Take the disk out of the console. Turn the console off. Wait 30 seconds and then turn it back on.
2
Out-of-date system software
From the Wii U Menu, select "System Settings” and using the Left Stick, scroll to the "System Update" icon and press the A Button. Tap "Update" to connect to the Internet and begin the update process.
3
Home Wi-Fi issue
Consider resetting your home Wi-Fi/internet if your console still cannot connect.
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