Chula Vista, CA
reply to Bigchief
I had issues awhile back trying to connect my Xbox360 with wireless N adapter (and Xbox360 S) to my older Airport Extreme router. I had to use ethernet, which was no problem since it was a 10-foot run.
I tried again to get wireless connectivity. If I remember correctly, I initially had it connect to the Airport via N on the 5 GHz band. I wound-up having to scale it back to G on 2.4 GHz band, and that worked.
Now that I have a dual-band capable Airport Extreme, my 360 S connects without issues. (Setting: 802.11n only 5 GHz, 802.11b/g)
Also, according to Xbox.com, there is connectivity problems with AT&T Uverse users and Xbox Live.
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I hate to even post this, but, i'm an idiot...
I had to reset the network configuration to default settings on the xbox. Something I completely looked over thinking it was the gateway's fault. After that I had no problems connecting to the gateway or my router's wireless networks. I decided to stick with using my old router and just using the gateway as a modem though, since I had already set it up... *Smacks forehead*