Windows 11 Update Disrupts Localhost Functionality, Users Seek Workarounds
Microsoft's October 2025 Windows 11 update (KB5066835) has caused a critical bug that breaks localhost functionality for developers, traced to HTTP.sys, with workarounds including uninstalling the update or disabling HTTP/2. Microsoft has not yet acknowledged the issue, which seems to be related to system configuration conflicts rather than a universal bug, and the problem is causing widespread frustration among developers.