Action

If this message is continuous, try to save any work to a local disk.

When a machine is configured as a networked system, it must be plugged into the Ethernet with a twisted pair J45 connector.

If the Ethernet cable is plugged in, find out whether or not the Ethernet hub does a link integrity test. Then become superuser to check and possibly set the machine's NVRAM. If the hub's link integrity test is disabled, set this variable to false.

# eeprom | grep tpe
tpe-link-test?=true
# eeprom 'tpe-link-test?=false'