Windows Defender Firewall needs to be properly setup in the JB-199 IV so that the player is protected at all times and yet communicate with the phones and tablets that are connected online.
1. Go to Control Panel (of Windows) > Windows Defender Firewall.
2. Click on "Allow an app or feature through Windows Defender Firewall".
3. Click on "Change Setting".
4. Located the item "Node.js: Server-side JavaScript". If found, check the item and also check both "Private" and "Public". If not found, click on "Allow another app..."
5. Click on "Browse" and select the file C:\\JB-199IV\\esongbook\
ode.exe. Click Open.
8. Click on "Network types...". Check both Private and Public. Click OK.
9. Click Add. Click OK. Close out the Control Panel.
Now you are done setting up the Windows Defender Firewall. The phones and tablets will communicate with the JB-199 IV through the Windows Defender Firewall.