{"id":15846,"date":"2025-10-16T10:00:52","date_gmt":"2025-10-16T04:30:52","guid":{"rendered":"https:\/\/www.skynats.com\/?p=15846"},"modified":"2025-10-16T12:36:58","modified_gmt":"2025-10-16T07:06:58","slug":"how-to-resolve-nftables-loading-errors-caused-by-iptables-nft-on-almalinux-9","status":"publish","type":"post","link":"https:\/\/www.skynats.com\/blog\/how-to-resolve-nftables-loading-errors-caused-by-iptables-nft-on-almalinux-9\/","title":{"rendered":"How to Resolve nftables Loading Errors Caused by iptables-nft on AlmaLinux 9"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-small-font-size\" id=\"h-introduction\"><strong>Introduction<\/strong><\/h2>\n\n\n\n<p>As modern Linux distributions transition from iptables to nftables, some compatibility issues are beginning to emerge\u2014particularly for those using iptables-nft, the translation layer between old iptables syntax and nftables. If you&#8217;re running AlmaLinux 9 or CloudLinux 9 and have followed steps to install iptables on AlmaLinux 9, you may encounter errors when starting the nftables service. This issue typically manifests with the following error:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Error: unsupported xtables compat expression, use iptables-nft with this ruleset<\/code><\/pre>\n\n\n\n<p>This error prevents the nftables firewall from loading stored rules, which can potentially compromise server security if not addressed.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" width=\"1024\" height=\"21\" sizes=\"(max-width: 1024px) 100vw, 1024px\" src=\"https:\/\/www.skynats.com\/blog\/wp-content\/uploads\/2025\/10\/image-1-1024x21.png\" alt=\"\" class=\"wp-image-15847\" style=\"width:959px;height:auto\" srcset=\"https:\/\/www.skynats.com\/blog\/wp-content\/uploads\/2025\/10\/image-1-1024x21.png 1024w, https:\/\/www.skynats.com\/blog\/wp-content\/uploads\/2025\/10\/image-1-300x6.png 300w, https:\/\/www.skynats.com\/blog\/wp-content\/uploads\/2025\/10\/image-1-768x16.png 768w, https:\/\/www.skynats.com\/blog\/wp-content\/uploads\/2025\/10\/image-1.png 1103w\" \/><\/figure>\n\n\n\n<p>Many system administrators still rely on tools like CSF (ConfigServer Security &amp; Firewall) and Imunify360 for firewall management. These tools often use traditional iptables syntax, which is then converted into nftables format by the iptables-nft package.<\/p>\n\n\n\n<p>While this translation works in-memory, issues arise when the converted rules are saved and later reloaded via the nftables service. Some rules, particularly those involving xtables compatibility, cannot be reloaded from configuration files.<\/p>\n\n\n\n<p>This results in the nftables service failing to start with the error mentioned earlier.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-small-font-size\"><strong>Impacted Systems<\/strong><\/h2>\n\n\n\n<p>This issue has been observed on systems that meet the following conditions:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Running AlmaLinux 9 or CloudLinux 9<\/li>\n\n\n\n<li>Using iptables-nft<\/li>\n\n\n\n<li>Relying on third-party firewalls such as:\n<ul class=\"wp-block-list\">\n<li>Imunify360<\/li>\n\n\n\n<li><strong>CS<\/strong><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-small-font-size\"><strong>Workaround: Rebuild a Minimal NFTables Configuration<\/strong><\/h3>\n\n\n\n<p>To resolve the issue and allow the nftables service to start properly, the recommended approach is to rebuild a minimal configuration that excludes problematic rules. Third-party firewalls will restore their own rules when restarted.<\/p>\n\n\n\n<p>Here\u2019s a step-by-step guide to perform this fix:<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-small-font-size\"><strong>Step-by-Step Instructions<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading has-small-font-size\"><strong>1. Stop External Firewall Services<\/strong><\/h3>\n\n\n\n<p>Before modifying the firewall, stop any external services that may inject rules.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>If you&#8217;re using Imunify360:<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>systemctl stop imunify360<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading has-small-font-size\" id=\"h-2-if-you-re-using-csf\">2. <strong>If you&#8217;re using CSF:<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>csf -x<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading has-small-font-size\"><strong>2. Backup Existing nftables Configuration<\/strong><\/h3>\n\n\n\n<p>Move the existing configuration file to avoid overwriting or losing custom rules.