What to Do If an Intel® NUC’s Local Area Network (LAN) Port...

Summary

Troubleshooting for Intel® NUC's LAN connection problem as evidenced when LAN LED is not blinking.

Description

The NUC's Local Area Network (LAN) port stop working and the LAN LED light is not blinking.
LAN port does not work when the Intel® NUC is restarted. It only becomes active again if the power plug is removed and reconnected.

Resolution

Follow the guidelines below for troubleshooting LAN connection problem.

Step	Details
Basics	Reboot the system Use Windows Network Troubleshooter. Re-seat ethernet cable.
Check BIOS	Check that Ethernet LAN is enabled in BIOS: Press F2 during boot to enter BIOS Setup. Go to Advanced > Devices > Onboard Devices. Check the box to enable LAN. Press F10 to save and exit BIOS. You might see this as Primary LAN and Secondary LAN on some Intel NUC models.
Check LAN cable	Make sure you're using a known good network cable.
Check Ethernet drivers	Install the latest Ethernet LAN drivers available on Download Center for the Intel NUC.
Update BIOS	Install the latest BIOS available on Download Center for the Intel NUC. See BIOS Update Instructions for details.
Cold Reboot	Turn off the Intel® NUC Unplug all the cables and peripherals of the Intel® NUC. Press and hold the power button for 20-30 seconds then release it to discharge remaining power. Clearing the CMOS battery is optional. Reconnect all cables back again and turn on your computer.
Check operating system	Make sure you're using a supported operating system for your Intel NUC.

If the troubleshooting above has been performed and the problem is still not resolved, contact Intel Customer Support.

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