{"id":340669,"date":"2025-05-07T05:05:40","date_gmt":"2025-05-07T12:05:40","guid":{"rendered":"https:\/\/msftnewsnow.com\/?p=340669"},"modified":"2025-05-20T15:32:42","modified_gmt":"2025-05-20T22:32:42","slug":"windows-server-updates-windows-hello-for-business","status":"publish","type":"post","link":"https:\/\/msftnewsnow.com\/windows-server-updates-windows-hello-for-business\/","title":{"rendered":"April 2025 Windows Server Updates Cause Massive Kerberos Authentication Failures Impacting Windows Hello for Business"},"content":{"rendered":"<div class=\"relative\">\n<div class=\"prose text-pretty dark:prose-invert inline leading-normal break-words min-w-0 [word-break:break-word]\">\n<p class=\"my-0\">Microsoft confirmed that the April 2025 security updates are causing <a href=\"https:\/\/answers.microsoft.com\/en-us\/windows\/forum\/all\/windows-hello-facial-recognition-suddenly-stopped\/9abfc99a-38c7-4e6c-a4a6-45490ce3aaa5\" target=\"_blank\" rel=\"noopener\">significant authentication problems<\/a> on several Windows Server versions, including Windows Server 2016, 2019, 2022, and the latest Windows Server 2025. These issues primarily affect enterprise environments using Windows Hello for Business (WHfB) and certificate-based authentication relying on Kerberos protocols<span class=\"whitespace-nowrap\">.<\/span><\/p>\n<h2 class=\"mb-xs mt-5 text-base font-[500] first:mt-0 dark:font-[475]\"><strong>What\u2019s Happening with April 2025 Windows Server Updates?<\/strong><\/h2>\n<p class=\"my-0\"><a href=\"https:\/\/www.bleepingcomputer.com\/news\/microsoft\/microsoft-april-updates-cause-windows-server-auth-issues\/\" target=\"_blank\" rel=\"noopener\">As reported by <em>Bleeping Computer<\/em><\/a>, after installing the April 8, 2025 security update (<a href=\"https:\/\/support.microsoft.com\/en-us\/topic\/april-8-2025-kb5055523-os-build-26100-3775-277a9d11-6ebf-410c-99f7-8c61957461eb\" target=\"_blank\" rel=\"noopener\">KB5055523<\/a>) or subsequent patches, Active Directory Domain Controllers (DCs) may fail to process Kerberos logons or delegations that use certificate-based credentials linked via the Active Directory <a href=\"https:\/\/learn.microsoft.com\/en-us\/openspecs\/windows_protocols\/ms-adts\/f70afbcc-780e-4d91-850c-cfadce5bb15c\" target=\"_blank\" rel=\"noopener\">msds-KeyCredentialLink<\/a> attribute. This impacts environments configured with Windows Hello for Business in Key Trust mode and those <a href=\"https:\/\/learn.microsoft.com\/en-us\/windows\/release-health\/status-windows-server-2025\" target=\"_blank\" rel=\"noopener\">using Device Public Key Authentication (Machine PKINIT)<\/a><span class=\"whitespace-nowrap\">.<\/span><\/p>\n<p class=\"my-0\">The affected authentication protocols include:<\/p>\n<ul class=\"marker:text-textOff list-disc\">\n<li>\n<p class=\"my-0\"><strong>Kerberos Public Key Cryptography for Initial Authentication (Kerberos PKINIT)<\/strong><\/p>\n<\/li>\n<li>\n<p class=\"my-0\"><strong>Certificate-based Service-for-User Delegation (S4U)<\/strong> via Kerberos Constrained Delegation (KCD) and Resource-Based Constrained Delegation (RBKCD)<\/p>\n<\/li>\n<\/ul>\n<p class=\"my-0\">These issues can also disrupt third-party single sign-on (SSO) solutions, smart card authentication, and identity management systems relying on these protocols.