How to Fix a USB Ethernet Adapter That Is Not Working

Published 2026-10-16 · LuxuriousComputers Repair

You plugged in a USB Ethernet adapter to get a wired network connection on your laptop or computer, but it does not work. Windows does not recognize the adapter — there is no new network connection in the taskbar, Device Manager shows the device with a yellow exclamation mark or does not show it at all, and you have no wired internet. Or the adapter was working before and suddenly stopped — the Ethernet icon disappeared from the taskbar, the adapter shows as disconnected even though the cable is plugged in, or the connection keeps dropping every few minutes. USB Ethernet adapter failures are caused by missing or corrupted drivers, USB power delivery issues, Windows network stack problems, or hardware failure of the adapter or USB port.

Check the basics

• Try a different USB port: Some USB ports do not provide enough power for the Ethernet adapter. USB 3.0 ports (blue interior) provide more power than USB 2.0 ports (black interior). Try both types. Avoid USB hubs — connect the adapter directly to the computer
• Check the cable: Make sure the Ethernet cable is firmly plugged into both the adapter and the router or switch. Try a different Ethernet cable. The link light on the adapter (usually a green or amber LED near the Ethernet port) should be on when the cable is connected to an active network port. If no LED lights up, the cable or the network port on the other end may be the problem
• Try on another computer: Plug the USB Ethernet adapter into a different computer. If it works on the other computer, the issue is with your computer drivers, settings, or USB ports. If it does not work on any computer, the adapter itself is defective

Install or update the driver

Most USB Ethernet adapter problems are driver-related:

Windows automatic driver

• Windows 10 and 11 include built-in drivers for many common USB Ethernet chipsets (Realtek RTL8153, ASIX AX88179, Intel, etc.). When you plug in the adapter, Windows should automatically install the driver. If the automatic installation fails, you see the device in Device Manager with a yellow exclamation mark or as an Unknown Device
• Check Device Manager: right-click Start, Device Manager. Expand Network Adapters and look for your USB Ethernet adapter. If it shows with a warning symbol, right-click it, select Update Driver, then Search Automatically for Drivers. Windows will check for an updated driver

Manufacturer driver

• If the automatic driver does not work, download the driver from the adapter manufacturer website. Common chipset manufacturers: Realtek (for most budget adapters), ASIX (common in Apple and many third-party adapters), and Intel (for business-grade adapters). The adapter packaging or product listing usually states the chipset
• If you do not know the chipset: in Device Manager, right-click the unknown device, select Properties, Details tab, and change the Property dropdown to Hardware Ids. The ID string contains the vendor and product code that you can search online to find the correct driver
• Install the downloaded driver, then restart the computer. The adapter should be recognized after reboot

Reinstall the driver

• If the adapter worked before and stopped: open Device Manager, right-click the Ethernet adapter, select Uninstall Device. Check the box to delete the driver software if available. Unplug the adapter, restart the computer, then plug the adapter back in. Windows will reinstall the driver fresh

Network configuration

• Check if the adapter is disabled: Open Settings, Network and Internet, Advanced Network Settings (or Control Panel, Network and Sharing Center, Change Adapter Settings). Look for the USB Ethernet adapter connection. If it shows as Disabled, right-click and select Enable
• IP configuration: Right-click the network connection, select Properties, double-click Internet Protocol Version 4. Make sure Obtain an IP Address Automatically is selected (unless you need a static IP). If the adapter connects but has no internet, it may not be getting an IP address from DHCP. Release and renew: open Command Prompt, run ipconfig /release then ipconfig /renew
• Network reset: If the adapter is detected but networking does not work: Settings, Network and Internet, Advanced Network Settings, Network Reset. This resets all network adapters and settings to defaults. The computer will restart

USB power and compatibility

• USB power: Gigabit USB Ethernet adapters draw more power than USB 2.0 adapters. If your laptop is on battery saver mode, it may reduce USB power output, causing the adapter to disconnect intermittently. Plug in the laptop charger and test, or disable USB power saving: Device Manager, Universal Serial Bus Controllers, right-click each USB Root Hub, Properties, Power Management, uncheck Allow the Computer to Turn Off This Device to Save Power
• USB selective suspend: Windows can suspend USB devices to save power, causing the Ethernet adapter to drop connection after periods of inactivity. Disable it: Control Panel, Power Options, Change Plan Settings, Change Advanced Power Settings, expand USB Settings, USB Selective Suspend Setting, set to Disabled
• USB 3.0 vs 2.0: Some USB 3.0 Ethernet adapters do not work properly in USB 2.0 ports — they may be detected but limited to 100 Mbps or disconnect frequently. Use a USB 3.0 port for USB 3.0 adapters. Conversely, some older USB 2.0 adapters have compatibility issues with USB 3.0 ports — try a USB 2.0 port if the USB 3.0 port does not work

Windows Update driver conflicts

• Windows Update sometimes installs a generic or incompatible driver that replaces a working manufacturer driver. If the adapter stopped working after a Windows update: Device Manager, right-click the adapter, Properties, Driver tab, Roll Back Driver. This reverts to the previous driver version
• To prevent Windows from overwriting the driver again: after installing the correct manufacturer driver, use the Windows tool to hide the problematic update: download wushowhide.diagcab from Microsoft, run it, and hide the driver update that caused the problem

Hardware failure indicators

• Overheating: Some budget USB Ethernet adapters overheat under sustained high-bandwidth use (large file transfers, streaming). An overheating adapter disconnects to protect itself and reconnects after cooling. If the adapter is hot to the touch when it disconnects, it is overheating. Use it in a well-ventilated location or switch to a higher-quality adapter with better thermal management
• No LEDs: If the adapter shows no LED activity at all when plugged in (not even a brief flash during USB enumeration), the adapter may be dead or the USB port is not providing power. Test with a different port and different computer before concluding the adapter is failed
• Intermittent detection: If the adapter randomly appears and disappears in Device Manager (you hear the USB connect/disconnect sound repeatedly), the USB connector may be loose. Try wiggling the USB plug gently — if the connection drops, the adapter USB connector has a bad solder joint or worn contacts

USB Ethernet adapter setup in Columbus and Delaware

If your USB Ethernet adapter is not working and the troubleshooting above did not resolve it, Luxurious Computers can install the correct drivers, configure the network settings, diagnose whether the issue is the adapter, the USB port, or the computer network stack, and get your wired connection working reliably.