{"id":18861,"date":"2026-02-28T20:58:04","date_gmt":"2026-02-28T20:58:04","guid":{"rendered":"https:\/\/www.truehost.com\/support\/?p=18861"},"modified":"2026-03-09T10:34:14","modified_gmt":"2026-03-09T10:34:14","slug":"how-to-enable-ports-whitelist-and-blacklist-ips-in-csf-firewall-configserver-security-firewall","status":"publish","type":"post","link":"https:\/\/www.truehost.com\/support\/how-to-enable-ports-whitelist-and-blacklist-ips-in-csf-firewall-configserver-security-firewall\/","title":{"rendered":"How to Enable Ports, Whitelist, and Blacklist IPs in CSF Firewall (ConfigServer Security &amp; Firewall)"},"content":{"rendered":"\n<p>ConfigServer Security &amp; Firewall (CSF) is a powerful firewall used on Linux servers, especially in cPanel\/WHM environments. This guide explains how to open ports, whitelist trusted IPs, and block malicious IP addresses.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Part 1: How to Enable Ports in CSF Firewall<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Step 1: Connect to Your Server via SSH<\/h2>\n\n\n\n<p>Login to your server as root:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ssh root@your-server-ip\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 2: Open the CSF Configuration File<\/h2>\n\n\n\n<p>Edit the CSF configuration file:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>nano \/etc\/csf\/csf.conf\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 3: Allow Incoming Ports (TCP_IN)<\/h2>\n\n\n\n<p>Find the line:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>TCP_IN =\n<\/code><\/pre>\n\n\n\n<p>Example default:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>TCP_IN = \"20,21,22,25,53,80,110,143,443,465,587,993,995,2083,2087\"\n<\/code><\/pre>\n\n\n\n<p>To allow a new port (example: 3000):<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>TCP_IN = \"20,21,22,25,53,80,110,143,443,465,587,993,995,2083,2087,3000\"\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 4: Allow Outgoing Ports (TCP_OUT)<\/h2>\n\n\n\n<p>Find:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>TCP_OUT =\n<\/code><\/pre>\n\n\n\n<p>Example:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>TCP_OUT = \"20,21,22,25,53,80,110,113,443\"\n<\/code><\/pre>\n\n\n\n<p>Add your port:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>TCP_OUT = \"20,21,22,25,53,80,110,113,443,3000\"\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 5: Allow UDP Ports (if required)<\/h2>\n\n\n\n<p>Edit:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>UDP_IN =\nUDP_OUT =\n<\/code><\/pre>\n\n\n\n<p>Example:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>UDP_IN = \"53\"\nUDP_OUT = \"53\"\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 6: Restart CSF to Apply Changes<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>csf -r\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Part 2: How to Whitelist an IP Address<\/h1>\n\n\n\n<p>Whitelisting allows a trusted IP to bypass firewall restrictions and prevents it from being blocked.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Method 1: Using Command Line (Recommended)<\/h2>\n\n\n\n<p>Whitelist an IP:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>csf -a 192.168.1.10\n<\/code><\/pre>\n\n\n\n<p>Example output:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Adding 192.168.1.10 to csf.allow and iptables ACCEPT...\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Method 2: Whitelist IP for Specific Port<\/h2>\n\n\n\n<p>Example: allow IP access to port 22 (SSH)<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>csf -a 192.168.1.10 tcp:22\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Method 3: Manually Edit csf.allow File<\/h2>\n\n\n\n<p>Open whitelist file:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>nano \/etc\/csf\/csf.allow\n<\/code><\/pre>\n\n\n\n<p>Add IP:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>192.168.1.10\n<\/code><\/pre>\n\n\n\n<p>Save and restart CSF:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>csf -r\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Part 3: How to Blacklist (Block) an IP Address<\/h1>\n\n\n\n<p>Blacklisting blocks an IP from accessing your server.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Method 1: Using Command Line (Recommended)<\/h2>\n\n\n\n<p>Block IP:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>csf -d 192.168.1.10\n<\/code><\/pre>\n\n\n\n<p>This immediately blocks the IP.