The firewall tab is slow to update. If you want to see if there is network activity go to graphs/apps and make sure it’s set to its shortest interval. Are you still seeing activity? Please confirm.
We use the Windows Firewall API for blocking. With most Norton versions you have the option to use the Windows Firewall or not, in settings.
If you see the My Norton window, next to Device Security, click Open.
In the Norton main window, click Settings.
In the Settings window, click Firewall.
On the General Settings tab, in the Smart Firewall row, move the On/Off switch to Off or On.
If prompted, select the duration until when you want the Firewall feature to be turned off, and click OK.