{"id":181938,"date":"2025-10-20T08:17:17","date_gmt":"2025-10-20T12:17:17","guid":{"rendered":"https:\/\/pureinfotech.com\/?p=181938"},"modified":"2025-10-20T08:41:51","modified_gmt":"2025-10-20T12:41:51","slug":"fix-localhost-after-kb5066835-windows-11","status":"publish","type":"post","link":"https:\/\/pureinfotech.com\/fix-localhost-after-kb5066835-windows-11\/","title":{"rendered":"How to fix LocalHost issue after installing update KB5066835 on Windows 11"},"content":{"rendered":"<ul class=\"sum\">\n<li>October 2025 Security Update for Windows 11 25H2 and 24H2 breaks LocalHost connection.<\/li>\n<li>Microsoft has already resolved this issue with a Known Issue Rollback (KIR) release.<\/li>\n<li>However, you can also fix this issue manually by editing the Registry.<\/li>\n<\/ul>\n<p>Microsoft has <a href=\"https:\/\/pureinfotech.com\/windows-11-25h2-known-issues\/\">confirmed<\/a> an issue after installing the <a href=\"https:\/\/pureinfotech.com\/kb5066835-windows-11-october-2025-update\/\">Windows 11 October 2025 Security Update (KB5066835)<\/a> on <a href=\"https:\/\/pureinfotech.com\/windows-11-25h2-vs-24h2\/\">versions 25H2 and 24H2<\/a> that prevents websites from loading using the LocalHost (127.0.0.1) HTTP\/2 connection.<\/p>\n<p>LocalHost is a reserved hostname that refers to your own computer. It acts as an internal loopback address, specifically the IP address 127.0.0.1 (for IPv4). When you send a network request to LocalHost, the data is redirected back to your machine by the operating system, bypassing your network card and the internet.<\/p>\n<p>According to <a href=\"https:\/\/learn.microsoft.com\/en-us\/windows\/release-health\/status-windows-11-25h2#3592msgdesc\" target=\"_blank\" rel=\"noopener\">Microsoft&#8217;s information<\/a>, after installing builds 26100.6899 and 26200.6899, <strong>&#8220;server-side applications that rely on HTTP.sys may experience issues with incoming connections. As a result, IIS websites might fail to load, displaying a message such as &#8220;Connection reset &#8211; error (ERR_CONNECTION_RESET)&#8221;, or similar error. This includes websites hosted on <code>http:\/\/localhost\/<\/code>, and other IIS connections.&#8221;<\/strong><\/p>\n<p>The company also notes that due to a <strong>&#8220;variety of conditions&#8221;<\/strong> that can influence this problem, this particular issue is not happening on every device.<\/p>\n<p>If you&#8217;re experiencing this issue, the company is rolling out a Known Issue Rollback (KIR) package that allows you to undo a specific problematic change introduced by a recent update without requiring you to uninstall the entire update. If this doesn&#8217;t resolve the problem, you can run a few commands to fix it manually.<\/p>\n<p>In this <a href=\"https:\/\/pureinfotech.com\/tag\/how-to\">guide<\/a>, I&#8217;ll outline the different ways to fix the LocalHost problem on Windows 11.<\/p>\n<h3>Fix LocalHost problem after installing update KB5066835 on Windows 11<\/h3>\n<p>You can try to resolve this networking issue in two ways.<\/p>\n<h3>Resolve LocalHost issue automatically<\/h3>\n<p>To install the Known Issue Rollback package on Windows 11 manually, follow these steps:<\/p>\n<ol>\n<li>\n<p>Open <strong>Settings<\/strong> on Windows 11.<\/p>\n<\/li>\n<li>\n<p>Click on <strong>Windows Update<\/strong>.<\/p>\n<\/li>\n<li>\n<p>Click the <strong>Check for updates<\/strong> button.<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-181943\" src=\"https:\/\/i0.wp.com\/pureinfotech.com\/wp-content\/uploads\/2025\/10\/windows-11-check-updates.webp?resize=827%2C570&#038;quality=78&#038;strip=all&#038;ssl=1\" alt=\"Windows 11 check for updates\" width=\"827\" height=\"570\" srcset=\"https:\/\/i0.wp.com\/pureinfotech.com\/wp-content\/uploads\/2025\/10\/windows-11-check-updates.webp?w=919&amp;quality=78&amp;strip=all&amp;ssl=1 919w, https:\/\/i0.wp.com\/pureinfotech.com\/wp-content\/uploads\/2025\/10\/windows-11-check-updates.webp?resize=300%2C207&amp;quality=78&amp;strip=all&amp;ssl=1 300w, https:\/\/i0.wp.com\/pureinfotech.com\/wp-content\/uploads\/2025\/10\/windows-11-check-updates.webp?resize=833%2C574&amp;quality=78&amp;strip=all&amp;ssl=1 833w, https:\/\/i0.wp.com\/pureinfotech.com\/wp-content\/uploads\/2025\/10\/windows-11-check-updates.webp?resize=150%2C103&amp;quality=78&amp;strip=all&amp;ssl=1 150w\" sizes=\"auto, (max-width: 827px) 100vw, 827px\" \/><\/li>\n<li>\n<p>Click the <strong>Restart now<\/strong> button.