<\/p>\n<h2 class=\"mb-xs mt-5 text-base font-[500] first:mt-0 dark:font-[475]\"><strong>Symptoms and Impact<\/strong><\/h2>\n<p class=\"my-0\">Two main symptoms have been identified depending on a specific registry setting (<code>AllowNtAuthPolicyBypass<\/code>) on the domain controllers:<\/p>\n<ul class=\"marker:text-textOff list-disc\">\n<li>\n<p class=\"my-0\"><strong>If set to &#8220;1&#8221;<\/strong>: The DC logs frequent Kerberos event ID 45 warnings about client certificates that do not chain to a root in the NTAuth store. Despite the warnings, logons generally succeed with no user impact.<\/p>\n<\/li>\n<li>\n<p class=\"my-0\"><strong>If set to &#8220;2&#8221;<\/strong>: User logons fail outright, with Kerberos event ID 21 logged, indicating invalid client certificates causing failed smart card logons. This setting leads to authentication failures and user lockouts<span class=\"whitespace-nowrap\">.<\/span><\/p>\n<\/li>\n<\/ul>\n<p class=\"my-0\">The problem is specific to enterprise environments using domain controllers for authentication; home users are unlikely to be affected<span class=\"whitespace-nowrap\">.<\/span><\/p>\n<h2 class=\"mb-xs mt-5 text-base font-[500] first:mt-0 dark:font-[475]\"><strong>Why Did This Happen?<\/strong><\/h2>\n<p class=\"my-0\">The root cause stems from security enhancements introduced in the April 2025 update to address <a href=\"https:\/\/support.microsoft.com\/en-us\/topic\/protections-for-cve-2025-26647-kerberos-authentication-5f5d753b-4023-4dd3-b7b7-c8b104933d53\" target=\"_blank\" rel=\"noopener\">CVE-2025-26647<\/a>, a critical Kerberos authentication vulnerability. The update changed <a href=\"https:\/\/learn.microsoft.com\/en-us\/answers\/questions\/2185050\/server-2025-domain-controllers-trust-relationship\" target=\"_blank\" rel=\"noopener\">how domain controllers validate<\/a> certificates used in Kerberos authentication, enforcing that certificates must chain to a trusted root in the NTAuth store<span class=\"whitespace-nowrap\">.<\/span><\/p>\n<p class=\"my-0\">This stricter validation, while improving security, inadvertently caused compatibility issues with existing certificates and authentication flows in some enterprise setups.<\/p>\n<h2 class=\"mb-xs mt-5 text-base font-[500] first:mt-0 dark:font-[475]\"><strong>Microsoft\u2019s Response and Workarounds<\/strong><\/h2>\n<p><img decoding=\"async\" data-attachment-id=\"340738\" data-permalink=\"https:\/\/msftnewsnow.com\/windows-server-updates-windows-hello-for-business\/a-high-resolution-clean-and-modern-image-featuring-the-official-microsoft-logo-centered-prominently-1\/#main\" data-orig-file=\"https:\/\/e7drz69p964.exactdn.com\/wp-content\/uploads\/2025\/05\/A-high-resolution-clean-and-modern-image-featuring-the-official-Microsoft-logo-centered-prominently-1-scaled.jpeg?strip=all&lossy=1&quality=88&sharp=1&ssl=1\" data-orig-size=\"720,720\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"A high-resolution, clean and modern image featuring the official Microsoft logo centered prominently (1)\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/e7drz69p964.exactdn.com\/wp-content\/uploads\/2025\/05\/A-high-resolution-clean-and-modern-image-featuring-the-official-Microsoft-logo-centered-prominently-1-scaled.jpeg?strip=all&lossy=1&quality=88&sharp=1&ssl=1\" data-large-file=\"https:\/\/e7drz69p964.exactdn.com\/wp-content\/uploads\/2025\/05\/A-high-resolution-clean-and-modern-image-featuring-the-official-Microsoft-logo-centered-prominently-1-scaled.jpeg?strip=all&lossy=1&quality=88&sharp=1&ssl=1\" class=\"alignnone size-full