Event ID 7021 and faulty WLAN

Possible incompatibility to Wi-Fi 6E

TL;DR: If you have problems with Wi‑Fi 6E-enabled networks and see Event ID 7021 in your Windows event log, you may want to try downgrading the Wi‑Fi standard by enforcing WPA2.

The symptoms reported by the user were unusual: his relatively recent Lenovo notebook kept losing its connection in a specific Wi‑Fi network after a short time. The notebook worked flawlessly in other networks, and other devices on the affected network did not seem to have any issues. The Event Log showed Event ID 7021 at the times of the disconnects. Online research revealed reports from several users of an incompatibility between certain Intel wireless adapters and Wi‑Fi 6E that can produce these symptoms.

Lacking access to the router and administrative rights on the notebook, the workaround was to configure the client to use WPA2 instead of WPA3 for that network¹ . Because Wi‑Fi 6E requires WPA3, this forced a fallback to an older Wi‑Fi standard, which in this case resulted in a consistently stable connection.

Security note: As of today (31.10.2025), WPA2 is still generally considered acceptable for many environments, but WPA3 provides stronger protections (better resistance to offline dictionary attacks, improved forward secrecy, and enhanced authentication).