If you’re seeing this error there is a problem with how your computer is connecting to your modem. It’s a good idea to check there is a cable running between your computer and the modem. If it’s connected properly you should see a light on the modem indicating this (it could be labeled as Ethernet/LAN or represented as a number). If you don’t see a light on, try power cycling your modem and trying another cable. This error is generally hardware related and should be followed up with the manufacturer of the device
You could also try reinstalling the drivers of your Ethernet card
broadband 
