Microsoft Update Breaks Localhost in Windows 11
Microsoft's October Windows 11 update has caused issues with localhost, preventing developers from accessing web applications on their own machines.
The problem was first reported on Microsoft's support forums and later on Stack Overflow and Server Fault after the October 2025 cumulative update (KB5066835) was released.
- HTTP/2 protocol errors
- Failed connections
These issues affect various applications, including ASP.NET builds and Visual Studio debugging sessions.
Microsoft's quality control department caught napping again
The bug, introduced in build 26100.6899, is related to HTTP.sys, a Windows kernel component that handles local HTTP traffic.
Uninstalling KB5066835, and in some cases KB5065789, has been found to restore localhost functionality.
Author's summary: Microsoft's update breaks localhost in Windows 11, causing issues for developers.
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