my website.