I am trying to implement single sign on for users within our domain and if the are not then they get re-directed to the login screen to use forms authentication.

I have followed this tutorial below

however I get two issues firstly if I go to my forms authentication page no css or images now display and if i try to login i get an error.

If I go to the login page which should recognise me from the AD I get 401 - Unauthorized: Access is denied due to invalid credentials.
You do not have permission to view this directory or page using the credentials that you supplied.

http://mvolo.com/blogs/serverside/ar...ntication.aspx