Sorry to hear you're having trouble with connecting to Xbox Live after setting up your new router. So we can help narrow this down, do you get an error message or anything like that when you try to sign into Xbox Live?
If you're not getting a particular error message or error code, run an Xbox Live Connection Test and run through this guide for
Xbox 360 Connection errors. It should correlate with where the red X shows up for you after the test.Let us know how it goes! :)
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