First off, in an MVC application do not use the %@ OutputCache % directive on a view. Caching should be done at the controller level, not at the view level. Use the OutputCache attribute instead of %@ OutputCache % .
See http://www.asp.net/learn/mvc/tutorial-15-cs.aspx for an example of how to do this.
By definition, you are caching the page and the resulting page will not be modified. So once you cache it with Request. IsAuthenticated == True, then it will continue to display that result and will not be regenerated until the cache expires or your other conditions you have present dictate for it to.
I think what you need, if your caching it, is two different pages: one for authenticated users and one for unauthenticated users.
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