{"id":17134,"date":"2025-12-12T17:05:20","date_gmt":"2025-12-12T11:35:20","guid":{"rendered":"https:\/\/www.skynats.com\/?p=17134"},"modified":"2025-12-15T17:37:53","modified_gmt":"2025-12-15T12:07:53","slug":"how-to-fix-plesk-update-errors-caused-by-ipv6-connectivity-issues","status":"publish","type":"post","link":"https:\/\/www.skynats.com\/blog\/how-to-fix-plesk-update-errors-caused-by-ipv6-connectivity-issues\/","title":{"rendered":"How to Fix Plesk Update Errors Caused by IPv6 Connectivity Issues"},"content":{"rendered":"\n<p>System administrators often encounter unexpected issues while performing routine updates. One such common problem arises when Plesk attempts to verify connectivity during an upgrade, especially on servers where IPv6 is enabled but not fully configured.<\/p>\n\n\n\n<p>Recently, while updating <a href=\"https:\/\/www.plesk.com\/\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-secondary-color\">Plesk<\/mark><\/a>, I ran into the following error:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-dominant-color=\"1f1f1f\" data-has-transparency=\"false\" style=\"--dominant-color: #1f1f1f;\" fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"72\" sizes=\"(max-width: 1024px) 100vw, 1024px\" src=\"https:\/\/www.skynats.com\/blog\/wp-content\/uploads\/2025\/12\/image-1024x72.webp\" alt=\"\" class=\"wp-image-17135 not-transparent\" srcset=\"https:\/\/www.skynats.com\/blog\/wp-content\/uploads\/2025\/12\/image-1024x72.webp 1024w, https:\/\/www.skynats.com\/blog\/wp-content\/uploads\/2025\/12\/image-300x21.webp 300w, https:\/\/www.skynats.com\/blog\/wp-content\/uploads\/2025\/12\/image-768x54.webp 768w, https:\/\/www.skynats.com\/blog\/wp-content\/uploads\/2025\/12\/image-1536x108.webp 1536w, https:\/\/www.skynats.com\/blog\/wp-content\/uploads\/2025\/12\/image-1200x84.webp 1200w, https:\/\/www.skynats.com\/blog\/wp-content\/uploads\/2025\/12\/image.webp 1600w\" \/><\/figure>\n\n\n\n<p>Plesk was unable to connect to required ports over IPv6, causing the pre-upgrade checker to fail. The root cause was simple: IPv6 was enabled on the server, but the network or firewall did not properly support IPv6 routing<strong>,<\/strong> leading to timeouts on ports 8880 and 8443.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-small-font-size\" id=\"h-why-this-error-occurs\"><strong>Why This Error Occurs<\/strong><\/h2>\n\n\n\n<p>Plesk attempts to verify its accessibility over all configured IP addresses\u2014both IPv4 and IPv6.<br>If the server has IPv6 enabled but:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The hosting provider does not route IPv6 properly<\/li>\n\n\n\n<li>Firewall rules do not allow traffic on IPv6<\/li>\n\n\n\n<li>The IPv6 stack is misconfigured<\/li>\n<\/ul>\n\n\n\n<p>Then Plesk cannot reach itself, resulting in connectivity and upgrade warnings.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-small-font-size\" id=\"h-solution-disable-ipv6-on-the-server-and-in-plesk\"><strong>Solution: Disable IPv6 on the Server and in Plesk<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading has-small-font-size\" id=\"h-1-remove-ipv6-assignments-from-hosted-domains\"><strong>1. Remove IPv6 Assignments From Hosted Domains<\/strong><\/h3>\n\n\n\n<p>Before disabling IPv6 globally, ensure no domains rely on it.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Go to: <strong>Tools &amp; Settings \u2192 IP Addresses<\/strong><\/li>\n\n\n\n<li>Select the IPv6 address<\/li>\n\n\n\n<li>Check the <strong>Sites<\/strong> column<br><\/li>\n\n\n\n<li>For each domain using IPv6:\n<ul class=\"wp-block-list\">\n<li>Go to <strong>Domains \u2192 &lt;domain> \u2192 Web Hosting Access<\/strong><\/li>\n\n\n\n<li>Set <strong>IPv6 address<\/strong> to <strong>None<\/strong><\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p>This prevents Plesk from breaking domain configurations after IPv6 removal.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-small-font-size\"><strong>2. Disable IPv6 at OS Level<\/strong><\/h3>\n\n\n\n<p>SSH into the server and add the following lines to \/etc\/sysctl.conf:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>net.ipv6.conf.all.disable_ipv6=1\nnet.ipv6.conf.default.disable_ipv6=1<\/code><\/pre>\n\n\n\n<p>Apply the configuration:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sysctl -p<\/code><\/pre>\n\n\n\n<p>This completely disables the IPv6 networking stack on the operating system.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-small-font-size\"><strong>3. Remove IPv6 From Plesk<\/strong><\/h3>\n\n\n\n<p>Finally, tell Plesk to forget IPv6 addresses.<\/p>\n\n\n\n<p>You can either remove them manually or use the auto-detection feature:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Tools &amp; Settings \u2192 IP Addresses \u2192 Reread IPs<\/code><\/pre>\n\n\n\n<p>This forces Plesk to rescan the interface list and remove IPv6 entries that no longer exist.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-small-font-size\" id=\"h-4-proceed-with-the-plesk-update\"><strong>4. Proceed With the Plesk Update<\/strong><\/h3>\n\n\n\n<p>After completing the above steps, simply continue running the Plesk update. With IPv6 fully disabled and removed, the update process will proceed smoothly without any port connectivity errors.