Hello @tanghonglai
Since, you’re recent to v24.
Have you reviewed Settings to your preference?
Please run Norton LiveUpdate + Restart (not Shut down) machine.
Please run Quick Scan.
Please run one Full Scan.
Please try Smart Scan, again.
Maybe, power cycle router.
Maybe, refresh your Norton install. [here]
fwiw ~
Avast Network Inspector alert: Device is accessible from the internet
https://support.avast.com/en-ph/article/hns-wan-access/#pc