@Akira_Hayakawa_Atsurae Thank you. It solved my problem.
Jenson_Finn
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But the NE will not work anymore.
Thank you for explaining.
I'm developing my VPN app currently. I can hardly debug my application now.
Condition: I connect my phone\iPad with cable to my computer
When I clicked debug run, everything worked well. After I clicked the connect button in my application, the VPN tunnel connected. Then I lost connection to my device. The debug was interrupted by this. And this will 100% happen.
So I feel the devices were not connected to the computer by cable. This is why I ask this question.