I have a peculiar case to work on. We are using a proprietary product which supports LDAP integration.
However, it can be configured to use only one LDAP service. (most of the products are shipped that way).
Now, our customers want to login to this product with their own authentication authority.
So, the question is, Am I looking at single Sign-on?
We basically need some service which can sync all these authentication services (e.g. Windows Active directory, Tivoli access manager, Redhat Directory Server...and many more) and then integrate with our application.