Just two days after Windows 10 reached its end of life, issues with Microsoft's latest Windows 11 October update have begun to surface. Users on Microsoft Support Forums, Stack Overflow, and Server Fault have reported that the localhost functionality in Windows 11 is now broken. This problem is affecting millions of web developers who are unable to run their applications on their own PCs. The update, KB5066835, focuses on security and enhances the September-issued KB5065789 package with additional quality improvements. However, it disrupts the localhost function, a virtual hostname that allows a PC to serve as its own server. This feature is commonly used by local developers to test websites or fully developed web apps. The disruption has significantly impacted developers, including those using Windows 11 on their local servers or workstations for production purposes.

The hard-working bees in the Microsoft hive are yet to confirm the issue, while the community has managed to solve the issue by simply deleting the October KB5066835 package, alongside its September KB5065789 sibling, if the first package uninstall doesn't work. Software engineers have reported connection failures and HTTP/2 protocol issues impacting various development tools, including ASP.NET compilation processes and Visual Studio debugging functionality. Investigation has revealed that the problem originated in build version 26100.6899, with the root cause identified in HTTP.sys—a kernel-level Windows component responsible for managing HTTP traffic on local systems.
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