1. Start the menu search "Control Panel". If it is windows 10, directly start the menu and directly enter the content to be searched.
2. Enter the control panel, change the category in the upper right corner to "small icon", find the windows firewall and open it.
3. Enter the firewall status page and click on the left to start or close the firewall: it is used to open the firewall or close the existing firewall.
4. Return to the status page and select Allow programs to pass through the firewall on the left: used to set the network communication function that some programs are blocked by the firewall.
5. Select the application to pass according to the check box.
6. Return to the status page and select Advanced Settings on the left: View more advanced firewall setting rules.
Precautions:
If the LAN can't ping, you can enter the advanced settings and turn on the echo function. Before forwarding a packet, it is filtered according to its destination address, source address and port number.