{"id":3608,"date":"2026-05-19T12:36:40","date_gmt":"2026-05-19T12:36:40","guid":{"rendered":"https:\/\/pheonixsolutions.com\/knowledge-base\/?p=3608"},"modified":"2026-05-19T12:36:43","modified_gmt":"2026-05-19T12:36:43","slug":"how-to-disable-quic-in-litespeed-on-cpanel-servers","status":"publish","type":"post","link":"https:\/\/pheonixsolutions.com\/knowledge-base\/2026\/05\/19\/how-to-disable-quic-in-litespeed-on-cpanel-servers\/","title":{"rendered":"How to Disable QUIC in LiteSpeed on cPanel Servers"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Introduction<\/h2>\n\n\n\n<p>When LiteSpeed is installed on a cPanel &amp; WHM server, QUIC support is enabled by default for HTTPS virtual hosts. QUIC uses UDP port 443 to improve connection performance and reduce latency.<\/p>\n\n\n\n<p>In some environments, administrators may need to disable QUIC globally or for specific domains due to firewall restrictions, compatibility concerns, or troubleshooting requirements.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Prerequisites<\/h2>\n\n\n\n<p>Before proceeding, ensure the following:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Root access to the server<\/li>\n\n\n\n<li>LiteSpeed installed on a cPanel &amp; WHM server<\/li>\n\n\n\n<li>Access to modify server configuration files<\/li>\n\n\n\n<li>Basic knowledge of Linux commands<\/li>\n\n\n\n<li>Backup of existing configuration files before making changes<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Implementation<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">I. Disable QUIC for All Domains<\/h3>\n\n\n\n<p>To disable QUIC globally across the server, follow these steps.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 1: Edit the Global Apache Include File<\/h3>\n\n\n\n<p>Open the following file:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/etc\/apache2\/conf.d\/includes\/pre_main_global.conf<\/code><\/pre>\n\n\n\n<p>Add the following configuration:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;IfModule LiteSpeed&gt;<br>QuicEnable off<br>&lt;\/IfModule&gt;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Step 2: Rebuild Apache Configuration and Restart LiteSpeed<\/h3>\n\n\n\n<p>Run the following command:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/usr\/local\/cpanel\/scripts\/rebuildhttpdconf &amp;&amp; \/usr\/local\/cpanel\/scripts\/restartsrv_apache<\/code><\/pre>\n\n\n\n<p>This rebuilds the Apache configuration and restarts the LiteSpeed service.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">II. Disable QUIC for a Specific Domain<\/h3>\n\n\n\n<p>To disable QUIC only for a particular domain or virtual host, create custom userdata include files for both SSL and non-SSL virtual hosts.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 1: Create the Non-SSL Userdata Directory<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>mkdir -p \/etc\/apache2\/conf.d\/userdata\/std\/2_4\/$user\/$domain\/<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Step 2: Create the SSL Userdata Directory<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>mkdir -p \/etc\/apache2\/conf.d\/userdata\/ssl\/2_4\/$user\/$domain\/<\/code><\/pre>\n\n\n\n<p>Replace:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>$user<\/code> with the cPanel account username<\/li>\n\n\n\n<li><code>$domain<\/code> with the target domain name<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Step 3: Create the QUIC Configuration File<\/h3>\n\n\n\n<p>Inside both directories, create the file:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>quic_vhosts.conf<\/code><\/pre>\n\n\n\n<p>Add the following content:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;IfModule LiteSpeed&gt;<br>QuicEnable off<br>&lt;\/IfModule&gt;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Step 4: Rebuild Configuration and Restart LiteSpeed<\/h3>\n\n\n\n<p>Run the following command:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/usr\/local\/cpanel\/scripts\/rebuildhttpdconf &amp;&amp; \/usr\/local\/cpanel\/scripts\/restartsrv_apache<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">Verification<\/h4>\n\n\n\n<p>After applying the configuration changes, verify that QUIC is disabled by checking the HTTP response headers or using online HTTP\/3\/QUIC testing tools.