macOS and 802.1X
For macOS computers it is necessary to turn off 802.1X
for the network adapter if an 802.1X authentication dialog pops up after connecting the network cable.
This example is for El Capitan
Choose the Network
settings in System Preferences
Choose the ethernet adapter on the left (with the
symbol) and click on Advanced...
Uncheck Enable automatic connections
in the 802.1X tab and click on OK