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ACP -> Users & Groups -> Groups -> Guest -> Forums and Posts

Uncheck "Can view threads?"

Thank you for your post, Kavin.

I should have been more specific. I meant, i want the threads to be visible for guests and when they click on one, they must register or login to view the content.

try this plug-in : guests can't view threads

Thank you for posting, Ranjani. Unfortunately, it didn't work. :/

But i appreciate all replies.

The above plugin should work.

You may try this one too: http://yaldaram.com/showthread.php?tid=310

Yey, it worked. Thanks, Yaldaram!

And thanks to all.

Just curious, why would you want to do this? You'd be driving off a lot of members.