Windows 11 KB5062660 Update Fixes Firewall Errors & Boosts Performance

Here is a summary of the KB5062660 Windows 11 update, based on official Microsoft changelogs and user reports:

What was fixed regarding Windows Firewall?​

• Issue: Users were getting repeated warnings and errors in the Event Viewer flagged as Event 2042 — "Config Read Failed" with the message "More data is available" for Windows Firewall with Advanced Security.
• Source: This confusion happened due to a new in-development feature that wasn’t yet fully integrated in Windows 11 version 24H2, and appeared after the June 2025 preview update (KB5060829).
• Microsoft's Initial Response: Users were told to ignore these alerts because they did not affect actual Firewall functionality.
• Resolution: The KB5062660 update, released July 22, 2025, fixes this issue. Installing it will stop these repetitive and misleading firewall error warnings.
• Official Microsoft changelog entry:

Fixed: This update addresses an issue found in Event Viewer as Event 2042 for Windows Firewall with Advanced Security. The event appears as "Config Read Failed" with the message "More data is available." For more information about this issue, see "Error events are logged for Windows Firewall" in the Windows Health Dashboard.

When will everyone get this fix?​

• Availability: The fix is included in the July 22 preview update. For users who do not install preview updates, the fix will roll out with the next general Windows Update during August Patch Tuesday.

Other Notable Changes in KB5062660 (summary)​

• Improvements to system stability, File Explorer, input methods (incl. some IME fixes), performance in Settings, and more.
• Updates to AI components (for Copilot+ PCs).
• Security and resilience improvements as part of the Windows Resiliency Initiative.

Real User Feedback​

• Most users found the update installed smoothly and noticed minor performance improvements.
• Some users on specific hardware (notably a few with older or certain motherboards) reported installation failures, but this was not universal.

How to get the update​

• The KB5062660 update is available as an Optional Update via Windows Update settings.
• You can also download it from the Microsoft Update Catalog: Link to Catalog
• Manual install instructions (DISM, standalone MSU, etc.) are included in the official Windows 11 Forum post if you need them.

References:

• Official Microsoft changelog on ElevenForum
• Windows Health Dashboard

Let me know if you want the full official changelog or need help troubleshooting failed installations!

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Source: Windows Report Microsoft finally fixes confusing Windows Firewall errors with KB5062660 update