Cannot Get Single Sign On to work in InfoView in BusinessObjects 4.1 SP2

Hi, I have set up a new BusinessObjects 4.1 server and I want to implement single sign on with existing client's Active Directory server. I have followed the guideline at

http://scn.sap.com/blogs/josh_fletcher/2012/06/11/active-directory-sso-for-sap-businessobjects-bi4/

and the result from single sign on in Browser  is not work. The page was loaded but neither sso nor windows authentication popup occurred.

Steps to Reproduce error

1. Install BO server platform 4.1 SP2

2. Follow this step to config single sign on with AD server

3. stderr.log showed **KDC requires pre-authentication** instead of

**Credentials Obtained**

4. Test silent single sign on in Browser and SSO not working

Thank you.