I've searched around but haven't really found anything conclusive as to how to fix this.
First, my setup. I have a Linux gateway/server for my network, using a hub, so no hardware router. On the hub are my and my wife's computers, and a WAP. For my Xbox I have the official wireless adapter. The Xbox has a static IP on my network, and has the Xbox Live ports forwarded to it.
Ever since the beginning, if I have it auto sign-in, I get an error saying it can't connect and to test the connection. The same thing happens if I turn off auto sign-in and try to sign in after turning it on. I run the test, test comes out fine (NAT is open and all that), then I'm able to connect with no problems, until I turn of the 360. Next time I turn it on, same thing.
At some point it stopped doing it and I could auto sign-in. Then I red ringed. When I got the replacement, I had to test connection every time again. Any ideas on what could cause this?
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I think it has something to do with the wireless adapter not initializing fully or correctly every time, but running the "test connection" bit initializes it correctly so the connection works as expected.