{"id":4044,"date":"2026-08-31T08:48:11","date_gmt":"2026-08-31T08:48:11","guid":{"rendered":"https:\/\/pheonixsolutions.com\/knowledge-base\/?p=4044"},"modified":"2026-08-31T08:48:14","modified_gmt":"2026-08-31T08:48:14","slug":"shell-fork-bomb-protection-in-whm","status":"publish","type":"post","link":"https:\/\/pheonixsolutions.com\/knowledge-base\/2026\/08\/31\/shell-fork-bomb-protection-in-whm\/","title":{"rendered":"Shell Fork Bomb Protection in WHM"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Introduction<\/h2>\n\n\n\n<p>Shell Fork Bomb Protection is a security feature in WHM that helps protect the server from fork bombs.<\/p>\n\n\n\n<p>A fork bomb creates a large number of processes continuously, which can consume the server&#8217;s available resources. This feature helps prevent users with <strong>SSH or Telnet access<\/strong> from exhausting server resources.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Prerequisites<\/h2>\n\n\n\n<p>Before enabling Shell Fork Bomb Protection:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Root access to WHM is required.<\/li>\n\n\n\n<li>The server should provide terminal access such as SSH or Telnet.<\/li>\n\n\n\n<li>Ensure that applications running on the server can work with the configured resource limits.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Implementation<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Step 1: Access Shell Fork Bomb Protection<\/h3>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Log in to <strong>WHM<\/strong> as the root user.<\/li>\n\n\n\n<li>Navigate to <strong>Security Center \u2192 Shell Fork Bomb Protection<\/strong>.<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"331\" src=\"https:\/\/pheonixsolutions.com\/knowledge-base\/wp-content\/uploads\/2026\/08\/Screenshot-2026-08-27-122137-1024x331.png\" alt=\"\" class=\"wp-image-4049\" srcset=\"https:\/\/pheonixsolutions.com\/knowledge-base\/wp-content\/uploads\/2026\/08\/Screenshot-2026-08-27-122137-1024x331.png 1024w, https:\/\/pheonixsolutions.com\/knowledge-base\/wp-content\/uploads\/2026\/08\/Screenshot-2026-08-27-122137-300x97.png 300w, https:\/\/pheonixsolutions.com\/knowledge-base\/wp-content\/uploads\/2026\/08\/Screenshot-2026-08-27-122137-768x248.png 768w, https:\/\/pheonixsolutions.com\/knowledge-base\/wp-content\/uploads\/2026\/08\/Screenshot-2026-08-27-122137-1536x496.png 1536w, https:\/\/pheonixsolutions.com\/knowledge-base\/wp-content\/uploads\/2026\/08\/Screenshot-2026-08-27-122137-150x48.png 150w, https:\/\/pheonixsolutions.com\/knowledge-base\/wp-content\/uploads\/2026\/08\/Screenshot-2026-08-27-122137.png 1598w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Step 2: Enable Protection<\/h3>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Check the current protection status.<\/li>\n\n\n\n<li>Click <strong>Enable Protection<\/strong>.<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"606\" height=\"148\" src=\"https:\/\/pheonixsolutions.com\/knowledge-base\/wp-content\/uploads\/2026\/08\/Screenshot-2026-08-27-122218.png\" alt=\"\" class=\"wp-image-4050\" srcset=\"https:\/\/pheonixsolutions.com\/knowledge-base\/wp-content\/uploads\/2026\/08\/Screenshot-2026-08-27-122218.png 606w, https:\/\/pheonixsolutions.com\/knowledge-base\/wp-content\/uploads\/2026\/08\/Screenshot-2026-08-27-122218-300x73.png 300w, https:\/\/pheonixsolutions.com\/knowledge-base\/wp-content\/uploads\/2026\/08\/Screenshot-2026-08-27-122218-150x37.png 150w\" sizes=\"auto, (max-width: 606px) 100vw, 606px\" \/><\/figure>\n\n\n\n<p>    3. WHM applies the required <code>ulimit<\/code> resource restrictions.<\/p>\n\n\n\n<p>The default resource limits include:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Option<\/th><th>Limit<\/th><th>Description<\/th><\/tr><tr><td><code>-c<\/code><\/td><td>200000<\/td><td>Core file size<\/td><\/tr><tr><td><code>-d<\/code><\/td><td>200000<\/td><td>Process data segment<\/td><\/tr><tr><td><code>-m<\/code><\/td><td>200000<\/td><td>Resident set size<\/td><\/tr><tr><td><code>-n<\/code><\/td><td>100<\/td><td>Open-file descriptors<\/td><\/tr><tr><td><code>-s<\/code><\/td><td>8192<\/td><td>Stack size<\/td><\/tr><tr><td><code>-u<\/code><\/td><td>35<\/td><td>Maximum processes per user<\/td><\/tr><tr><td><code>-v<\/code><\/td><td>Unlimited<\/td><td>Virtual memory<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Note:<\/strong> The <code>-u<\/code> limit restricts cPanel users with Bash shell access to 35 processes per user.<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">Step 3: Verify the Protection<\/h3>\n\n\n\n<p>After enabling the feature, verify that the status is displayed as <strong>Enabled<\/strong> in the Shell Fork Bomb Protection interface.