Microsoft patch gives domain-joined Windows PCs trust issues
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. REG AD googletag.cmd.push(function() { googletag.display('labrador/thereg/article/desktop/b'); }); The update enables Machine Identity Isolation but does not switch on enforcement directly.
- ▪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 domai
- ▪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.
- ▪REG AD googletag.cmd.push(function() { googletag.display('labrador/thereg/article/desktop/b'); }); The update enables Machine Identity Isolation but does not switch on enforcement directly.
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| Original publisher | The Register |
| Canonical URL | https://www.theregister.com/os-platforms/2026/09/17/microsoft-patch-gives-domain-joined-windows-pcs-trust-issues/5297155 |
| Publication time | Thu, 17 Sep 2026 15:45:00 +0200 |
| Retrieval time | 2026-09-17T13:48:44.211Z |
| Last seen | 2026-09-17T13:48:44.211Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
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| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | Z6mEzWF-SFvl · 1 stories |
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| Publisher visit | Yes — open original |
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| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
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| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
(function() { let windowUrl = window.location.href; windowUrl = windowUrl.substring(windowUrl.indexOf('?') + 1); let messageElement = document.querySelector('.shareableMessage'); if (windowUrl && windowUrl.includes('code') && windowUrl.includes('expires')) { messageElement.style.display = 'block'; } })(); OS PLATFORMS Microsoft patch gives domain-joined Windows PCs trust issues Machine Identity Isolation policies can reject valid credentials unless controllers meet the Server 2025 functional level Richard Speed Richard Speed MICROSOFT ECOSYSTEM REPORTER Published thu 17 Sep 2026 // 14:45 UTC READ MORE AI model watermarking changes agent behavior 45 minutes ago Cisco drops another exploited zero-day, this time a perfect 10 1 hour ago Microsoft AI chief warns Anthropic not to put ideas in…
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