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>mv \/etc\/sysconfig\/nftables.conf \/etc\/sysconfig\/nftables.conf.back<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading has-small-font-size\"><strong>3. Flush Existing Firewall Rules<\/strong><\/h3>\n\n\n\n<p>Clear all active nftables rules from memory.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>nft flush ruleset<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading has-small-font-size\"><strong>4. Rebuild Default cPanel Firewall Rules<\/strong><\/h3>\n\n\n\n<p>Use cPanel\u2019s built-in script to regenerate a minimal, compatible rule set.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/scripts\/configure_firewall_for_cpanel<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading has-small-font-size\"><strong>5. Save Current Rules to Configuration File<\/strong><\/h3>\n\n\n\n<p>Export the active ruleset to the default configuration file used by the nftables service.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>nft list ruleset &gt; \/etc\/sysconfig\/nftables.conf<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading has-small-font-size\"><strong>6. Restart External Firewall Services<\/strong><\/h3>\n\n\n\n<p>Once the minimal nftables configuration is saved, restart your third-party firewalls.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>For Imunify360:<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>systemctl restart imunify360<\/code><\/pre>\n\n\n\n<p>2. <strong>For CSF:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>csf -e<\/code><\/pre>\n\n\n\n<p>This solution ensures that nftables starts properly by avoiding errors caused by incompatible rules. Once restarted, third-party firewalls like CSF and Imunify360 will automatically restore their own rules. It&#8217;s not necessary to include every firewall rule in the nftables.conf file, only the critical ones needed for <a href=\"https:\/\/www.cpanel.net\/\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-secondary-color\">cPanel<\/mark><\/a> operations should be saved there.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-small-font-size\"><strong>Conclusion<\/strong><\/h3>\n\n\n\n<p>As server environments continue migrating to modern firewall backends like nftables, issues like these are bound to arise. By following the steps above, you can restore functionality and ensure your firewall rules are loaded correctly during system startup.<\/p>\n\n\n\n<p>If you\u2019re still facing issues after trying these steps to resolve nftables loading errors, our experts can help. Skynats offers <a href=\"https:\/\/www.skynats.com\/linux-server-management\/\">Linux Server Management services<\/a> and <a href=\"https:\/\/www.skynats.com\/server-management\/\">Server Management services<\/a> to handle complex configurations and firewall issues with ease. Contact us today for professional assistance to install iptables on AlmaLinux 9 and ensure your server runs securely and efficiently.<br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction As modern Linux distributions transition from iptables to nftables, some compatibility issues are beginning to emerge\u2014particularly for those using iptables-nft, the translation layer between old iptables syntax and nftables. If you&#8217;re running AlmaLinux 9 or CloudLinux 9 and have followed steps to install iptables on AlmaLinux 9, you may encounter errors when starting the [&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":[1127,1138,1137,1135,1010,1136,302],"class_list":["post-15846","post","type-post","status-publish","format-standard","hentry","category-blog","tag-almalinux-9","tag-cpanel-firewall-rules","tag-errors-caused-by-iptables-nft","tag-iptables-nft","tag-linux-server-management-services","tag-resolve-nftables","tag-server-management-services"],"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>Install iptables AlmaLinux 9 \u2013 Fix nftables Loading Errors Fast<\/title>\n<meta name=\"description\" content=\"Fix nftables loading errors easily! Learn how to install iptables on AlmaLinux 9 and keep your server running smoothly\u2014read 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-resolve-nftables-loading-errors-caused-by-iptables-nft-on-almalinux-9\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Resolve nftables Loading Errors Caused by iptables-nft on AlmaLinux 9\" \/>\n<meta property=\"og:description\" content=\"Fix nftables loading errors easily! 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