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Notes<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>QUIC primarily affects HTTP\/3 connections.<\/li>\n\n\n\n<li>Disabling QUIC does not disable HTTPS functionality.<\/li>\n\n\n\n<li>Ensure UDP port 443 handling aligns with your firewall and network configuration.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>Disabling QUIC in LiteSpeed can help resolve compatibility, firewall, or networking issues in certain environments. Administrators can either disable QUIC globally for all hosted domains or selectively for specific virtual hosts based on operational requirements. After making configuration changes, always rebuild the Apache configuration and restart the LiteSpeed service to apply the updates successfully.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction When LiteSpeed is installed on a cPanel &amp; WHM server, QUIC support is enabled by default for HTTPS virtual hosts. QUIC uses UDP port 443 to improve connection performance and reduce latency. In some environments, administrators may need to disable QUIC globally or for specific domains due to firewall restrictions, compatibility concerns, or troubleshooting ..<\/p>\n<div class=\"clear-fix\"><\/div>\n<p><a href=\"https:\/\/pheonixsolutions.com\/knowledge-base\/2026\/05\/19\/how-to-disable-quic-in-litespeed-on-cpanel-servers\/\" title=\"read more...\">Read more<\/a><\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3608","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Disable QUIC in LiteSpeed on cPanel Servers - PheonixSolutions Knowledge-Base<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/pheonixsolutions.com\/knowledge-base\/2026\/05\/19\/how-to-disable-quic-in-litespeed-on-cpanel-servers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Disable QUIC in LiteSpeed on cPanel Servers - PheonixSolutions Knowledge-Base\" \/>\n<meta property=\"og:description\" content=\"Introduction When LiteSpeed is installed on a cPanel &amp; WHM server, QUIC support is enabled by default for HTTPS virtual hosts. QUIC uses UDP port 443 to improve connection performance and reduce latency. In some environments, administrators may need to disable QUIC globally or for specific domains due to firewall restrictions, compatibility concerns, or troubleshooting ..Read more\" \/>\n<meta property=\"og:url\" content=\"https:\/\/pheonixsolutions.com\/knowledge-base\/2026\/05\/19\/how-to-disable-quic-in-litespeed-on-cpanel-servers\/\" \/>\n<meta property=\"og:site_name\" content=\"PheonixSolutions Knowledge-Base\" \/>\n<meta property=\"article:published_time\" content=\"2026-05-19T12:36:40+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-19T12:36:43+00:00\" \/>\n<meta name=\"author\" content=\"meenakshi k\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"meenakshi k\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/pheonixsolutions.com\\\/knowledge-base\\\/2026\\\/05\\\/19\\\/how-to-disable-quic-in-litespeed-on-cpanel-servers\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/pheonixsolutions.com\\\/knowledge-base\\\/2026\\\/05\\\/19\\\/how-to-disable-quic-in-litespeed-on-cpanel-servers\\\/\"},\"author\":{\"name\":\"meenakshi k\",\"@id\":\"https:\\\/\\\/pheonixsolutions.com\\\/knowledge-base\\\/#\\\/schema\\\/person\\\/baf2a3c7578108699459ee9dfee7211f\"},\"headline\":\"How to Disable QUIC in LiteSpeed on cPanel