I need help. Im getting error NW-9735-4 I just got the vita and wit will not connect to wifi. I have looked on google and everyone just says the same old factory reset modem and vita done both. tried statically assiging ip and dns. It can obtain an ip address but in the connection status just says failed next to NAT type. its driving me insane. I have tried 2 rotuers aswell. can anyone help. does anyone have a real solution that isnt a reset. thanks

Maybe you can find an answer here

http://community.us.playstation.com/thread/4670021?start=0&tstart=0

hope it gets solved soon :)

Ive tried 2 different routers. I have one router which is connected through the house to another in the lounge which is plugged into the phoneline. But have tried connecting directly to that one aswell. everyother device works fine. ps3, phone etc. it gets an ip address on the vita and connects but NAT just keeps failing is there a way to change nat type on vita

to change your nat type, this might help.

Try McDonald's Wifi. If that works, it must be some weird setting issue. If it doesn't, go exchange it for a new one.

I bought it of trademe which is our ebay basically. to be honest I think im going to need a new router. what a pain.

Before you buy a new router, find an open public WiFi network and see if you can connect to that to determine whether it's your network and settings, or the Vita.