When trying to connect to Xbox Live, you see an error that resembles the following:
W: 0000-0021
X: 0000-F001
Y: 20A8-4840
Z: 0000-0000
This may mean that there's a problem with your network setup.
To resolve this problem, try the following solutions. If a solution doesn't work, go to the next one.
Solution 1: Clear the system cache
Here's how:
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Solution 2: Reset your Xbox 360 console
Here's how:
Note If you're using an Xbox 360 Wireless Controller, you can turn on the console by using the Guide button on the controller.
Solution 3: Open network ports
To access Xbox Live, several ports need to be open on your network hardware or firewall. For information about which ports must be opened for Xbox Live, see Network ports used by Xbox Live.
If you keep getting the error, contact Xbox Support.
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