Servers\",\"datePublished\":\"2026-05-19T12:36:40+00:00\",\"dateModified\":\"2026-05-19T12:36:43+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/pheonixsolutions.com\\\/knowledge-base\\\/2026\\\/05\\\/19\\\/how-to-disable-quic-in-litespeed-on-cpanel-servers\\\/\"},\"wordCount\":337,\"commentCount\":0,\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/pheonixsolutions.com\\\/knowledge-base\\\/2026\\\/05\\\/19\\\/how-to-disable-quic-in-litespeed-on-cpanel-servers\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/pheonixsolutions.com\\\/knowledge-base\\\/2026\\\/05\\\/19\\\/how-to-disable-quic-in-litespeed-on-cpanel-servers\\\/\",\"url\":\"https:\\\/\\\/pheonixsolutions.com\\\/knowledge-base\\\/2026\\\/05\\\/19\\\/how-to-disable-quic-in-litespeed-on-cpanel-servers\\\/\",\"name\":\"How to Disable QUIC in LiteSpeed on cPanel Servers - PheonixSolutions Knowledge-Base\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/pheonixsolutions.com\\\/knowledge-base\\\/#website\"},\"datePublished\":\"2026-05-19T12:36:40+00:00\",\"dateModified\":\"2026-05-19T12:36:43+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/pheonixsolutions.com\\\/knowledge-base\\\/#\\\/schema\\\/person\\\/baf2a3c7578108699459ee9dfee7211f\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/pheonixsolutions.com\\\/knowledge-base\\\/2026\\\/05\\\/19\\\/how-to-disable-quic-in-litespeed-on-cpanel-servers\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/pheonixsolutions.com\\\/knowledge-base\\\/2026\\\/05\\\/19\\\/how-to-disable-quic-in-litespeed-on-cpanel-servers\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/pheonixsolutions.com\\\/knowledge-base\\\/2026\\\/05\\\/19\\\/how-to-disable-quic-in-litespeed-on-cpanel-servers\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/pheonixsolutions.com\\\/knowledge-base\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"How to Disable QUIC in LiteSpeed on cPanel Servers\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/pheonixsolutions.com\\\/knowledge-base\\\/#website\",\"url\":\"https:\\\/\\\/pheonixsolutions.com\\\/knowledge-base\\\/\",\"name\":\"PheonixSolutions Knowledge-Base\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/pheonixsolutions.com\\\/knowledge-base\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/pheonixsolutions.com\\\/knowledge-base\\\/#\\\/schema\\\/person\\\/baf2a3c7578108699459ee9dfee7211f\",\"name\":\"meenakshi k\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/17c0a3923b9a31a41d8de2fdc928e514efe879fe17b6e5d2814b7f81ed2356e5?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/17c0a3923b9a31a41d8de2fdc928e514efe879fe17b6e5d2814b7f81ed2356e5?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/17c0a3923b9a31a41d8de2fdc928e514efe879fe17b6e5d2814b7f81ed2356e5?s=96&d=mm&r=g\",\"caption\":\"meenakshi k\"},\"url\":\"https:\\\/\\\/pheonixsolutions.com\\\/knowledge-base\\\/author\\\/meenakshi\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"How to Disable QUIC in LiteSpeed on cPanel Servers - PheonixSolutions Knowledge-Base","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/pheonixsolutions.com\/knowledge-base\/2026\/05\/19\/how-to-disable-quic-in-litespeed-on-cpanel-servers\/","og_locale":"en_US","og_type":"article","og_title":"How to Disable QUIC in LiteSpeed on cPanel Servers - PheonixSolutions Knowledge-Base","og_description":"Introduction When LiteSpeed is installed on a cPanel &amp; WHM server, QUIC support is enabled by default for HTTPS virtual hosts. QUIC uses UDP port 443 to improve connection performance and reduce latency. In some environments, administrators may need to disable QUIC globally or for specific domains due to firewall restrictions, compatibility concerns, or troubleshooting ..Read more","og_url":"https:\/\/pheonixsolutions.com\/knowledge-base\/2026\/05\/19\/how-to-disable-quic-in-litespeed-on-cpanel-servers\/","og_site_name":"PheonixSolutions Knowledge-Base","article_published_time":"2026-05-19T12:36:40+00:00","article_modified_time":"2026-05-19T12:36:43+00:00","author":"meenakshi k","twitter_card":"summary_large_image","twitter_misc":{"Written by":"meenakshi k","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/pheonixsolutions.com\/knowledge-base\/2026\/05\/19\/how-to-disable-quic-in-litespeed-on-cpanel-servers\/#article","isPartOf":{"@id":"https:\/\/pheonixsolutions.com\/knowledge-base\/2026\/05\/19\/how-to-disable-quic-in-litespeed-on-cpanel-servers\/"},"author":{"name":"meenakshi