{"id":21049,"date":"2025-04-24T08:00:00","date_gmt":"2025-04-24T15:00:00","guid":{"rendered":""},"modified":"2026-02-19T17:01:10","modified_gmt":"2026-02-20T01:01:10","slug":"tired-of-all-the-restarts-get-hotpatching-for-windows-server","status":"publish","type":"post","link":"https:\/\/www.microsoft.com\/en-us\/windows-server\/blog\/2025\/04\/24\/tired-of-all-the-restarts-get-hotpatching-for-windows-server\/","title":{"rendered":"Tired of all the restarts? Get hotpatching for Windows Server"},"content":{"rendered":"\n<p>Hotpatching for Windows Server 2025, made available in preview in 2024, is now generally available as a subscription service as of July, 2025. Hotpatching is one of many key updates&nbsp;in the latest release of Windows Server 2025 in addition to hybrid and multicloud capabilities,&nbsp;aligned&nbsp;with&nbsp;Azure\u2019s&nbsp;adaptive cloud&nbsp;approach.&nbsp;With hotpatching,&nbsp;we are taking what was previously an Azure-only capability and now making it available to Windows Server machines outside of Azure through&nbsp;<a href=\"https:\/\/learn.microsoft.com\/en-us\/azure\/azure-arc\/\" target=\"_blank\" rel=\"noreferrer noopener\">Azure Arc<\/a>.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-16018d1d wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.microsoft.com\/en-us\/windows-server\" style=\"box-shadow:var(--wp--preset--shadow--natural)\">Protect, adapt, and innovate with Windows Server\u2014Try now<\/a><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"how-does-hotpatching-work\">How does hotpatching work?<\/h2>\n\n\n\n<p>Hotpatching is a new way to install updates in <a href=\"https:\/\/www.microsoft.com\/en-us\/evalcenter\/evaluate-windows-server-2025\">Windows Server 2025<\/a> that does not require a reboot after installation, by patching in-memory code of running processes without the need to restart the process, the application, or operating system.<\/p>\n\n\n\n<p>Some of the benefits of hotpatching include the following:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Greater uptime with fewer reboots, instead of rebooting monthly (12 times a year) rebooting is reduced to quarterly (4 times a year).<\/li>\n\n\n\n<li>Faster deployment of updates as the packages are smaller, install faster, and have easier patch orchestration with Azure Update Manager (optional).<\/li>\n\n\n\n<li>Hotpatch packages install without the need to schedule a reboot, so they can happen sooner. This decreases the \u201cwindow of vulnerability\u201d which can result if an administrator might normally delay an update and restart after a Windows security update is released.<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-16018d1d wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/youtu.be\/LS7BS4jsU_o\" target=\"_blank\" rel=\"noreferrer noopener\">Watch a quick introduction of Windows Server 2025 Hotpatching <\/a><\/div>\n<\/div>\n\n\n\n<p>Azure Arc-enabled Hotpatching for Windows Server 2025 is available for a subscription of $1.50 USD per CPU core per month.&nbsp;<\/p>\n\n\n\n<p>With hotpatching, you will still need to restart your Windows Servers about four times yearly for baseline updates, but hotpatching can save&nbsp;significant time and ease the inconvenience of a traditional \u201cpatch Tuesday.\u201d&nbsp;<\/p>\n\n\n\n<p><a href=\"https:\/\/techcommunity.microsoft.com\/blog\/windowsservernewsandbestpractices\/windows-server-hotpatching-is-here\/3174930\" target=\"_blank\" rel=\"noreferrer noopener\">Hotpatching for Windows Server Datacenter: Azure Edition<\/a> has been available for years. In fact, our own <a href=\"https:\/\/www.microsoft.com\/en-us\/windows-server\/blog\/2024\/01\/23\/how-hotpatching-on-windows-server-is-changing-the-game-for-xbox\/?msockid=10624360a22b6b902d98566aa3916a7f\" target=\"_blank\" rel=\"noreferrer noopener\">Xbox team<\/a> has used it to reduce processes that used to take the team weeks down to just a couple of days. With Windows Server 2025, we have been able to deliver these efficiencies to on-premises and non-Azure servers through connection with Azure Arc.