Last Updated: March 2026 | Read Time: 7 min | Tested on: Windows 11 PCs with Realtek LAN adapter
If your Realtek Ethernet is not working in Windows 11, you are not alone. Many users report that their LAN cable is connected, but Windows either shows no internet, does not detect the adapter, or the wired connection stops working after an update.
The good news is that this problem is usually caused by driver issues, power settings, or network configuration errors — not a hardware failure. In most cases, you can fix it in a few minutes.
Why Is Realtek Ethernet Not Working in Windows 11?
From real troubleshooting cases, these are the most common causes:
- Corrupted or outdated Realtek LAN driver
- Windows 11 update broke Ethernet compatibility
- Power saving disabled the adapter
- TCP/IP or DNS settings are corrupted
- Faulty LAN cable or router port
- Ethernet adapter disabled in Device Manager
Quick Overview – 9 Fixes at a Glance
| # | Fix | Difficulty |
|---|---|---|
| 1 | Restart PC and Router | Easy |
| 2 | Check Ethernet Cable and Port | Easy |
| 3 | Enable Realtek Adapter | Easy |
| 4 | Update Realtek Driver | Medium |
| 5 | Reinstall Realtek Driver | Medium |
| 6 | Disable Power Saving | Medium |
| 7 | Reset TCP/IP and Winsock | Medium |
| 8 | Change DNS Server | Easy |
| 9 | Reset Network Settings | Medium |
Fix 1: Restart Your PC and Router
This sounds simple, but it fixes temporary network glitches surprisingly often.
- Turn off your PC completely
- Turn off your router for 2 minutes
- Turn the router back on
- Start your PC and test Ethernet again
If the problem started after a recent update, this should still be your first step.
Fix 2: Check the Ethernet Cable and Router Port
Before changing drivers or settings, rule out a hardware issue.
- Unplug and reconnect the LAN cable firmly
- Try another Ethernet cable if possible
- Switch to a different router LAN port
- Check if the Ethernet LEDs are blinking
Fix 3: Enable the Realtek Ethernet Adapter
Sometimes Windows disables the adapter after an update or power event.
- Press Win + X
- Open Device Manager
- Expand Network adapters
- Right-click Realtek PCIe GbE Family Controller or similar
- Click Enable device if available
If the Realtek adapter is missing completely, also read: Windows 11 Network Adapter Missing – Fix Guide
Fix 4: Update the Realtek Ethernet Driver
An outdated or broken Realtek driver is one of the top reasons Ethernet stops working in Windows 11.
- Open Device Manager
- Expand Network adapters
- Right-click your Realtek Ethernet adapter
- Click Update driver
- Select Search automatically for drivers
If Windows cannot find a better driver, check your PC manufacturer’s website for the latest LAN driver.
Fix 5: Reinstall the Realtek LAN Driver
If updating does not work, reinstalling the driver often fixes corruption.
- Open Device Manager
- Right-click the Realtek Ethernet adapter
- Click Uninstall device
- Restart your PC
Windows usually reinstalls the adapter automatically after reboot.
If your problem started after an update, this guide may also help: Windows 11 Ethernet Not Working After Update
Fix 6: Disable Power Saving for the Adapter
Windows can turn off the Ethernet adapter to save power, which sometimes causes the connection to disappear.
- Open Device Manager
- Right-click the Realtek adapter → Properties
- Go to Power Management
- Uncheck Allow the computer to turn off this device to save power
- Click OK
Fix 7: Reset TCP/IP and Winsock
Corrupted network stack settings can stop Ethernet from working properly.
Open Command Prompt as Administrator and run these commands one by one:
netsh int ip reset netsh winsock reset ipconfig /flushdns ipconfig /release ipconfig /renew
Restart your PC after running the commands.
Fix 8: Change DNS Server
Sometimes Ethernet works, but websites still do not load because of DNS problems.
- Open Settings → Network & Internet
- Click Ethernet
- Find DNS settings and switch to manual
- Use these values:
Preferred DNS: 8.8.8.8 Alternate DNS: 8.8.4.4
If your Ethernet says connected but websites do not open, read: Ethernet Connected But No Internet on Windows 11
Fix 9: Reset Network Settings
If nothing else works, perform a full network reset.
- Go to Settings
- Open Network & Internet
- Click Advanced network settings
- Select Network reset
- Click Reset now
This removes saved network settings and reinstalls your network adapters.
Frequently Asked Questions
Why did my Realtek Ethernet stop working after a Windows 11 update?
Windows updates sometimes install incompatible or broken Realtek LAN drivers. Updating or reinstalling the driver usually fixes the issue.
How do I know if my Realtek Ethernet adapter is faulty?
If the adapter is not detected even after driver reinstall, BIOS check, and cable replacement, it may be a hardware issue.
Can DNS settings stop Realtek Ethernet from working?
Yes. In some cases Ethernet connects physically, but websites do not load due to DNS problems.
Related Windows 11 Network Fixes
- Windows 11 Internet Keeps Disconnecting
- Windows 11 No Internet, Secured
- Windows 11 Internet Problems – Complete Guide
Conclusion
If your Realtek Ethernet is not working in Windows 11, the issue is usually caused by driver conflicts, network stack problems, or simple hardware issues like a faulty cable.
Start with the easy fixes first — cable check, adapter enable, and restart — then move to driver reinstall and network reset if needed.
About the Author: Bharat Choudhary is a tech troubleshooting researcher who specializes in Windows networking issues. All fixes are tested on real Windows devices before publishing.