[@r-a-y Keymaster 16 years, 1 month ago]

@linusf – Read the other solution Travel Junkie posted:
https://buddypress.org/community/groups/how-to-and-troubleshooting/forum/topic/how-to-make-a-private-community/?topic_page=3&num=15#post-44729

This will block everything but the register and activation pages.