kb5091157

About this tag
The tag kb5091157 covers an out-of-band emergency fix released by Microsoft in April 2026 for Windows Server 2025. This update addresses critical issues from that month's Patch Tuesday, including reboot loops on domain controllers, LSASS failures, and installation errors with KB5082063. The fix is especially relevant for administrators managing Active Directory, Privileged Access Management (PAM), and other identity-dependent services. Discussions highlight how security updates can introduce platform-level risks, making this tag a resource for troubleshooting and understanding the impact of this specific servicing regression on enterprise Windows Server environments.

  1. KB5091157 Out-of-Band Fix: Windows Server April 2026 DC Reboot Loop

    Microsoft has moved quickly to contain a serious April 2026 servicing regression affecting Windows Server, releasing out-of-band fixes after the month’s Patch Tuesday updates triggered reboot loops on some domain controllers and blocked authentication services. The emergency response matters...
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    • domain controller kb5091157 lsass reboot loop windows server
    • Replies: 0
    • Forum: Windows News

  2. KB5091157 April 2026 Out-of-Band Fix for Windows Server 2025 Reboot Loops

    Microsoft has moved quickly to contain a nasty April 2026 Windows Server servicing problem, issuing out-of-band fixes that address both repeated restart failures and update-installation errors tied to the month’s Patch Tuesday release. The immediate relief is real for administrators running...
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    • domain controller domain controller stability kb5091157 lsass crashes lsass reboot loop out-of-band hotfix patch tuesday windows server windows server 2025 windows server patching
    • Replies: 2
    • Forum: Windows News