Download the Entrust CA (2048) file (entrust_2048_ca.cer)
https://entrust.com/root-certificates/entrust_2048_ca.cer
Apple said: "To ensure you can continue to validate your server's connection to the Apple Push Notification service, you will need to update your push notification server with a copy of the 2048-bit root certificate from Entrust's website".
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Drag & Drop the CER File Here