The only thing I can suggest is what it in this thread. http://www.phpbb.com/community/viewtopic.php?t=522216
I am running all the information you would find in this thread on my website
which you must login to be able to serf through the site and to do other things, I am slowly intragrading it in with other things like "tagbox" shout box. If you are running phpBB3 who knows, this still might work.
What is explained in that thread doesent forward you to the forums, but keep you on the page with the login on it and it says Welcome USER, (USER is what ever name you login with.). Works good, I did runinto a few problems that was creating my database to crash, but it was minor issues that was actually cause by my IP banning system for my website along with my IP tracking. But the way I have it set up now, I can control how much access someone has to my website if they arent logged in. meaning along as your not loged in you dont see any links, except to affiliates and to register.