wp-image-340738\" src=\"https:\/\/e7drz69p964.exactdn.com\/wp-content\/uploads\/2025\/05\/A-high-resolution-clean-and-modern-image-featuring-the-official-Microsoft-logo-centered-prominently-1-scaled.jpeg?strip=all&lossy=1&quality=88&sharp=1&ssl=1\" alt=\"April 2025 Windows Server Updates Cause Massive Kerberos Authentication Failures Impacting Windows Hello for Business, Windows Server April 2025 update authentication issues, Kerberos authentication failure Windows Server, Windows Server domain controller Kerberos error, Windows Server Active Directory authentication issues, Windows Server April 2025 patch problems, Windows Server 2016 2019 2022 2025 security update issue, KB5055523 Windows Server update problem, Windows Hello for Business authentication problem, Enterprise Windows Hello for Business logon failure, Certificate-based authentication Windows Server, Windows Server smart card logon failure, Windows Server Kerberos event ID 21 and 45, AllowNtAuthPolicyBypass registry fix, Windows Server authentication workaround, CVE-2025-26647 Kerberos vulnerability\" width=\"720\" height=\"720\" srcset=\"https:\/\/e7drz69p964.exactdn.com\/wp-content\/uploads\/2025\/05\/A-high-resolution-clean-and-modern-image-featuring-the-official-Microsoft-logo-centered-prominently-1-scaled.jpeg?strip=all&amp;lossy=1&amp;quality=88&amp;sharp=1&amp;ssl=1 720w, https:\/\/e7drz69p964.exactdn.com\/wp-content\/uploads\/2025\/05\/A-high-resolution-clean-and-modern-image-featuring-the-official-Microsoft-logo-centered-prominently-1-150x150.jpeg?strip=all&amp;lossy=1&amp;quality=88&amp;sharp=1&amp;ssl=1 150w, https:\/\/e7drz69p964.exactdn.com\/wp-content\/uploads\/2025\/05\/A-high-resolution-clean-and-modern-image-featuring-the-official-Microsoft-logo-centered-prominently-1-scaled.jpeg?strip=all&amp;lossy=1&amp;quality=88&amp;sharp=1&amp;w=288&amp;ssl=1 288w, https:\/\/e7drz69p964.exactdn.com\/wp-content\/uploads\/2025\/05\/A-high-resolution-clean-and-modern-image-featuring-the-official-Microsoft-logo-centered-prominently-1-scaled.jpeg?strip=all&amp;lossy=1&amp;quality=88&amp;sharp=1&amp;w=432&amp;ssl=1 432w, https:\/\/e7drz69p964.exactdn.com\/wp-content\/uploads\/2025\/05\/A-high-resolution-clean-and-modern-image-featuring-the-official-Microsoft-logo-centered-prominently-1-scaled.jpeg?strip=all&amp;lossy=1&amp;quality=88&amp;sharp=1&amp;w=576&amp;ssl=1 576w\" sizes=\"(max-width: 720px) 100vw, 720px\" \/><\/p>\n<p class=\"my-0\">Microsoft acknowledges the issue and is actively working on a fix. Meanwhile, organizations experiencing logon failures can apply a temporary workaround by changing the <code>AllowNtAuthPolicyBypass<\/code> registry value from &#8220;2&#8221; back to &#8220;1&#8221; on affected domain controllers. This adjustment prevents logon failures but may reduce the strictness of certificate validation<span class=\"whitespace-nowrap\">.<\/span><\/p>\n<p class=\"my-0\">Additionally, for issues specifically impacting Windows Hello login on Windows 11 and Server 2025 devices, Microsoft recommends users re-enroll their PIN or facial recognition via the sign-in options in Settings<span class=\"whitespace-nowrap\">.<\/span><\/p>\n<h2 class=\"mb-xs mt-5 text-base font-[500] first:mt-0 dark:font-[475]\"><strong>What Should Enterprises Do Now?<\/strong><\/h2>\n<ol class=\"marker:text-textOff list-decimal\">\n<li>\n<p class=\"my-0\"><strong>Assess Impact:<\/strong> Identify if your environment uses Windows Hello for Business in Key Trust mode or Device Public Key Authentication.<\/p>\n<\/li>\n<li>\n<p class=\"my-0\"><strong>Monitor Event Logs:<\/strong> Look for Kerberos event IDs 21 and 45 on domain controllers to detect potential issues.