KB5033375, also known as Windows 11 December 2023 Update, is a mandatory security update that fixes many bugs. But apparently it also causes problems for some. According several reports of Windows Latest, update KB5033375 stops some Wi-Fi connections.
Many readers of the page, especially those working in universities or small and medium-sized businesses, report that after installing KB5033375, they experienced problems with Wi-Fi connections.
For example, a user running Windows 11 22H2 reported experiencing a problem when sending ping requests to Google. Responses were inconsistent, with half of the requests failing to resolve and the other half suffering significant packet loss and delays. After removing the update, the Wi-Fi connection returned to normal.
Another who works as a system administrator at a university identified that the problem could be linked to a compatibility issue between the Qualcomm QCA61x4a wireless adapter and the Windows 11 update.
In some cases, the problem can also affect Wi-Fi connections that use PEAP for connectivity.
A thread on the Microsoft forums suggests that WPA2 Enterprise SSIDs experience Wi-Fi issues when used with 802.11r. Disabling 802.11r seems to restore connectivity, but is not an ideal solution due to potential roaming issues.
The issue seems widespread, with reports from various universities and educational institutions.
