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Yes, a Windows 11 update killed "localhost" support — Microsoft breaks Windows again

Yes, a Windows 11 update killed "localhost" support — Microsoft breaks Windows again
Update: 2025-10-22
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Microsoft’s latest Windows 11 update, KB5066835, has broken localhost support and disrupted development workflows across the platform. The issue, caused by a faulty change to the HTTP.sys networking component prevents local servers and testing environments from running.
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