I have recently set up a new computer with an Ethernet adapter that supports up to 1 Gbps. I have a 600Mbps optical fibre connection with a set of PLCs (TL-WPA4220KIT) to run a wired connection from the router to the computer. Both ends are connected by a Category 7 Ethernet cable.
When I try to change the speed and duplex of the adapter to 1 Gbps, the adapter becomes disabled and says that I do not have any cable plugged in.
To make the Ethernet work again, I need to set the speed and duplex to another option that isn't the 1 Gbps one. The adapter is an Intel Ethernet Connection (7) I219-V. I am using Windows 10 Pro 64-bit.
Does anyone have any idea what the problem might be? I have looked in other posts but nothing has worked for me. Thank you for your help.