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what-are-the-requirements\">What are the requirements?<\/h2>\n\n\n\n<p>To use hotpatching outside of Azure such as, on-premises or in multicloud environments, you must be using Windows Server 2025 Standard or Datacenter, and your server must be connected to Azure Arc. You will also need to subscribe to the Hotpatch service.<\/p>\n\n\n\n<p><strong>Important reminder:<\/strong> If you are currently using Windows Server 2025 and opted in to try the hotpatching service through Azure Arc in preview, <strong>you will need to disenroll if you wish to end your preview and not subscribe to the service<\/strong>. Otherwise, your subscription starts automatically in July 2025.<\/p>\n\n\n\n<p>If you\u2019re running on Azure IaaS, or Azure Local you can still use hotpatching as part of functionality of Windows Server Datacenter: Azure Edition. This feature is included both with Windows Server 2022 Datacenter: Azure Edition and Windows Server 2025 Datacenter: Azure Edition. There are no new requirements in this case, i.e. you don\u2019t need to Arc-enable those machines, and there\u2019s no additional cost for it.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"how-do-i-enable-hotpatching\">How do I enable hotpatching?<\/h2>\n\n\n\n<p>First, if your server is not yet connected to Azure Arc, you can do so by following&nbsp;<a href=\"https:\/\/learn.microsoft.com\/en-us\/azure\/azure-arc\/servers\/onboard-windows-server?toc=%2Fwindows-server%2Fget-started%2Ftoc.json&amp;bc=%2Fwindows-server%2Fbreadcrumbs%2Ftoc.json\" target=\"_blank\" rel=\"noreferrer noopener\">these steps<\/a>.&nbsp;Azure Arc is available at no extra cost and lets you manage physical servers, and virtual machines hosted&nbsp;<em>outside<\/em>&nbsp;of Azure, on your corporate network, or other cloud providers. In addition to hotpatching, there are several paid Azure services you can access through Azure Arc, including Microsoft Defender for Cloud, Azure Monitor, and many others. For full details, refer to&nbsp;<a href=\"https:\/\/learn.microsoft.com\/en-us\/azure\/azure-arc\/servers\/\" target=\"_blank\" rel=\"noreferrer noopener\">this documentation<\/a>.<\/p>\n\n\n\n<p>Once you are connected with Azure Arc, you will sign into the Azure Portal, go to Azure Update Manager, select your Azure Arc-enabled server, and select the hotpatching option as outlined in <a href=\"https:\/\/learn.microsoft.com\/en-us\/azure\/update-manager\/manage-hot-patching-arc-machines?tabs=manage-single%2Chotpatch-scale\" target=\"_blank\" rel=\"noreferrer noopener\">this documentation<\/a>.<\/p>\n\n\n\n<p>You can also manage your subscription to hotpatching through the <a href=\"https:\/\/azure.microsoft.com\/en-us\/get-started\/azure-portal\" target=\"_blank\" rel=\"noreferrer noopener\">Azure Portal<\/a> as well.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what-is-the-difference-between-hotpatches-and-traditional-patches-lcus\">What is the difference between hotpatches and traditional patches\/LCUs?&nbsp;<\/h2>\n\n\n\n<p>At Microsoft we have traditionally shipped patches known as Latest Cumulative Updates (LCU). An LCU can have a few different types of fixes in its payload such as:&nbsp;<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Security fixes&nbsp;<\/li>\n\n\n\n<li>Bug fixes that are not security fixes&nbsp;<\/li>\n\n\n\n<li>New feature payload&nbsp;<\/li>\n<\/ol>\n\n\n\n<p>In contrast, a hotpatch <em>only<\/em><em> includes <\/em><em>s<\/em><em>ecu<\/em><em>rity f<\/em><em>ixes<\/em> which makes the patch smaller and scoped to security only. We still need to deliver on #2 and #3 above, so we synchronize these payloads once a quarter in the Hotpatching schedule.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what-is-the-hotpatching-schedule\">What is the hotpatching schedule?