Must’ve missed your post 
Tried that and it worked, all I was missing was the salt line.
Didn’t work for me, it started to redirect my forum to the signup page.
You’re not alone!
I just upgraded my site to mu1.5.1 and bbpress to the latest release and now cookies wont work. I’ve tried everything, all the ways listed here and on other sites and no luck.
Its probably because wp2.5 changed cookie styles so the old way doesnt work anymore. I know because I tried my old config and it didnt do anything.
That seems like it would be usefull, but I want to restrict access only in 1 forum, not all.
