Microsoft’s October Windows 11 updates caused a critical bug that breaks “localhost” functionality, affecting applications that rely on HTTP/2 connections to 127.0.0.1. Users need to uninstall recent updates to restore local server communication, highlighting issues with Windows updates and local development environments. #Windows11KB5066835 #HTTP2Bug
Keypoints
- The October Windows 11 updates have caused localhost connection failures for many users.
- The bug impacts applications like Visual Studio, SSMS, and Duo Desktop that rely on localhost connections.
- User-reported errors include “ERR_CONNECTION_RESET” and “ERR_HTTP2_PROTOCOL_ERROR”.
- Uninstalling the updates KB5066835 and KB5065789 restores normal localhost functionality.
- Microsoft has not yet confirmed the issue but suggests registry tweaks and updates as potential fixes.