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Cable Matters 201014 / 201024 Ethernet Stopped Working on macOS after upgrading to 10.13 High Sierra
This article applies to Cable Matters model number 201014 and 201024 to solve the Ethernet issue on macOS 10.13 High Sierra. We noticed that the Ethernet function may be disabled after users upgrade the OS from 10.12 to 10.13. This is caused by the User-Approved Kernel Extension Loading, which should enhance system security, from preventing unknown sources extensions from loading into the kernel.
Unfortunately while wrapped in good intentions, in its current implementation, it may block 3rd-party macOS programs including the driver required by the Cable Matters 201014 and 201024 from working. If you are experiencing this issue, please follow the steps below.
1. Go to System Preferences > Security & Privacy > General
2. Next to the warning message 'system software from developer was blocked from loading', there is a button to allow the driver to load. Click it to enable the driver.
3. Reboot your Mac computer.
If this does not work after rebooting your Mac computer, please reinstall the driver again.