<\/p>\n<\/li>\n<\/ol>\n<p>Once you complete the steps, if the fix is available for your computer, it will download and install automatically on Windows 11.<\/p>\n<h3>Resolve LocalHost issue manually<\/h3>\n<div id=\"tip-box\"><span><strong>Warning:<\/strong> It&#8217;s crucial to note that modifying the Registry can cause severe problems if improperly used. It&#8217;s assumed you know what you&#8217;re doing and have <a href=\"https:\/\/pureinfotech.com\/backup-windows-11-external-usb-drive\/\">created a full backup<\/a> of your system before proceeding.<\/span><\/div>\n<p>To fix the IIS problem affecting the LocalHost connection, follow these steps:<\/p>\n<ol>\n<li>\n<p>Open <strong>Start<\/strong>.<\/p>\n<\/li>\n<li>\n<p>Search for <strong>PowerShell<\/strong> (or <strong>Terminal<\/strong>), right-click the top result, and select the <strong>Run as administrator<\/strong> option.<\/p>\n<\/li>\n<li>\n<p>Type the following command to create the <strong>EnableHttp2Tls<\/strong> DWORD and set it to <strong>zero<\/strong>, and press <strong>Enter<\/strong>:<\/p>\n<pre>New-ItemProperty -Path 'HKLM:\\SYSTEM\\CurrentControlSet\\Services\\HTTP\\Parameters' -Name 'EnableHttp2Tls' -PropertyType dword -Value 0 -Force<\/pre>\n<\/li>\n<li>\n<p>Type the following command to create the <strong>EnableHttp2Cleartext<\/strong> DWORD and set it to <strong>zero<\/strong>, and press <strong>Enter<\/strong>:<\/p>\n<pre>New-ItemProperty -Path 'HKLM:\\SYSTEM\\CurrentControlSet\\Services\\HTTP\\Parameters' -Name 'EnableHttp2Cleartext' -PropertyType dword -Value 0 -Force<\/pre>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-181944\" src=\"https:\/\/i0.wp.com\/pureinfotech.com\/wp-content\/uploads\/2025\/10\/powershell-fix-localhost.webp?resize=827%2C631&#038;quality=78&#038;strip=all&#038;ssl=1\" alt=\"PowerShell fix LocalHost\" width=\"827\" height=\"631\" srcset=\"https:\/\/i0.wp.com\/pureinfotech.com\/wp-content\/uploads\/2025\/10\/powershell-fix-localhost.webp?w=898&amp;quality=78&amp;strip=all&amp;ssl=1 898w, https:\/\/i0.wp.com\/pureinfotech.com\/wp-content\/uploads\/2025\/10\/powershell-fix-localhost.webp?resize=300%2C229&amp;quality=78&amp;strip=all&amp;ssl=1 300w, https:\/\/i0.wp.com\/pureinfotech.com\/wp-content\/uploads\/2025\/10\/powershell-fix-localhost.webp?resize=752%2C574&amp;quality=78&amp;strip=all&amp;ssl=1 752w, https:\/\/i0.wp.com\/pureinfotech.com\/wp-content\/uploads\/2025\/10\/powershell-fix-localhost.webp?resize=150%2C114&amp;quality=78&amp;strip=all&amp;ssl=1 150w\" sizes=\"auto, (max-width: 827px) 100vw, 827px\" \/><\/li>\n<li>\n<p>Restart the computer.<\/p>\n<\/li>\n<\/ol>\n<p>After you complete the steps, web applications running locally should load correctly on Windows 11.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Microsoft breaks LocalHost connections for local web apps after installing the October 2025 update on Windows 11, but here&#8217;s a quick fix.<\/p>\n","protected":false},"author":2,"featured_media":181947,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"jetpack_post_was_ever_published":false,"footnotes":""},"categories":[23],"tags":[19,2715,2744,2746,2576],"class_list":["post-181938","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-windows","tag-how-to","tag-windows-11","tag-windows-11-24h2","tag-windows-11-25h2","tag-windows-help"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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With over 21 years as a technology writer and IT Specialist, Mauro specializes in Windows, software, and cross-platform systems such as Linux, Android, and macOS. Certifications he holds include Microsoft Certified Solutions Associate (MCSA), Cisco Certified Network Professional (CCNP), VMware Certified Professional (VCP), and CompTIA A+ and Network+. Mauro is a recognized Microsoft MVP and has also been a long-time contributor to Windows Central. You can follow him on YouTube, Threads, BlueSky, X (Twitter), LinkedIn and About.me. 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