Microsoft shares workaround for Windows domain login issues
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Microsoft has published a workaround for a known issue that blocks Windows 11 users from signing in with valid domain credentials after installing the September 2026 security updates.
The problem affects domain-joined systems, where authentication failures occur despite credentials being correct. Microsoft's guidance offers a temporary mitigation while a permanent fix is developed, and the company has acknowledged the issue as known.
Affected users should note:
- The issue appears after applying the September 2026 security updates on Windows 11.
- Login attempts with valid domain credentials can fail.
- Microsoft has provided a temporary workaround rather than a full patch at this time.
Administrators managing domain-joined Windows 11 fleets are advised to review Microsoft's workaround and apply it where appropriate until a permanent resolution is released.
Source: Unknown
Has your organization encountered domain login failures since deploying the September 2026 updates, and are you applying Microsoft's workaround?
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