Microsoft patch gives domain-joined Windows PCs trust issues

Microsoft's September cavalcade of cockups continued with confirmation that something is amiss with Active Directory domain logins. The issue, which affects Windows 11 versions 24H2, 25H2, and 26H1, was added to Microsoft's ever-lengthening list of known problems on September 16. It stems from changes to Machine Identity Isolation in the September 2026 security update (KB5124008). The problem is that Credential Guard-protected machine accounts might lose their secure channel with an on-premises Active Directory domain. As a result, users might not be able to sign in with valid domain credentials and may see a message complaining about the trust relationship between the device and domain. The update enables Machine Identity Isolation but...

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