If using Windows 10 see the following post that has additional things to check in Windows 10. Particularly ensure you have configured Windows 10 Network connection to Private not Public.
If the computer is using a WiFi connection, consult your WiFi router’s administration page to ensure the WiFi network isn’t isolated (often called WiFi Isolation) from the rest of the network and that all devices are receiving an IP address within the same subnet (example: 192.168.1.x).