<\/h2>\n\n\n\n<p>The hotpatch service provides up to eight hotpatches in a year. It follows a three-month cycle with the first month as a <em>baseline<\/em> month (monthly cumulative update) followed by two months of hotpatches. During baseline months the machines will need a reboot. The four planned baseline months are January, April, July and October.<\/p>\n\n\n\n<p>On rare occasions, for security reasons we may have to ship a non-hotpatch update during a hotpatch month which will also need a reboot. But the goal will be to provide up to eight hotpatches in a year.\u202f<\/p>\n\n\n\n<p>The Windows Server hotpatching subscription is billed monthly, so your cost will be consistent throughout the year in both hotpatch and non-hotpatch months.&nbsp;<\/p>\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.microsoft.com\/en-us\/windows-server\/blog\/wp-content\/uploads\/2025\/04\/image-1024x572.webp\" alt=\"A screen shot of a schedule\" class=\"wp-image-21183 webp-format\" srcset=\"https:\/\/www.microsoft.com\/en-us\/windows-server\/blog\/wp-content\/uploads\/2025\/04\/image-1024x572.webp 1024w, https:\/\/www.microsoft.com\/en-us\/windows-server\/blog\/wp-content\/uploads\/2025\/04\/image-300x167.webp 300w, https:\/\/www.microsoft.com\/en-us\/windows-server\/blog\/wp-content\/uploads\/2025\/04\/image-768x429.webp 768w, https:\/\/www.microsoft.com\/en-us\/windows-server\/blog\/wp-content\/uploads\/2025\/04\/image-1536x857.webp 1536w, https:\/\/www.microsoft.com\/en-us\/windows-server\/blog\/wp-content\/uploads\/2025\/04\/image.webp 1600w\" data-orig-src=\"https:\/\/www.microsoft.com\/en-us\/windows-server\/blog\/wp-content\/uploads\/2025\/04\/image-1024x572.webp\"><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"where-to-learn-more-about-windows-server\">Where to learn more about Windows Server<\/h2>\n\n\n\n<p>In addition to the documentation above, please check out our blog posts on Tech Community and watch the on-demand videos from the 2025 Windows Server Summit virtual event. We encourage you to try this time-saving feature and start discovering all the time you\u2019ll save!&nbsp;<a id=\"_msocom_7\"><\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"and-don-t-forget\">And don\u2019t forget\u2026<\/h2>\n\n\n\n<p>As you may have heard at Ignite, hotpatching is also available for Windows 11 Enterprise. Learn more about eligibility and hotpatching for&nbsp;<a href=\"https:\/\/techcommunity.microsoft.com\/blog\/windows-itpro-blog\/hotpatch-for-client-comes-to-windows-11-enterprise\/4302717\" target=\"_blank\" rel=\"noreferrer noopener\">Windows clients here<\/a>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<p>*Prices are in US dollars and are subject to change<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hotpatching for Windows Server 2025, made available in preview in 2024, will become generally available as a subscription service on July 1st, 2025.<\/p>\n","protected":false},"author":6220,"featured_media":21054,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"msxcm_post_with_no_image":false,"ep_exclude_from_search":false,"_classifai_error":"","_classifai_text_to_speech_error":"","footnotes":""},"post_tag":[23],"product":[1012],"content-type":[958],"solution":[],"coauthors":[3337,3710],"class_list":["post-21049","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","tag-windows-server","product-azure","content-type-announcements","review-flag-1593580427-982","review-flag-1710328007-107","review-flag-1593580770-929","review-flag-1-1593580431-223","review-flag-1-1710328007-20","review-flag-2-1593580436-936","review-flag-2-1710328007-310","review-flag-3-1593580441-66","review-flag-3-1710328007-736","review-flag-4-1593580446-763","review-flag-4-1710328008-217","review-flag-new-1593580246-692","review-flag-new-1710328005-681","review-flag-usd-1593580800-54"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Tired of all the restarts? 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