Impersonation and Delegation with ASP.NET 2.0 on 2 Servers

Hello

I have the following scenario
- SQL 2005 server (serversql)
- Windows 2003 with IIS (serveriis)
- Windows 2003 ADS (serverads)

I want to connect to an intranet application using NTML with impersonation
and delegation. so for this I made the following change in web.config




Then in the Active Directory i did the following change:

Computers\serveriis -> properties -> delegation

- Trust this computer for delegation on these services. Any protocol. And
then I have added the www and w3svc services



But when connecting to the webpage, I always get this error:

Login failed for user 'NT AUTHORITY\ANONYMOUS LOGON'.

any idea what is wrong?

Thanks
Patrick