Ownership and permissions of /dev/tun. In some after-market firmware releases the VPN subsystem does not have read/write access to the TUN device. The system process (and thus the VPN subsystem) runs with used ID system. So, in official releases of Android 4.0 /dev/tun is owned by system and the owner has read/write permissions.
Confirmation dialog. The VPN subsystem requires the user to confirm that she wants to allow FEAT VPN to act as a VPN app. The confirmation dialog that the VPN system brings up is implemented by /system/app/VpnDialogs.apk. At least one Sony device seems to lack this dialog for some reason.
The new beta version is available for download here: Got From Here
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