XF 2.1 Disallow "what's new" for guests

[ehd]

Hi,

how can I disallow the use of

forum/whats-new/posts/

for guests and unregistered users?

For example: forum/find-threads/unanswered is being redirected to the login-page. How can I do that for
forum/whats-new/posts/

?

Or /whats-new in general?

Thanks alot