Xbox 360 WiFi connection issue.

What specifically would allow the Xbox 360 Wireless Networking Adapter to connect while the built-in wifi would not?

My Xbox 360 S detects a wireless signal with 4 bars, and I am testing it while sitting it right next to the modem, so there is no issue with signal strength.

My Xbox 360 S's built-in wifi is able to connect to a hotspot, and it is even able to connect to my neighbor's wifi from my house.

Same problem here. My new xbox 360s connects to my network via internal wifi but it will not connect to xbox live. Everything else in the house connects fine. My xbox even connects when I plug in the old Adapter( from my last xbox) meaning the issue is with
the internal wifi. This is one reason I bought a new xbox slim(internal wifi) this is BS!

Im pretty sure that you cant use the old wifi adaptors with the xbox 360 slim because the internal wifi connection utilizes wifi-N, the newer standard of wireless connections and may not properly interface with the xbox 360 slim.

As for getting a better signal.... i dont think it really makes a difference, most issues regarding that usually are environmental issues surrounding the 360 and nearby access point or the router. For instance having thick walls, microwaves, other computers
running wireless, etc.

Hi,

Xbox 360 E has an integrated Wifi. An adapter won't help you with that issue.

Have you tried to connect it with cable ?

Maybe a console update via cable would help you with the wifi issue.

I have been connected to wifi since I started playing xbox 360.. Never had any issues until most recent update. NONE of my other wifi devices are having this issue so very unlikely it has anything to do with it being on wifi.