I just bought the Xbox 360 Wireless adapter today to hook up to Xbox Live. When I run the Xbox Live connection test, the MTU test fails everytime. I called Xbox's support hotline, they told me to call Belkin (I'm hooked up to the Internet with a Belkin Wireless USB Utility which get the wireless network from a Actiontec "Wireless-Ready" Gateway), who couldn't help me with changing the MTU configuration. Belkin then told me to call the Xbox support hotline again, I told them the new information I found out (including the fact about the Actiontec Gateway) and they told me to call Actiontec. I did that and a recording told me to call Qwest (who's my Internet service provider). I called them and asked them how to change the MTU configuration on the Actiontec Gateway but the support technician couldn't help me. I'm now asking you guys, can anyone help me who has had this problem before? Thanks in advance.