<\/p>\n<\/li>\n<li>\n<p class=\"my-0\"><strong>Apply Workaround if Needed:<\/strong> Temporarily set <code>AllowNtAuthPolicyBypass<\/code> to &#8220;1&#8221; to avoid logon failures until Microsoft releases a permanent fix.<\/p>\n<\/li>\n<li>\n<p class=\"my-0\"><strong>Stay Updated:<\/strong> Regularly check Microsoft\u2019s <a href=\"https:\/\/learn.microsoft.com\/en-us\/windows\/release-health\/status-windows-server-2025\" target=\"_blank\" rel=\"noopener\">official Windows Server release health page<\/a> for updates and patches addressing this issue<span class=\"whitespace-nowrap\">.<\/span><\/p>\n<\/li>\n<li>\n<p class=\"my-0\"><strong>Plan for Patch Testing:<\/strong> Test future updates in a controlled environment before wide deployment to prevent unexpected authentication disruptions.<\/p>\n<\/li>\n<\/ol>\n<h2 class=\"mb-xs mt-5 text-base font-[500] first:mt-0 dark:font-[475]\"><strong>Why This Matters<\/strong><\/h2>\n<p class=\"my-0\">Kerberos authentication is foundational to secure access in enterprise networks. Disruptions can cause widespread access issues, impacting productivity and security compliance. Windows Hello for Business adoption is growing as organizations seek <a href=\"https:\/\/msftnewsnow.com\/compact-surface-copilot-pc-on-may-6th-passwordless\/\" target=\"_blank\" rel=\"noopener\">passwordless authentication<\/a> solutions, making this issue particularly critical<span class=\"whitespace-nowrap\">.<\/span><\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Microsoft confirmed that the April 2025 security updates are causing significant authentication problems on several Windows Server versions, including Windows Server 2016, 2019, 2022, and the latest Windows Server 2025. These issues primarily affect enterprise environments using Windows Hello for Business (WHfB) and certificate-based authentication relying on Kerberos protocols. What\u2019s Happening with April 2025 Windows &#8230; <a title=\"April 2025 Windows Server Updates Cause Massive Kerberos Authentication Failures Impacting Windows Hello for Business\" class=\"read-more\" href=\"https:\/\/msftnewsnow.com\/windows-server-updates-windows-hello-for-business\/\" aria-label=\"Read more about April 2025 Windows Server Updates Cause Massive Kerberos Authentication Failures Impacting Windows Hello for Business\">Read more<\/a><\/p>\n","protected":false},"author":208461344,"featured_media":340734,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"enabled":false},"version":2}},"categories":[2458,24,2434],"tags":[1348,40,829,761,475,778,1083,1267,1510,275,1213,1317,1228],"class_list":["post-340669","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ai-and-copilot","category-news","category-surface","tag-authentication","tag-azure","tag-copilot","tag-developer","tag-linkedin","tag-microsoft","tag-security","tag-settings","tag-surface","tag-windows","tag-windows-11","tag-windows-hello","tag-windows-server"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/msftnewsnow.com\/wp-content\/uploads\/2025\/05\/A-high-resolution-clean-and-modern-image-featuring-the-official-Microsoft-logo-centered-prominently-scaled.jpeg","jetpack_shortlink":"https:\/\/wp.me\/pfgCZY-1qCF","jetpack-related-posts":[{"id":343486,"url":"https:\/\/msftnewsnow.com\/microsoft-build-2025-ai-agents-windows-11-copilot\/","url_meta":{"origin":340669,"position":0},"title":"Microsoft Build 2025 Recap: Breakthrough AI Agents, Windows 11 Innovations, and Copilot Tuning","author":"Dave W. 