What should I do if the WiFi wireless network cannot be connected after the installation of Win11 KB5033375? (Attached is the solution)

php editor Banana has recently received a lot of feedback from readers, saying that the WiFi wireless network cannot be connected after the Win11 KB5033375 update. This situation has caused trouble to users and affected the normal network usage experience. In response to this problem, we have compiled some solutions, hoping to help users who encounter this situation solve it smoothly.

We noticed that one of the Win11 22H2 users reported that when sending ping requests to Google after the update, the response was extremely unstable, with half of the requests unable to be parsed and the other half appearing. Severe packet loss and latency. After uninstalling the update, Wi-Fi returned to normal.

A university system administrator pointed out that the problem may be related to the compatibility issue between Qualcomm QCA61x4a wireless network card and the update. The bug appears to affect at least two updates released in December — KB5033375 (a mandatory security update) and KB5032288 (an optional update).

In some cases, Wi-Fi connected using the PEAP protocol has also been affected.

Additionally, a post on the Microsoft forums states that Wi-Fi issues occur frequently when WPA2 Enterprise SSID is used with the 802.11r standard. While disabling 802.11r can restore connectivity, it is not an ideal solution due to potential roaming issues.

The problem appears to be quite widespread, with multiple universities and educational institutions reporting similar situations. The University of New Haven clearly warned in its support document: "The latest Windows update released on December 12 caused some users to be unable to connect to wireless networks. The update version is KB5033375." Brunel University London also confirmed that the update may cause Wi-Fi is unavailable on campus, and students with exams in the near future are advised not to install this update for the time being.

Currently, the most straightforward solution is to disable the 802.11r protocol on the affected SSID. If that doesn't work, you can try uninstalling the update through the settings interface or command prompt.

While Microsoft has not officially acknowledged the issue or provided a fix, sources say the company is investigating the reports.

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