SymptomThe network controller stopped working.
Action-
To see if any statuses indicate the source of the issue, check the network controller LEDs.
For LED information, see the network controller documentation or
compute module documentation.
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Be sure that the correct network driver is installed for the controller and that the driver file is not corrupt.
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Be sure that no loose connections exist.
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Be sure that the network cable is working by replacing it with a known functional cable.
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Be sure that the network controller is not damaged.