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NTLMv1 SSO enforcement phases

Timelines and exceptions · All guidance changes

Windows · Official Microsoft guidance

No content change seen yet. Watched since 12 Oct 19:19 UTC, last read today 19:44 UTC, next check 21 Oct 01:44 UTC.

Read the Microsoft source · Link to this observation · My radar

Timeline

From the capture of 12 Oct 19:19 UTC · an earlier observation
Current window October 2026 this window includes today · Enforced by default · tentative
  • 4 dates
  • 2 undated sections
  • 4 with conditions
  1. Audit / monitorAugust 2025 Published timing is qualified; effectiveness is not confirmed.
  2. Audit / monitorand later; update release September 2025 Published timing is qualified; effectiveness is not confirmed.
  3. November 2025 Published timing is qualified; effectiveness is not confirmed.
  4. Enforced by defaultOctober 2026 Published timing is qualified; effectiveness is not confirmed.
  1. 13 months agomonth windowlateAudit / monitor · unconfirmed
  2. 12 months agomonth windowupdate release · Patch Tuesday 9 Sep 2025Audit / monitor · unconfirmed
  3. 10 months agomonth window
  4. this window includes todaymonth windowEnforced by default · unconfirmed

Settings and overrides named on this page

Registry values, policies and cmdlets the source mentions, with the dated steps that name them. Read the source for the values to set.

Requirements, exceptions and scope

Extracted automatically from Microsoft's wording. Confirm dates, conditions and whether they apply to you in the source before acting; a month or quarter is a window, not a day.

Observed history and review priority

Captured 12 Oct 19:19 UTC; extracted 16 Oct 16:10 UTC. Extractor: microsoft-1/9/fc65ebeb286710c0a830833db8a7e5de7e266b79981fe9c7c34479be9369ad3c.

Earlier unavailable versions and edits between checks are unknown. A missing statement requires review; it does not mean the policy was cancelled. Recovered historical statements are not original revision snapshots.

Retained observations · 3

Compact evidence remains available after full document bodies expire. Earlier extractions can have different vocabulary or capture limitations.

No related evidence found in this installation's recent collection. This does not establish that no announcement exists.

Retained observations

  • today 07:19 UTC

    3 edited passages (89 words changed). The changed wording mentions dates and deadlines, supported platforms, settings and controls. Review the source to confirm the effect.

  • 19 Oct 00:53 UTC

    26 new passages (about 560 words), 12 edited passages (133 words changed), 3 removed passages (about 70 words). The changed wording mentions dates and deadlines, defaults, prerequisites, mitigations, settings and controls. Review the source to confirm the effect.

  • 12 Oct 19:19 UTC · shown above

What changed

First observed 18 Oct 2026
  1. 20 Oct 2026 References (2)19 Oct 2026
  2. 20 Oct 2026 IntroductionOctober 2026 · Enforced by default, conditional → 13 Oct 2026 or later · Enforced by default, conditional
  3. 20 Oct 2026 Changes13 Oct 2026 · Enforced by default, conditional → October 2026 · Enforced by default, conditional
  4. 20 Oct 2026 SummaryMicrosoft's guidance publishes 7 dates, from 2025 to 14 Oct 2026 (References). → Microsoft's guidance publishes 8 dates, from 2025 to 19 Oct 2026 (References).
  5. 19 Oct 2026 TimelineAugust 2025 · Audit / monitor, tentative → No longer listed in this observation. Previously: August 2025 · Audit / monitor, tentative
  6. 19 Oct 2026 Settings namedBlockNTLMv1SSO, BlockNtlmv1SSO, Credential Guard → BlockNtlmv1SSO, BlockNTLMv1SSO, Credential Guard, MS-CHAPv2, Sign-On, Wi-Fi, EAP-MSCHAPv2, PEAP-MSCHAPv2
  7. 19 Oct 2026 References14 Oct 2026 · Enforced
  8. 19 Oct 2026 Changes13 Oct 2026 · Enforced by default, conditional
  9. 19 Oct 2026 IntroductionOctober 2026 · Enforced by default, conditional
  10. 19 Oct 2026 Begin rollout of changes to Windows Server 2025November 2025, tentative → November 2025
  11. 19 Oct 2026 Rollout of changes (2)October 2026 · Enforced by default, tentative, conditional → September 2025 or later · Audit / monitor
  12. 19 Oct 2026 BackgroundAugust 2025 · Audit / monitor
Show 2 more recent changes
  1. 19 Oct 2026Rollout of changes September 2025 or later · Audit / monitor → 2025
  2. 19 Oct 2026Summary Microsoft's guidance publishes 4 dates, from August 2025 to October 2026 (Rollout of changes). → Microsoft's guidance publishes 7 dates, from 2025 to 14 Oct 2026 (References).

The most recent 100 field changes are listed. Complete recorded revisions are kept separately.

Cite this recorded revision to keep the same title, summary, facts and links when the page changes.

A day selects the latest observation by the end of that UTC day; today's selection can change until midnight. History starts when this installation records it.

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 20 Oct 22:55 UTC · 258 of 260 readable · 256 fully read · documentation 416/439 current

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