BPI-P2 Ethernet lights are always burning and no network connectivity

Just last week my BPI-P2 zero with POE adapter had arrive. Installed Debian 9 on it. Now i’m trying to access it through the network but the connectivity seems not to be working. Right after powering up both leds on the ethernet socket are burning and don’t go out. Inserting a cable does not change anything and the lights in the switch it’s connected to won’t light up.

I think it’s not normal the led’s burn without a cable in the first place. Anyone had this problem before?

Kind regards.