I have two web apps: App A is .NET v1.1 and App B is .NET v2.0 and is running in a virtual directory subfolder of App A.

App B is being used to authenticate users. The plan is to share authentication across web apps accoridng to this article:

ms-help://MS.NETFramework.v20.en/dv_aspnetcon/html/99e2f9e8-5b97-4a4d-a4ed-5f93276053b7.htm

In App A i have put some code to decrypt the cookie set by App B in the Application_AuthenticateRequest Method. When I go to decrypt the authentication ticket in App A, I get an error on decrypting the cookie -- the exception message is "Bad Data."

Is it possible that .NET v1.1 cannot decrypt a cookie which has been encrypted by .NET 2.0

This is virtually the same probelm documented here:

http://www.hide-link.com/

My question is WHY can't .NET v1.1 decypt the cookie encrytped by .NET v2.0 Is there an alternate method