This guide is almost exclusively for driver-related issues with the Ethernet card.
Switch to Wi-Fi, if possible.
Force Windows to reinstall the Ethernet driver.

After a reboot, Windows will automatically identify the equipment and load the driver again.
While you’re in rig Manager,double-check the Ethernet rig is enabled.
initiate the built-in data pipe troubleshooter, located here:options>System>Troubleshoot>Other troubleshooters.

SelectRunnext toNetwork Adapterto have Windows attempt to identify and fix the issue.
Reset the Windows 11 online grid options.
Run a driver updater toolto check for Ethernet driver updates.
A driver updater can still work even if you don’t have internet.
Look through the list linked above for one that works offline, and then follow that app’s directions.
Perform a netsh Winsock reset.
Sometimes, the Ethernet driver becomes so outdated it runs into problems only an update can fix.
In other cases, the driver might have become corrupted due to a software conflict or virus.
FAQ
Toupdate drivers in Windows10, launch unit Manager from the Control Panel or use theWIN+Xkeyboard shortcut.
SelectNetwork Adaptersto expand the category > right-snag the driver > and chooseUpdate driver.
Reinstall the web link driver automatically fromDevice Manager >web link Adapters.
Right-hit the adapter > chooseUninstall>reboot your gear.