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Method 2: Manually Edit csf.deny File<\/h2>\n\n\n\n<p>Open blacklist file:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>nano \/etc\/csf\/csf.deny\n<\/code><\/pre>\n\n\n\n<p>Add IP:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>192.168.1.10\n<\/code><\/pre>\n\n\n\n<p>Restart firewall:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>csf -r\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Part 4: Remove IP from Whitelist or Blacklist<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Remove from whitelist:<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>csf -ar 192.168.1.10\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Remove from blacklist:<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>csf -dr 192.168.1.10\n<\/code><\/pre>\n\n\n\n<p>Restart CSF:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>csf -r\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Part 5: Verify IP Status<\/h1>\n\n\n\n<p>Check if IP is allowed or blocked:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>csf -g 192.168.1.10\n<\/code><\/pre>\n\n\n\n<p>This will show whether the IP is in allow or deny list.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Part 6: Common CSF Files Reference<\/h1>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>File<\/th><th>Purpose<\/th><\/tr><\/thead><tbody><tr><td>\/etc\/csf\/csf.conf<\/td><td>Main firewall configuration<\/td><\/tr><tr><td>\/etc\/csf\/csf.allow<\/td><td>Whitelisted IP addresses<\/td><\/tr><tr><td>\/etc\/csf\/csf.deny<\/td><td>Blocked IP addresses<\/td><\/tr><tr><td>\/etc\/csf\/csf.ignore<\/td><td>Ignored by login failure daemon<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Part 7: Common Ports Reference<\/h1>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Service<\/th><th>Port<\/th><\/tr><\/thead><tbody><tr><td>SSH<\/td><td>22<\/td><\/tr><tr><td>HTTP<\/td><td>80<\/td><\/tr><tr><td>HTTPS<\/td><td>443<\/td><\/tr><tr><td>FTP<\/td><td>21<\/td><\/tr><tr><td>cPanel<\/td><td>2083<\/td><\/tr><tr><td>WHM<\/td><td>2087<\/td><\/tr><tr><td>MySQL<\/td><td>3306<\/td><\/tr><tr><td>Node.js<\/td><td>3000<\/td><\/tr><tr><td>Redis<\/td><td>6379<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Security Best Practices<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Only open ports required by your applications<\/li>\n\n\n\n<li>Always whitelist your own IP to prevent lockout<\/li>\n\n\n\n<li>Block suspicious or malicious IPs immediately<\/li>\n\n\n\n<li>Regularly monitor firewall logs<\/li>\n\n\n\n<li>Restart CSF after any configuration change<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Restart CSF Firewall<\/h1>\n\n\n\n<pre class=\"wp-block-code\"><code>csf -r\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>By following this guide, you can safely manage ports, allow trusted users, and block malicious traffic using the CSF firewall.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>ConfigServer Security &amp; Firewall (CSF) is a powerful firewall used on Linux servers, especially in cPanel\/WHM environments. This guide explains how to open ports, whitelist trusted IPs, and block malicious IP addresses. Part 1: How to Enable Ports in CSF Firewall Step 1: Connect to Your Server via SSH Login to your server as root: [&hellip;]<\/p>\n","protected":false},"author":26,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[1,381,672],"tags":[2144,2143],"class_list":["post-18861","post","type-post","status-publish","format-standard","hentry","category-guides","category-security","category-tcloud-vps","tag-security","tag-server"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Enable Ports, Whitelist, and Blacklist IPs in CSF Firewall (ConfigServer Security &amp; Firewall) -<\/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:\/\/truehost.com\/support\/how-to-enable-ports-whitelist-and-blacklist-ips-in-csf-firewall-configserver-security-firewall\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Enable Ports, Whitelist, and Blacklist IPs in CSF Firewall (ConfigServer Security &amp; Firewall) -\" \/>\n<meta property=\"og:description\" content=\"ConfigServer Security &amp; Firewall (CSF) is a powerful firewall used on Linux servers, especially in cPanel\/WHM environments. 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