https://support.apple.com/en-us/102266 https://support.apple.com/en-us/102266 TCP port 443 is used during device activation, and afterwards for fallback if d

https://support.apple.com/en-us/102266 https://support.apple.com/en-us/102266 TCP port 443 is used during device activation, and afterwards for fallback if devices can't reach [Apple Push Notification] APNs on port 5223.