i have this line of code

WindowsIdentity wi2 = new WindowsIdentity("test1");

test1 is in the ActiveDirectory on the DomainController

when running the code I get an IncorrectFunction error

at System.Security.Principal.WindowsIdentity.KerbS4ULogon(String upn)
   at System.Security.Principal.WindowsIdentity..ctor(String sUserPrincipalName, String type)
   at System.Security.Principal.WindowsIdentity..ctor(String sUserPrincipalName)
   at Hisco.Intranet.LoginForm.OnInit(EventArgs e) in F:\Hisco\DCS\WebEventsManager\HiscoDCS\DCS\LoginForm.aspx.cs:line 17
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

I have windows auth for the website and outside users will logon that are not in the network and I need to impersonate them to login on without offering a login form( quietly behind the scenes) with the test account.

I guess what I actually need is the UserTaken pointer. Is there a way to get one without ising the LogOnUser unmanaged call? 

I have a UserPrincipal object also so is there way to get the token from ActiveDirectory somehow?

Any advice would be helpful.

Thanks,

Nick