Unable to connect to the internet using Ethernet

I have a Mac mini as I try to connect via Ethernet cable to a modem Comcast Arris TG862. I was connected via Wifi without problem (with the exception of the slower speeds). I know that the Ethernet ports on the back of the modem seem to work, since I can listen to my TV, etc. In settings > network Ethernet shows as green and connected and gives me an IP address, but as soon as I turn off Wifi no web page doesn't load.
What I am doing wrong? I thought that it would just connect. On the Ethernet port lights, which I think means data transfer. Otherwise, I need to tell Firefox or Chrome to turn to the Ethernet connection?
Thank you!

The default configuration is to have the WiFi over Ethernet in the Service order.

The order must be set such that the (desired) primary service is at the top of the list and the backup service is below.

If you look at the order of service when it is connected to the network, the higher is the provision of access Internet one (or at least, he thinks Yes).

To set the order, click on the menu of the machine and choose the order of Service. Move Ethernet to the top of the list. This should make it primary unless he loses the connection.

However, it must move up Ethernet and provide a connection when you have turned off the WiFi. When you disable WiFi on the Mac, the Ethernet connection move to the top of the list and show a green connection?

Tags: Mac OS & System Software

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