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To use Apple Push Notification service (APNs), you need a direct, unproxied connection to the APNs servers on these ports:

  • TCP port 5223 used by the iOS devices server to communicate with APNs.
  • TCP port 2195 used  by the DualShield server to send notifications to APNs.
  • TCP port 2196 for the APNs feedback service.
  • TCP port 443 is required during device activation, and afterwards for fallback (on Wi-Fi only) if devices can't reach APNs on port 5223.

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