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    Windows 11 KB5066835 Localhost HTTP/2 Failure: Triage and Mitigations

    The October cumulative updates for Windows 11 produced a high-impact, widely reported regression that broke many localhost-based HTTP/2 connections on upgraded systems — leaving developers unable to debug IIS/IIS Express sites, blocking desktop apps that rely on local loopback services, and...
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    • http2 regression localhost debugging patch management windows 11
    • Replies: 0
    • Forum: Windows News
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    KB5066835 Breaks Local IIS on Windows 11: Mitigations and Rollback Guide

    A wide-ranging October 2025 cumulative update for Windows 11 (KB5066835), and at least one related preview package, has broken many local IIS-hosted sites and developer workflows — causing ERR_CONNECTION_RESET, ERR_HTTP2_PROTOCOL_ERROR and outright failure of localhost-based services for...
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    • http 2 http sys http.sys http/2 http2 http2 regression iis iis express kb 5066835 kb5066835 local iis localhost localhost debugging localhost issue patch management patch tuesday 2025 regression rollback windows 11
    • Replies: 9
    • Forum: Windows News
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