What could cause the error "Error during Connect (This isn't a valid PLC address, or PLC is busy, or Media is off.)" when trying to connect to the Unity Pro simulator?

FA197950

18/06/2020

One possible explanation for this error is a conflict between Unity and the v6.0 Ethernet MBX driver. Uninstalling the v6.0 Ethernet MBX driver and rebooting the PC will correct the issue.