Duet no longer connecting

Just fired up my workbee with duet for the first time a few months and cannot connect to the controller software.

Its got ethernet, the link light comes up but I cannot ping it

I have checked with a USB cable and M552 shows the the expected IP address, I can see the firmware booting logs including the message saying the HTTP server is active.

Checked with wireshark and not traffic seen from the network event with a direct cable.

Set a new IP address and all that seems to work as expected but still not connection to the IP address.

Any ideas?

david