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Microsoft Update Breaks Localhost in Windows 11

The update causes HTTP/2 errors on localhost, disrupting development tools like Visual Studio and authentication apps, with uninstalling patches restoring functionality for many users.

Summary by The Register
Updated: Microsoft's quality control department caught napping again

10 Articles

Microsoft has done it again. Just two days after Windows 10 officially reached its end of support, the latest Windows 11 update has achieved the unthinkable. The October patch (KB5066835) has left out millions of programmers who are now unable to run their projects or debug code locally, as Microsoft has shattered its localhost on Windows 11, unleashing worldwide criticism. Breaking access to “localhost”, the fundamental element that allows deve…

Thought to strengthen the stability of the system, the latest update of Windows 11 ended up disrupting a pillar of local development. How strange.

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The Register broke the news in on Thursday, October 16, 2025.
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