I searched through old posts about this, and tried following the instructions, but this isn't working for me. What I want is for guests to be able to read the Index Page, but if they click on any forums, I want those to be unviewable.
I've tried both:
guests see forum = yes
guests read forum = no
The best I can explain it is, when I set each category for No Access to Guests, some show up and some don't. Some are just "stacked" on top of each other with no forums showing, while others show the forums, and those can be clicked into and read by guests.
Use the Permission Masks facility to view forum-based permissions for the anonymous user for a forum that is hidden from gusts and one that is not. If you click on the trace icon next to a permission you will see trace of the sources for the permission.