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NTLMv1 SSO enforcement phases

Timelines and exceptions · All guidance changes

Windows · Official Microsoft guidanceObserved changes retained

Observed content change

The page title or its body outside the tracked passages changed. Review the source for its effect.

Read to decideThe wording changed without matching a rule; read the changed passages to decide.

Effect uncertain

Read the current Microsoft source · Link to this observation · Compare any two versions

Observation details · observed 21 Oct 08:12 UTC
Observed by ChangeIntel
21 Oct 08:12 UTC
Source update metadata
21 Oct 02:45 UTC
Source review date
2026-10-20
First observed on this installation
12 Oct 19:19 UTC
Last successful check
25 Oct 22:10 UTC
Next check due
today 04:10 UTC

Observation time is not publication time, and a comparison does not establish an effective date. Full source bodies are not published; this page holds generated summaries, section headings and, as the page's license allows, Microsoft's changed wording. A documentation edit does not confirm feature availability in an environment.

This is an earlier observation; review the latest in My radar.

Timeline

From the capture of 21 Oct 08:12 UTC · an earlier observation
Current window October 2026 this window includes today · Enforced by default
  1. Audit / monitorAugust 2025 Events or warnings only; nothing is blocked
  2. Audit / monitorand later; update release September 2025 Published timing is qualified; effectiveness is not confirmed.
  3. November 2025
  4. Enforced by defaultOctober 2026 Published timing is qualified; effectiveness is not confirmed.
  5. Enforced by defaultafter 13 Oct 2026 Published timing is qualified; effectiveness is not confirmed.
  6. Enforced14 Oct 2026 Now: Enforced; the override no longer helps
  1. 9 months agoyear windowlater in
  2. 14 months agomonth windowlateAudit / monitor
  3. 13 months agomonth windowupdate release · Patch Tuesday 9 Sep 2025Audit / monitor · unconfirmed
  4. 11 months agomonth window
  5. this window includes todaymonth windowupdate release · Patch Tuesday 13 Oct 2026Enforced by default · unconfirmed
  6. 13 days agoafterEnforced by default · unconfirmed
  7. 12 days agoEnforced
  8. 7 days ago

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.

How this timeline changed

Changes between ChangeIntel's readings of the page, between commits of its source file where Microsoft publishes it, in Internet Archive copies of pages that keep no other history, and entries from Microsoft's own change log (dated as Microsoft dates them). Edits between readings that neither records are unknown.

  1. New dated step Introductionseen by ChangeIntel
    after October 13, 2026
  2. No longer on the page Introductionseen by ChangeIntel
    October 2026
  3. Scope added Introductionseen by ChangeIntel
  4. Scope added Referencesseen by ChangeIntel
    October 19, 2026
  5. Exception added Backgroundseen by ChangeIntel
  6. No longer on the page Backgroundseen by ChangeIntel
  7. New dated step Introductionseen by ChangeIntel
    October 2026
  8. Exception added Rollout of changesseen by ChangeIntel
  9. Exception added Temporary security exceptionseen by ChangeIntel
  10. No longer on the page Timelineseen by ChangeIntel
    October 2026
  11. New dated step Backgroundseen by ChangeIntel
    August 2025
  12. New dated step Changesseen by ChangeIntel
    October 2026, October 13, 2026
14 earlier changes
  1. New dated step New registry keyseen by ChangeIntel
    August 2025
  2. New dated step New registry keyseen by ChangeIntel
    October 2026, October 13, 2026
  3. New dated step Referencesseen by ChangeIntel
    October 14, 2026, October 2026
  4. New dated step Rollout of changesseen by ChangeIntel
    October 2026, October 13, 2026
  5. No longer on the page Rollout of changesseen by ChangeIntel
    September 2025 and later
  6. No longer on the page Rollout of changesseen by ChangeIntel
    October 2026
  7. New dated step Rollout of changesseen by ChangeIntel
    later in 2025, September 2025 and later
  8. New dated step Timelineseen by ChangeIntel
    October 2026, October 2026
  9. Recommendation added Preparing for Enforce modeseen by ChangeIntel
  10. Requirement added Restartin New registry keyseen by ChangeIntel
  11. Requirement added Temporary security exceptionseen by ChangeIntel
  12. Scope added Backgroundseen by ChangeIntel
  13. Scope added Frequently asked questions (FAQ)seen by ChangeIntel
  14. Scope added Rollout of changesseen by ChangeIntel
Observed history and review priority

Captured 21 Oct 08:12 UTC; extracted 22 Oct 18:56 UTC. Extractor: microsoft-1/9/d9863eb412f92fa5ec3a8ca32e2dd7cfe8095530f456ecb1866608d1166a435d.

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 · 5

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

Retained observations

  • 23 Oct 09:22 UTC

    Source metadata changed; retained article content is unchanged.

  • 21 Oct 08:12 UTC · shown above
  • 20 Oct 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

    Baseline for retained history; no earlier retained text to compare.

What changed

First observed 18 Oct 2026
  1. 20 Oct 2026 · 07:20:24 UTC References (2)19 Oct 2026
  2. 20 Oct 2026 · 07:20:24 UTC IntroductionOctober 2026 · Enforced by default, conditional → 13 Oct 2026 or later · Enforced by default, conditional
  3. 20 Oct 2026 · 07:20:24 UTC Changes13 Oct 2026 · Enforced by default, conditional → October 2026 · Enforced by default, conditional
  4. 20 Oct 2026 · 07:20:24 UTC 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 · 00:55:08 UTC TimelineAugust 2025 · Audit / monitor, tentative → No longer listed in this observation. Previously: August 2025 · Audit / monitor, tentative
  6. 19 Oct 2026 · 00:55:08 UTC Settings namedBlockNTLMv1SSO, BlockNtlmv1SSO, Credential Guard → BlockNtlmv1SSO, BlockNTLMv1SSO, Credential Guard, MS-CHAPv2, Sign-On, Wi-Fi, EAP-MSCHAPv2, PEAP-MSCHAPv2
  7. 19 Oct 2026 · 00:55:08 UTC References14 Oct 2026 · Enforced
  8. 19 Oct 2026 · 00:55:08 UTC Changes13 Oct 2026 · Enforced by default, conditional
  9. 19 Oct 2026 · 00:55:08 UTC IntroductionOctober 2026 · Enforced by default, conditional
  10. 19 Oct 2026 · 00:55:08 UTC Begin rollout of changes to Windows Server 2025November 2025, tentative → November 2025
  11. 19 Oct 2026 · 00:55:08 UTC Rollout of changes (2)October 2026 · Enforced by default, tentative, conditional → September 2025 or later · Audit / monitor
  12. 19 Oct 2026 · 00:55:08 UTC BackgroundAugust 2025 · Audit / monitor
Show 2 more recent changes
  1. 19 Oct 2026 · 00:55:08 UTCRollout of changes September 2025 or later · Audit / monitor → 2025
  2. 19 Oct 2026 · 00:55:08 UTCSummary 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 26 Oct 02:26 UTC · 270 of 271 readable · 268 fully read · documentation 464/464 current

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