Reset the airport to factory and redo the setup.. once you move to a new network it is most important to start from scratch.. the problems you experience are related to trying to keep the existing setup.. it won't work or works only on ethernet or wireless.. it will simply require you to start afresh.
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How to Fix it When Your iPhone is Not Connecting to Wi-Fi
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Jul 17, 2020 My Internet works fine on my computer but does not work on