The simplest way to achieve this is to make your link look like the following:

http://server/auth/content/file.name instead of http://server/content/file.name

So links to the CMS for which you think you need to make sure user is authenticated and if not, authentication is prompted, just place a "/auth" in front of it.


Without the /auth approach, you can use the help of an Interceptor for the CMSPortlet and perform you check/redirection inside the Interceptor.

Thanks