I seem to have lost all communication with my T3-Nano router. Power light is on and beat is about one beat per second and Ethernet light is on but not blinking. But I don’t see it at all in the T-3000 software or in my pc’s device manager. I reinstalled the software and checked for updates. I replaced my cable. It was working a few days back, perhaps I accidentally changed something but I don’t think so.
If you have a USB to RS485 converter you could try connecting over that.
For ethernet connectivity, there’s many posts here with detailed tips.
Make sure the firewall is disabled,
Temporarily disable all aux ethernet adapters like vpns, wifi and so on.
Make sure DHCP is working and there’s no rogue dhcp servers on your network
Standing by to help out more.