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Last week, Microsoft’s latest Windows 11 cumulative update had inadvertently broken localhost authentication, preventing countless developers from debugging applications via localhost or 127.0.0.1.
This functionality is essential for developers, who frequently build and test applications within a local environment before deployment. After the update disrupted this capability, many were forced to construct alternate testing setups on separate machines or virtual environments.
Fortunately, Microsoft responded swiftly to the issue. The company has now released an emergency update to resolve the local address access problem affecting Windows 11 versions 24H2 and 25H2.
This urgent patch is being automatically distributed via Windows Update. In essence, the fix simply rolls back the problematic changes, restoring normal localhost connectivity and temporarily resolving the disruption.
Microsoft noted that the update may take up to 48 hours to reach all affected systems. However, developers can expedite the process by restarting their PCs while connected to the internet, which forces the system to fetch the patch immediately. In most cases, a simple reboot will restore full localhost functionality.
If restarting does not resolve the issue, developers can manually edit the system registry to force Windows to use the HTTP/1.1 protocol, as the bug primarily affects HTTP/2 connections. To do so, open PowerShell in Administrator mode and execute the following command to modify the registry:
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