Maybe it is controller. SDN latest is 5.15.24.19 HW controller has 5.15.24.21

Thanks for explanation :) Unfortunetally mine setup wont work... I havent unmamaged nodes too... Do you have ARP Detection turned on in LAN settings?

How you connected those ES switches? Directly to gateway or to some other switch?

You've upgraded hw controller and gateway?

@Flo30 You're right... ES205GP v1.0 does not support ARP Table and somehow couldn't reach an IP addresses via Router. I'am only using it for powering EAPs for now. TP-Link team knows the issue and...

@Flo30 In my case, ARP detection wasn't help :( I have an ER707-M2. Firmware update is avaliable on release candidate to 1.3.0 in early access program