Am 07.07.2015 um 07:13 schrieb Gordon Messmer: > > Google-fu also turns up a suggestion that the switch doesn't negotiate > properly in some cases, and that the problem can be resolved by > disabling power saving mode on the switch, in its management interface. > There is really a "Power Saving" option which was turned on. I disabled it, but the problem remains. I think the next step for me to do is to check the ethernet cable(s).