k","@id":"https:\/\/pheonixsolutions.com\/knowledge-base\/#\/schema\/person\/baf2a3c7578108699459ee9dfee7211f"},"headline":"How to Disable QUIC in LiteSpeed on cPanel Servers","datePublished":"2026-05-19T12:36:40+00:00","dateModified":"2026-05-19T12:36:43+00:00","mainEntityOfPage":{"@id":"https:\/\/pheonixsolutions.com\/knowledge-base\/2026\/05\/19\/how-to-disable-quic-in-litespeed-on-cpanel-servers\/"},"wordCount":337,"commentCount":0,"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/pheonixsolutions.com\/knowledge-base\/2026\/05\/19\/how-to-disable-quic-in-litespeed-on-cpanel-servers\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/pheonixsolutions.com\/knowledge-base\/2026\/05\/19\/how-to-disable-quic-in-litespeed-on-cpanel-servers\/","url":"https:\/\/pheonixsolutions.com\/knowledge-base\/2026\/05\/19\/how-to-disable-quic-in-litespeed-on-cpanel-servers\/","name":"How to Disable QUIC in LiteSpeed on cPanel Servers - PheonixSolutions Knowledge-Base","isPartOf":{"@id":"https:\/\/pheonixsolutions.com\/knowledge-base\/#website"},"datePublished":"2026-05-19T12:36:40+00:00","dateModified":"2026-05-19T12:36:43+00:00","author":{"@id":"https:\/\/pheonixsolutions.com\/knowledge-base\/#\/schema\/person\/baf2a3c7578108699459ee9dfee7211f"},"breadcrumb":{"@id":"https:\/\/pheonixsolutions.com\/knowledge-base\/2026\/05\/19\/how-to-disable-quic-in-litespeed-on-cpanel-servers\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/pheonixsolutions.com\/knowledge-base\/2026\/05\/19\/how-to-disable-quic-in-litespeed-on-cpanel-servers\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/pheonixsolutions.com\/knowledge-base\/2026\/05\/19\/how-to-disable-quic-in-litespeed-on-cpanel-servers\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/pheonixsolutions.com\/knowledge-base\/"},{"@type":"ListItem","position":2,"name":"How to Disable QUIC in LiteSpeed on cPanel Servers"}]},{"@type":"WebSite","@id":"https:\/\/pheonixsolutions.com\/knowledge-base\/#website","url":"https:\/\/pheonixsolutions.com\/knowledge-base\/","name":"PheonixSolutions Knowledge-Base","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/pheonixsolutions.com\/knowledge-base\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/pheonixsolutions.com\/knowledge-base\/#\/schema\/person\/baf2a3c7578108699459ee9dfee7211f","name":"meenakshi k","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/17c0a3923b9a31a41d8de2fdc928e514efe879fe17b6e5d2814b7f81ed2356e5?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/17c0a3923b9a31a41d8de2fdc928e514efe879fe17b6e5d2814b7f81ed2356e5?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/17c0a3923b9a31a41d8de2fdc928e514efe879fe17b6e5d2814b7f81ed2356e5?s=96&d=mm&r=g","caption":"meenakshi k"},"url":"https:\/\/pheonixsolutions.com\/knowledge-base\/author\/meenakshi\/"}]}},"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/pheonixsolutions.com\/knowledge-base\/wp-json\/wp\/v2\/posts\/3608","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pheonixsolutions.com\/knowledge-base\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pheonixsolutions.com\/knowledge-base\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pheonixsolutions.com\/knowledge-base\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/pheonixsolutions.com\/knowledge-base\/wp-json\/wp\/v2\/comments?post=3608"}],"version-history":[{"count":2,"href":"https:\/\/pheonixsolutions.com\/knowledge-base\/wp-json\/wp\/v2\/posts\/3608\/revisions"}],"predecessor-version":[{"id":3610,"href":"https:\/\/pheonixsolutions.com\/knowledge-base\/wp-json\/wp\/v2\/posts\/3608\/revisions\/3610"}],"wp:attachment":[{"href":"https:\/\/pheonixsolutions.com\/knowledge-base\/wp-json\/wp\/v2\/media?parent=3608"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pheonixsolutions.com\/knowledge-base\/wp-json\/wp\/v2\/categories?post=3608"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pheonixsolutions.com\/knowledge-base\/wp-json\/wp\/v2\/tags?post=3608"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}