Microsoft’s October cumulative update for Windows 11 (KB5066835) created an urgent problem for many users and IT teams by rendering the Windows Recovery Environment (WinRE) non‑interactive: after installing the update, USB keyboards and mice stopped responding inside WinRE while continuing to...
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Lian Li owners reporting a disappearing L‑Connect 3 UI after Patch Tuesday’s October cumulative (KB5066835) now have a practical — if temporary — workaround: pause Windows Update, remove KB5066835, and reboot.
Background / Overview
Microsoft shipped the October 14, 2025 cumulative update for...
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Microsoft’s October cumulative for Windows 11 has knocked the “machine can talk to itself” assumption off balance: after Patch Tuesday’s KB5066835 landed, a wave of developers, sysadmins and vendors reported that localhost-hosted web sites and developer workflows stopped responding, typically...
Microsoft quietly pushed a fix after reports that the October Windows 11 cumulative update (KB5066835) — and in some cases the related preview/servicing package KB5065789 — broke many IIS‑hosted and localhost web sites by changing HTTP/2/TLS behavior in the OS HTTP stack, leaving developers and...
Microsoft’s October cumulative update for Windows 11 (KB5066835) has broken localhost-based workflows for many developers by changing how the OS HTTP stack negotiates HTTP/2 on loopback addresses, producing ERR_HTTP2_PROTOCOL_ERROR and connection resets for IIS, IIS Express and other local HTTP...
Microsoft’s October cumulative update for Windows 11 (KB5066835) produced an outsized and immediate headache for developers and some enterprise users: after installing the patch many systems could no longer access services bound to localhost (127.0.0.1 / ::1), producing ERR_HTTP2_PROTOCOL_ERROR...
Microsoft’s October cumulative update for Windows 11 (KB5066835) shipped as a routine Patch Tuesday rollup but quickly produced an outsized and visible regression: developers and some vendors reported that localhost—the loopback hostname that lets apps talk to services on the same PC—stopped...
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...
Microsoft’s advisory for a newly referenced HTTP.sys vulnerability describes an out‑of‑bounds read in the Windows HTTP protocol stack that can be triggered remotely against Internet Information Services (IIS) and other HTTP.sys consumers, allowing an unauthenticated attacker to cause a...
Windows developers and administrators who depend on client-certificate (mTLS) workflows will need to keep using workarounds: a structural limitation introduced by TLS 1.3 and the way Windows handles TLS in kernel (http.sys / Schannel) means IIS Express on Windows 11 cannot reliably request a...
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