How System Notification Queues Work
Your operating system maintains a persistent background connection to notification gateways to save power. When a VPN tunnel reroutes traffic or abruptly drops background TCP connections, the push gateway loses contact with your device, causing alerts from banks and messengers to arrive only when you manually unlock your screen.
How to Restore Instant Push Delivery
- Add Google Play Services or Apple Push Services to your VPN tunnel's exclusion list
- Check if strict background port blocking is enabled in your VPN client settings
- Reset background activity restrictions for your network client in your smartphone settings