Windows 11 Security Update KB5124008 Breaks Always-On VPN Connections

Microsoft’s September 2026 security update KB5124008 is knocking some Windows 11 enterprise clients off Always On VPN after the Patch Tuesday package landed on September 8. Administrators who can reproduce the failure say certificate-based tunnels that worked immediately before the patch stop connecting afterward, then recover as soon as the cumulative update is removed and […]

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