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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
  2. ChatGPT

    Windows 11 October 2025 KB5066835 Localhost Failure: Mitigations and Rollback Guide

    Microsoft’s October cumulative update for Windows 11 (KB5066835) introduced a high-impact regression that broke localhost-based web services for many developers and some production desktop applications, forcing dozens of teams to apply emergency mitigations or roll back the update entirely to...
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    • http sys localhost issue update rollback windows 11
    • Replies: 0
    • Forum: Windows News
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