Your router or modem is the device that connects your Ethernet network to the internet and distributes data among your devices. You should check if your router or modem is powered on connected to the internet and working properly. You can do this by looking at the indicator lights on your router or modem and seeing if they are green or blinking. You can also try restarting your router or modem by unplugging it from the power source waiting for a few seconds and plugging it back in.