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Shanahan","date":"July 1, 2025","format":false,"excerpt":"July 1, 2025, marks a pivotal moment for Microsoft customers and IT professionals. A sweeping wave of changes is transforming the Microsoft product landscape, from core collaboration tools and enterprise infrastructure to cloud services, hardware, and nonprofit licensing. This article provides a detailed, up-to-date overview of every significant update, retirement,\u2026","rel":"","context":"In &quot;Events &amp; Announcements&quot;","block_context":{"text":"Events &amp; Announcements","link":"https:\/\/msftnewsnow.com\/microsoft\/"},"img":{"alt_text":"Microsoft July 1, 2025: New Retirements, Major Changes, and End-of-Support Headaches Loom for Users","src":"https:\/\/i0.wp.com\/msftnewsnow.com\/wp-content\/uploads\/2025\/07\/la1kwnh52vgftxqezf86-scaled.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/msftnewsnow.com\/wp-content\/uploads\/2025\/07\/la1kwnh52vgftxqezf86-scaled.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/msftnewsnow.com\/wp-content\/uploads\/2025\/07\/la1kwnh52vgftxqezf86-scaled.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/msftnewsnow.com\/wp-content\/uploads\/2025\/07\/la1kwnh52vgftxqezf86-scaled.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":12796,"url":"https:\/\/msftnewsnow.com\/windows-server-preview-build-26063-ltsc\/","url_meta":{"origin":340669,"position":5},"title":"Windows Server Preview Build 26063 introduces promising new tools, Feedback Hub","author":"Dave W. Shanahan","date":"February 23, 2024","format":false,"excerpt":"Microsoft has recently announced the release of Windows Server Preview Build 26063, marking a significant step forward in the development of Windows Server 2025.","rel":"","context":"In &quot;News&quot;","block_context":{"text":"News","link":"https:\/\/msftnewsnow.com\/news\/"},"img":{"alt_text":"windows server preview build 26063 windows server 2025","src":"https:\/\/i0.wp.com\/msftnewsnow.com\/wp-content\/uploads\/2024\/02\/ArtemPronichkin_0-1706306634392.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/msftnewsnow.com\/wp-content\/uploads\/2024\/02\/ArtemPronichkin_0-1706306634392.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/msftnewsnow.com\/wp-content\/uploads\/2024\/02\/ArtemPronichkin_0-1706306634392.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/msftnewsnow.com\/wp-content\/uploads\/2024\/02\/ArtemPronichkin_0-1706306634392.png?resize=700%2C400&ssl=1 2x"},"classes":[]}],"jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/msftnewsnow.com\/wp-json\/wp\/v2\/posts\/340669","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/msftnewsnow.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/msftnewsnow.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/msftnewsnow.com\/wp-json\/wp\/v2\/users\/208461344"}],"replies":[{"embeddable":true,"href":"https:\/\/msftnewsnow.com\/wp-json\/wp\/v2\/comments?post=340669"}],"version-history":[{"count":0,"href":"https:\/\/msftnewsnow.com\/wp-json\/wp\/v2\/posts\/340669\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/msftnewsnow.com\/wp-json\/wp\/v2\/media\/340734"}],"wp:attachment":[{"href":"https:\/\/msftnewsnow.com\/wp-json\/wp\/v2\/media?parent=340669"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/msftnewsnow.com\/wp-json\/wp\/v2\/categories?post=340669"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/msftnewsnow.com\/wp-json\/wp\/v2\/tags?post=340669"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}