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MacOS sometimes leaks traffic after system updates
We have found that you could be leaking traffic on macOS after system updates. To our current knowledge a reboot resolves it. We are currently investigating this and will follow up with more information.
Most traffic will still go inside the VPN tunnel since the routing table specifies that it should. Unfortunately apps are not required to respect the routing table and can send traffic outside the tunnel if they try to. In the meanwhile we will continue to investigate this to be able to provide more information to Apple and to see if there are any workarounds that we can implement in the app.
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