Forum can be seen but cannot post unless registered

[colochris]

Hello to all.

I am curious about a problem I am having. I am looking to make my forums unable to be viewed unless a person registers. I found this site:

http://forums.offtopic.com/forumdisplay.php?f=115

Just a popular site, yet you must be registered to view the inside of the threads.

Now what I have done is gone in to the unregistered usergroup and made my forums viewable, and able to view thread content. Yet what happens is instead of making it where a guest clicks on thread title and then taken to a page where they have to register, it allows them in. So I turn off the View thread content and then it makes everything private and you cannot see any titles

Any ideas of what I can do.

Thanks