Hello,
If the network adapter driver is missing, outdated or compatible, it can cause connection problems. After you upgraded to Windows 11, if your internet doesn’t work properly, it’s possible that the current driver was designed for a previous version of Windows. Update the network adapter driver to fix the problem. You can check if there is a yellow mark next to network device name in Device Manager. Under Network adapters, if you see a yellow mark, the network driver has problems.
Best regards
Zunhui