@terziyski, well, the issue just mysteriously resolved itself. I plugged/unplugged the network wires, tried another NAS port, it worked. Then plugged the patchcord back to the first NAS' port and it...

@terziyski, thank you suggestion. > Do you have internet access through the EC220-G5 extended wireless network ? Yes, it works. I had to change 5GHz security to WPA2 (from WPA3) for it to connect. >...

Hello. I added a second router to my home network, model EC220-G5. I configured it in Range Extender Mode and connected it wirelessly to my main router. After it, I connected a NAS to it with a wire....