If the Problem Still Persists
-
Select [System Preferences] from [Apple Menu].
-
Select [Network] from the [Show] menu.
-
Check that [Ethernet] (or [Ethernet 1], [Ethernet 2], [USB Ethernet], [Thunderbolt Ethernet], or other options) is displayed.
-
Select [Ethernet] (or the same option as the above step), and then check that [IP Address], [SUBNET MASK], and [Router] are correct.