I also get the same error message (NW-2468-0) and it's pissing me off. I have many routers and hubs but I'm pretty sure the main one is a Time Capsule. I'm about to throw this useless Vita into a river if I can't fix this problem.
Please HELP! I can connect my vita to my network, but when i want to use internet for making a ps network account or downloading new team upgrades i get the error message NW-2468-0. how can i fixe this?