Fix Ethernet Keeps Disconnecting in Windows 11

If your Ethernet connection keeps dropping in Windows 11, the fix usually involves updating or reinstalling the network adapter driver, disabling power saving for the adapter, or changing the duplex speed setting. Start with the driver update and power management checks below, as they resolve the majority of cases.

Why Ethernet Disconnects in Windows 11

Windows 11 introduced stricter power management defaults and a new network stack, which can cause wired connections to drop intermittently. Common triggers include:

• Driver conflicts after a Windows update or a fresh install.
• Power saving features that put the network card to sleep when idle.
• Duplex/speed mismatches with the router or switch.
• Faulty cables or ports that work most of the time but fail under load.
• IPv6 or DNS settings that cause the connection to reset.

Most disconnects are software-related, so you can usually fix them without replacing hardware.

Fix 1: Update or Reinstall the Network Adapter Driver

The most common cause is an outdated or corrupted driver. Windows 11 sometimes installs a generic driver that lacks the latest bug fixes.

1. Press Win + X and select Device Manager.
2. Expand Network adapters, right-click your Ethernet adapter (e.g., Realtek, Intel, Killer), and choose Update driver.
3. Select Search automatically for drivers. If Windows finds nothing, go to the manufacturer’s website and download the latest driver for your exact model.
4. If updating doesn’t help, right-click the adapter and choose Uninstall device. Check Delete the driver software for this device, then restart. Windows will reinstall the driver automatically.

If the problem started after a recent Windows update, you can also roll back the driver: right-click the adapter, go to Properties > Driver > Roll Back Driver.

Fix 2: Disable Power Saving for the Adapter

Windows 11 is aggressive about saving power, and it may put your Ethernet card to sleep even when the PC is active. This causes the connection to drop and then reconnect.

1. Open Device Manager again.
2. Right-click your Ethernet adapter and select Properties.
3. Go to the Power Management tab.
4. Uncheck Allow the computer to turn off this device to save power.
5. Click OK and restart your PC.

Also check the Windows power plan: go to Control Panel > Power Options > Change plan settings > Change advanced power settings. Under PCI Express > Link State Power Management, set it to Off for both battery and plugged in.

Fix 3: Change Duplex Speed and Disable IPv6

Sometimes the adapter negotiates an incorrect speed with your router, causing packet loss and disconnects. Forcing a specific speed often stabilizes the link.

1. In Device Manager, right-click your Ethernet adapter and select Properties.
2. Go to the Advanced tab.
3. Find Speed & Duplex (or Link Speed & Duplex).
4. Change it from Auto Negotiation to 1.0 Gbps Full Duplex (or 100 Mbps if your router is older).
5. Click OK and restart.

If your connection is still unstable, disable IPv6 temporarily: go to Settings > Network & Internet > Advanced network settings > More network adapter options. Right-click your Ethernet adapter, select Properties, uncheck Internet Protocol Version 6 (TCP/IPv6), and click OK.

Fix 4: Reset TCP/IP and Winsock

Corrupted network stack settings can cause random disconnects. Resetting them is safe and often resolves stubborn issues.

1. Open Command Prompt as administrator (search for “cmd”, right-click, and select Run as administrator).
2. Type the following commands, pressing Enter after each:

• netsh int ip reset
• netsh winsock reset
• ipconfig /release
• ipconfig /renew
• ipconfig /flushdns

Restart your PC after running these. This resets your IP address and DNS cache without affecting personal files.

Fix 5: Check Cable, Port, and Router

If software fixes don’t work, the issue may be physical. A damaged cable or a failing port can cause intermittent disconnects that are hard to diagnose.

• Swap the Ethernet cable with a known-good one. Cat5e or Cat6 is recommended for gigabit speeds.
• Try a different port on your router or switch. Ports can fail silently.
• Check the connection indicator lights on the adapter and router. If they flicker or go off during disconnects, it’s likely a physical issue.
• Update your router’s firmware via its admin page. Router bugs can cause Ethernet drops for all connected devices.

Also test the same cable with another device. If the problem follows the cable or port, replace it.

When to Use Windows Network Reset

If none of the above works, Windows 11 has a built-in network reset that reinstalls all network adapters and resets network settings to defaults.

1. Go to Settings > Network & Internet > Advanced network settings.
2. Click Network reset.
3. Click Reset now and confirm. Your PC will restart.

After reset, you’ll need to reconnect to Wi-Fi and re-enter any VPN credentials. This is a last resort because it removes all saved networks and adapters.

Frequently Asked Questions

Why does my Ethernet disconnect but Wi-Fi works?

This usually points to a problem with the Ethernet adapter itself, its driver, or the physical cable/port. Wi-Fi uses a different radio, so it’s unaffected by wired issues. Try the driver and power management fixes first.

Can a faulty Ethernet cable cause disconnects?

Yes. A damaged or low-quality cable can cause intermittent drops, especially at gigabit speeds. Replace it with a known-good Cat5e or Cat6 cable to rule this out.

Does Windows 11 have a known Ethernet bug?

Some Windows 11 updates have caused network issues, but they are usually fixed in subsequent patches. Always keep Windows updated, and check the manufacturer’s driver page for your adapter if problems persist.

Will changing the duplex speed fix disconnects?

Often, yes. Auto-negotiation can sometimes fail, especially with older routers. Forcing a specific speed like 1 Gbps Full Duplex can stabilize the connection, but you must match the router’s capability.

Is it safe to disable IPv6?

Yes, disabling IPv6 is safe for most home users. It won’t affect normal internet browsing, but some sites or apps that require IPv6 may not work. Re-enable it if you notice any issues.

How do I know if it’s a hardware problem?

If the disconnects continue after all software fixes, and the cable and port are fine, the Ethernet adapter may be failing. Try a USB-to-Ethernet adapter to see if the problem goes away – if it does, the built-in port is faulty.

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