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-small-font-size\"><strong>Conclusion<\/strong><\/h3>\n\n\n\n<p>This solution is helpful for any server where:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>IPv6 is enabled by default by the hosting provider<\/li>\n\n\n\n<li>IPv6 is not actively used<\/li>\n\n\n\n<li>Plesk updates fail with port connectivity warnings<\/li>\n<\/ul>\n\n\n\n<p>If your system doesn\u2019t rely on IPv6, disabling it can reduce complexity and prevent similar issues during future updates.<\/p>\n\n\n\n<p>If you\u2019re still facing<strong> <\/strong>IPv6 Connectivity Issues Causing Plesk Update Error, our experts are here to help. With reliable <a href=\"https:\/\/www.skynats.com\/plesk-server-management\/ \">Plesk Server Management Services<\/a> and <a href=\"https:\/\/www.skynats.com\/linux-server-management\/\">Linux Server Support Services<\/a>, we ensure smooth updates, stable networking, and hassle-free server operations. Contact us today for professional assistance and peace of mind.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>System administrators often encounter unexpected issues while performing routine updates. One such common problem arises when Plesk attempts to verify connectivity during an upgrade, especially on servers where IPv6 is enabled but not fully configured. Recently, while updating Plesk, I ran into the following error: Plesk was unable to connect to required ports over IPv6, [&hellip;]<\/p>\n","protected":false},"author":14,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[1192,1160,741,1004,1193],"class_list":["post-17134","post","type-post","status-publish","format-standard","hentry","category-blog","tag-ipv6-connectivity-issues","tag-linux-server-support-services","tag-plesk","tag-plesk-server-management-services","tag-remove-ipv6"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.9 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>IPv6 Connectivity Issues Causing Plesk Update Error \u2013 How to Fix<\/title>\n<meta name=\"description\" content=\"Fix IPv6 Connectivity Issues Causing Plesk Update Error with this step-by-step guide. Restore updates fast\u2014fix it now!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.skynats.com\/blog\/how-to-fix-plesk-update-errors-caused-by-ipv6-connectivity-issues\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Fix Plesk Update Errors Caused by IPv6 Connectivity Issues\" \/>\n<meta property=\"og:description\" content=\"Fix IPv6 Connectivity Issues Causing Plesk Update Error with this step-by-step guide. Restore updates fast\u2014fix it now!\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.skynats.com\/blog\/how-to-fix-plesk-update-errors-caused-by-ipv6-connectivity-issues\/\" \/>\n<meta property=\"og:site_name\" content=\"Server Management Services | Cloud Management | Skynats\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/skynats\" \/>\n<meta property=\"article:published_time\" content=\"2025-12-12T11:35:20+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-12-15T12:07:53+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.skynats.com\/blog\/wp-content\/uploads\/2025\/12\/image-1024x72.webp\" \/>\n<meta name=\"author\" content=\"Jishnu V\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@skynatstech\" \/>\n<meta name=\"twitter:site\" content=\"@skynatstech\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jishnu V\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.skynats.com\\\/blog\\\/how-to-fix-plesk-update-errors-caused-by-ipv6-connectivity-issues\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.skynats.com\\\/blog\\\/how-to-fix-plesk-update-errors-caused-by-ipv6-connectivity-issues\\\/\"},\"author\":{\"name\":\"Jishnu V\",\"@id\":\"https:\\\/\\\/www.skynats.com\\\/blog\\\/#\\\/schema\\\/person\\\/c63611da5e22d216e38d8658e5a605c5\"},\"headline\":\"How to Fix Plesk Update Errors Caused by IPv6 Connectivity Issues\",\"datePublished\":\"2025-12-12T11:35:20+00:00\",\"dateModified\":\"2025-12-15T12:07:53+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.skynats.com\\\/blog\\\/how-to-fix-plesk-update-errors-caused-by-ipv6-connectivity-issues\\\/\"},\"wordCount\":428,\"publisher\":{\"@id\":\"https:\\\/\\\/www.skynats.com\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.skynats.com\\\/blog\\\/how-to-fix-plesk-update-errors-caused-by-ipv6-connectivity-issues\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.skynats.com\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/image-1024x72.webp\",\"keywords\":[\"IPv6 Connectivity Issues\",\"Linux server support services\",\"Plesk\",\"Plesk Server Management Services\",\"Remove IPv6\"],\"articleSection\":[\"Blog\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.skynats.com\\\/blog\\\/how-to-fix-plesk-update-errors-caused-by-ipv6-connectivity-issues\\\/\",\"url\":\"https:\\\/\\\/www.skynats.com\\\/blog\\\/how-to-fix-plesk-update-errors-caused-by-ipv6-connectivity-issues\\\/\",\"name\":\"IPv6 Connectivity Issues Causing Plesk Update Error \u2013 How to Fix\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.skynats.com\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.skynats.com\\\/blog\\\/how-to-fix-plesk-update-errors-caused-by-ipv6-connectivity-issues\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.skynats.com\\\/blog\\\/how-to-fix-plesk-update-errors-caused-by-ipv6-connectivity-issues\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.skynats.com\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/image-1024x72.webp\",\"datePublished\":\"2025-12-12T11:35:20+00:00\",\"dateModified\":\"2025-12-15T12:07:53+00:00\",\"description\":\"Fix IPv6 Connectivity Issues Causing Plesk Update Error with this step-by-step guide. 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