Windows 11 26H2: October 2026 update fixes VPN, FSLogix and S2D issues; one extra restart possible
Summary
The October 2026 Windows security update was released on 2026-10-13 for all supported Windows versions. For Windows 11, version 26H2, it fixes several known problems: Always On VPN, a black screen in Azure Virtual Desktop with FSLogix, and tiered Storage Spaces Direct virtual disks. A limited number of devices may need one additional restart during installation because of the Secure Boot certificate update.
Symptoms
Issues fixed by this update:
- Always On VPN connections stuck in a connecting state or failing to reconnect when automatic protocol selection or fallback was configured.
- Windows Explorer failing to start after sign-in in Azure Virtual Desktop and FSLogix environments, resulting in a black screen.
- Some tiered Storage Spaces Direct virtual disks not coming online after certain security updates, affecting clustered workloads.
Note: a limited number of consumer and business devices might experience one additional restart during installation, after a Secure Boot certificate update is applied.
Affected
- Windows 11, version 26H2 (October 2026 security update, release notes at https://support.microsoft.com/help/5127648)
- Includes improvements from KB5124008 (released 2026-09-08)
- Environments using Always On VPN, Azure Virtual Desktop with FSLogix, or tiered Storage Spaces Direct
Workaround
No workaround known.
Fix
Fixed by the October 2026 Windows security update released on 2026-10-13. The update also adds auditing and optional policy controls for ReFS volumes on externally attached storage devices, to help prepare for future security hardening changes.
Recommendation
Install the October 2026 update promptly, first on a pilot group. Check Always On VPN, FSLogix sign-in and Storage Spaces Direct clusters afterwards. Plan for one additional restart on some devices because of the Secure Boot certificate update. Review the new ReFS auditing and policy controls if you use externally attached storage.
Sources
- The October 2026 Windows security update is now available Vendor · support.microsoft.com
- KB5124008 Windows 11 security update (September 2026) Vendor · support.microsoft.com
- Windows Secure Boot certificate expiration and CA updates Vendor · support.microsoft.com
- ReFS overview Vendor · learn.microsoft.com
Compiled from the sources listed and translated with AI (Claude); status and dates come from the vendor. The vendor’s statements are authoritative. Updated 1 Nov 2026, 15:47.
Where the information comes from
We continuously read the vendors’ official sources, community reports and trade media and summarise them in our own words, with a link to the source:
- Microsoft: Windows release health (Windows 10/11, Server 2016 to 2025), Windows message center, known issues of Microsoft 365 Apps (Outlook, Excel, Word, PowerPoint), Edge, Intune, Autopilot, Windows 365 and Entra Connect, Microsoft KB articles with timelines, Exchange and Windows IT Pro blogs, optionally Microsoft 365 service health and message center
- other vendors: Veeam KB, Citrix (known issues), Ubuntu and Debian (regressions), Broadcom (VMware), Fortinet, Cisco, Mozilla, Let’s Encrypt
- community (title, short excerpt and link only, without the names of the authors): Microsoft Q&A, Microsoft Tech Community (discussions), Veeam R&D Forums, Eleven Forum
- targeted web research with AI (Claude), e.g. on the updates of the month – this also finds discussions on Reddit and in forums; such entries are labelled as community reports until the vendor confirms them
- early warning from trade media (title and link only): Born’s Tech and Windows World, BleepingComputer, AskWoody, Windows Latest, Windows Central, gHacks, The Windows Club, Deskmodder, Dr. Windows, WindowsArea, Frankys Web, heise online
Summary and translation with AI (Claude by Anthropic) – without any data of visitors.
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