On the double ethernet port of all of my Blade 3 nodes, the status LEDs (two for each port) remain dark after inserting the plug of a cat 6 cable into one of the ports (and the other one into a switch). The network interface itself does work, so this issue at least not a blocker, but the dead LEDs make debugging the network harder than necessary.
As this problem occurs on all four nodes I’ve got, a broken LED seems not to be the cause. What’s wrong here?