<\/p>\n\n\n\n<p>To disable the protection, return to the same interface and click <strong>Disable Protection<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>Shell Fork Bomb Protection helps improve server security and stability by limiting the resources that users can consume through excessive process creation. It is recommended for servers that provide terminal access to users.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">FAQs<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. What is a fork bomb?<\/h3>\n\n\n\n<p>A fork bomb is a process that continuously creates new processes until the server&#8217;s available resources are exhausted.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Where can I find Shell Fork bomb protection?<\/h3>\n\n\n\n<p>You can find it under <strong>WHM \u2192 Security Center \u2192 Shell Fork Bomb Protection<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. What happens when protection is enabled?<\/h3>\n\n\n\n<p>WHM applies <code>ulimit<\/code> restrictions to control the resources available to users.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. How many processes can a cPanel user create?<\/h3>\n\n\n\n<p>By default, cPanel users with Bash shell access are limited to <strong>35 processes per user<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5. Can I disable shell fork bomb protection?<\/h3>\n\n\n\n<p>Yes. You can disable it from the same <strong>Shell Fork Bomb Protection<\/strong> interface in WHM.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Related Articles<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><a href=\"https:\/\/pheonixsolutions.com\/knowledge-base\/2021\/03\/16\/how-to-enable-shell-accessssh-for-cpanel-account-in-whm\/?utm_source=chatgpt.com\">How to enable shell access (SSH) for cPanel account in WHM<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/pheonixsolutions.com\/knowledge-base\/2024\/07\/23\/how-to-create-db-user-and-password-and-give-privileges-in-cpanel-using-uapi-in-terminal\/?utm_source=chatgpt.com\">How to create DB, user and password and give privileges in cPanel using UAPI in terminal<\/a><\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-embed is-type-wp-embed is-provider-pheonixsolutions-knowledge-base wp-block-embed-pheonixsolutions-knowledge-base\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"EYQbbHoSKF\"><a href=\"https:\/\/pheonixsolutions.com\/knowledge-base\/2021\/03\/16\/how-to-enable-shell-accessssh-for-cpanel-account-in-whm\/\">How to enable shell access(SSH) for cPanel account in WHM<\/a><\/blockquote><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"&#8220;How to enable shell access(SSH) for cPanel account in WHM&#8221; &#8212; PheonixSolutions Knowledge-Base\" src=\"https:\/\/pheonixsolutions.com\/knowledge-base\/2021\/03\/16\/how-to-enable-shell-accessssh-for-cpanel-account-in-whm\/embed\/#?secret=er46WNLW2d#?secret=EYQbbHoSKF\" data-secret=\"EYQbbHoSKF\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe>\n<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Introduction Shell Fork Bomb Protection is a security feature in WHM that helps protect the server from fork bombs. A fork bomb creates a large number of processes continuously, which can consume the server&#8217;s available resources. This feature helps prevent users with SSH or Telnet access from exhausting server resources. Prerequisites Before enabling Shell Fork ..<\/p>\n<div class=\"clear-fix\"><\/div>\n<p><a href=\"https:\/\/pheonixsolutions.com\/knowledge-base\/2026\/08\/31\/shell-fork-bomb-protection-in-whm\/\" title=\"read more...\">Read more<\/a><\/p>\n","protected":false},"author":19,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[33],"tags":[],"class_list":["post-4044","post","type-post","status-publish","format-standard","hentry","category-whm"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Shell Fork Bomb Protection in WHM - 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\/08\/31\/shell-fork-bomb-protection-in-whm\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Shell Fork Bomb Protection in WHM - PheonixSolutions Knowledge-Base\" \/>\n<meta property=\"og:description\" content=\"Introduction Shell Fork Bomb Protection is a security feature in WHM that helps protect the server from fork bombs. 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A fork bomb creates a large number of processes continuously, which can consume the server&#8217;s available resources. This feature helps prevent users with SSH or Telnet access from exhausting server resources. 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