Do you have any DNS settings for your internet connection on your 3DS? Try removing the connection and re-adding it, maybe.Yeah, I have the latest version of homebrew and httpwn, maybe I'll try reinstalling them.
Also, whehn exactly do you get the error in the Dream Suite? Is it only when trying to visit a random dream town? Have you trying to visit a town by entering in a code manually? Have you been assigned a dream address with the file you're using?