Could you try disabling "IP Flood Detection" under the services section of your hub and advise if the issue is ongoing?
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I have my xbox connected wired and when I had cable installed I had the same problem so I reset the automatic network settings on the xbox. Once I did that my xbox connecting fine. I would also advise turning off the Ip flooding on the Super Hub
I'm still having issues with my Xbox not connecting. I tried turning off flood detection, and resetting connection settings on my Xbox using "Reset to Factory Default" in the network connections menu, but can still not connect.I am also connecting through a wired connection
When testing the connection, my xbox connects to the network fine (and can stream music from my PC) but fails to connect to the internet, saying that the DNS cannot resolve XBOX Live servers or Xbox.com.
For some strange reason when I go to Systems Settings > Network Settings it says that my XBOX 360 isn't connented to the Superhub even though it blatantly is. So that means i can't even get into Wired Network and reset the Automatic Network Settings to fix this issue. Any ideas?