if your router uses access controls, then don't need wep or wpa keys. you can controll exactly who uses the connection by allowing only certain devices from connection to your router.
set your ps3 to connect, once it starts, check your router's access control to see 1) if your access controll is activated, which would initially block all new connections. and 2) check to see if your ps3 is attempting to connect through the access control list, and choose to allow it.
attempt to connect your ps3 again, and it should now work.
this is just one reason as to why it might not be working, but there are numerous others.
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