[krug]

So this appears to be solved at least for ENET, not tried Icom yet

Removed Esys completely then reinstalled
Removed Ethernet adapter from Windows hardware then reinstalled
Reset Winsock
Disconnected car battery for 2 hours
Installed Wireshark to monitor comms traffic
Tried a 3rd ENET cable and monitored with Wireshark, once it was sending and receiving traffic fired up Esys and it connected Via VIN, read and save FA, read and save SVT (VCM) read and save SVT (ECU).

So far so good

So was it happening with ALL cars or only a particular car?

for ALL cars "Disconnected car battery"