Ethernet network connection lost after locking or after Screen Saver activation I have configured the Hot Corners as shortcuts for "Put Display to Sleep" and "Start Screen Saver".

Both work as expected, but when the monitor stops, the Ethernet connection is lost and I'm forced to disconnect and reconnect the Ethernet adaptor from the laptop.

How can I solve this frustrating inconvenience?
It seems that you can stop this behavior by preventing your machine from sleeping after screen lock: 


Open System Preferences / Energy Saver
Under Power Adapter, check Prevent computer from sleeping automatically when the display is off


Now my Ethernet connection stays connected!