Microsoft Windows 11 October Update Breaks Localhost (127.0.0.1) Connections

Microsoft’s October 2025 cumulative update for Windows 11 has disrupted localhost functionality, preventing developers and users from accessing local web applications and services via 127.0.0.1. The issue, tied to update KB5066835 released on October 14, affects builds like 26100.6899 and has sparked widespread complaints on forums, including Microsoft’s support pages, Stack Overflow, and Server Fault. […]

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