{"id":2066,"date":"2025-12-15T20:03:50","date_gmt":"2025-12-15T23:03:50","guid":{"rendered":"https:\/\/helpsysadmin.com.br\/blog\/?p=2066"},"modified":"2025-12-15T20:07:19","modified_gmt":"2025-12-15T23:07:19","slug":"ovh-firewall-configuration","status":"publish","type":"post","link":"https:\/\/helpsysadmin.com.br\/blog\/en\/ovh-firewall-configuration\/","title":{"rendered":"OVH Firewall Configuration"},"content":{"rendered":"<div id=\"helps-3010944509\" class=\"helps-before-content-2 helps-entity-placement\"><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-3661896953164277\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- 2anuncios display quadrado -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-client=\"ca-pub-3661896953164277\"\r\n     data-ad-slot=\"5051229894\"\r\n     data-ad-format=\"auto\"\r\n     data-full-width-responsive=\"true\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n<p>OVH Firewall configuration is an excellent additional security layer to your server&#8217;s internal firewall (such as iptables, ufw, or firewalld). It blocks unwanted traffic before it even reaches your server&#8217;s network interface, saving CPU resources and bandwidth.<\/p>\n\n\n\n<p>Here&#8217;s a step-by-step guide to configuring the OVH Network Firewall, focused on avoiding common mistakes (such as blocking your own access).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-understanding-the-logic-before-you-begin\">1. Understanding the Logic (Before You Begin)<\/h3>\n\n\n\n<p>The OVH Firewall works with numbered Priority rules (0 to 19).<\/p>\n\n\n\n<p><strong>Rule 0:<\/strong> This is the first to be read.<\/p>\n\n\n\n<p><strong>Rule 19:<\/strong> This is the last to be read.<\/p>\n\n\n\n<p>As soon as a data packet matches a rule, the action (Allow or Reject) is taken and the reading stops.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-accessing-the-dashboard\">2. Accessing the Dashboard<\/h3>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Log in to OVH Manager.<\/li>\n\n\n\n<li>In the top menu, go to Bare Metal Cloud.<\/li>\n\n\n\n<li>In the left-hand menu, click on Network and then on IP.<\/li>\n\n\n\n<li>Locate your server&#8217;s IP address in the list.<\/li>\n\n\n\n<li>Click on the \u2026 (three dots) next to the IP address and select Create Firewall (if it doesn&#8217;t already exist) or Configure Firewall.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-enabling-the-firewall\">3. Enabling the Firewall<\/h3>\n\n\n\n<p>Before creating rules, you must enable mitigation mode:<\/p>\n\n\n\n<p>In the IP address, click Enable Firewall.<br>The shield icon will turn green or the status will show &#8220;Enabled&#8221;.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-4-creating-the-rules-step-by-step\">4. Creating the Rules (Step by Step)<\/h3>\n\n\n\n<p>To add rules, click the IP address (\u2026) and select Configure Firewall. You will see an empty table. Click Add a rule.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-rule-a-allow-ssh-crucial\">Rule A: Allow SSH (CRUCIAL)<\/h4>\n\n\n\n<p>Do this first to avoid locking yourself out.<br><strong>Priority:<\/strong> 0<br><strong>Action:<\/strong> Authorize<br><strong>Protocol:<\/strong> TCP<br><strong>Source IP:<\/strong> Leave blank (to allow access to everyone) or enter only your static internet IP address (for maximum security).<br><strong>Source Port:<\/strong> Leave blank.<br><strong>Destination Port:<\/strong> 22 (or your custom SSH port).<br><strong>Status:<\/strong> New or leave blank.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-rule-b-allow-web-http-https-and-control-panels\">Rule B: Allow Web (HTTP\/HTTPS) and Control Panels<\/h4>\n\n\n\n<p>If you host websites or use cPanel\/DirectAdmin\/Plesk.<br><strong>Priority:<\/strong> 1<br><strong>Action:<\/strong> Allow<br><strong>Protocol:<\/strong> TCP<br><strong>Destination Port:<\/strong> 80 (HTTP)<br><strong>Priority:<\/strong> 2<br><strong>Action:<\/strong> Allow<br><strong>Protocol:<\/strong> TCP<br><strong>Destination Port:<\/strong> 443 (HTTPS)<\/p>\n\n\n\n<p>(Repeat the process for other ports or control panel ports such as 2222, 2083, 2087, 8080, if necessary).<\/p>\n\n\n\n<p id=\"h-regra-c-permitir-conexoes-estabelecidas-tcp-established\"><\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-rule-c-allow-established-connections-tcp-established\">Rule C: Allow established connections (TCP Established)<\/h4>\n\n\n\n<p>Allow established connections (TCP Established)<br>This is vital. If your server attempts to download an update (apt\/yum) or respond to a ping, it needs to receive the response back.<\/p>\n\n\n\n<p id=\"h-regra-c-permitir-conexoes-estabelecidas-tcp-established\"><strong>Priority:<\/strong> 10<br><strong>Action:<\/strong> Allow<br><strong>Protocol:<\/strong> TCP<br><strong>TCP Options:<\/strong> Select Established.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-rule-d-block-everything-else-the-wall\">Rule D: Block everything else (The &#8220;Wall&#8221;)<\/h4>\n\n\n\n<p>This should always be your last rule.<br><strong>Priority:<\/strong> 19<br><strong>Action:<\/strong> Reject<br><strong>Protocol:<\/strong> IPv4 (This selects all protocols: TCP, UDP, ICMP, etc.)<br><strong>Source\/Destination IP:<\/strong> Leave blank.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-this-should-always-be-your-last-rule\">This should always be your last rule.<\/h4>\n\n\n\n<p><strong>Priority:<\/strong> 19<br><strong>Action:<\/strong> Reject<br><strong>Protocol:<\/strong> IPv4 (This selects all protocols: TCP, UDP, ICMP, etc.)<br><strong>Source\/Destination IP:<\/strong> Leave blank.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-5-example-of-a-final-table\">5. Example of a Final Table<\/h3>\n\n\n\n<p id=\"h-5-example-of-a-final-table\">Your table in the OVH dashboard should look something like this for a basic web server:<br><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Priority<\/strong><\/td><td><strong>Action<\/strong><\/td><td><strong>Protocol<\/strong><\/td><td><strong>Destination Port <\/strong><\/td><td><strong>Notes<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>0<\/strong><\/td><td>Authorize<\/td><td>TCP<\/td><td>22<\/td><td>SSH access<\/td><\/tr><tr><td><strong>1<\/strong><\/td><td>Authorize<\/td><td>TCP<\/td><td>80<\/td><td>Web HTTP<\/td><\/tr><tr><td><strong>2<\/strong><\/td><td>Authorize<\/td><td>TCP<\/td><td>443<\/td><td>Web HTTPS<\/td><\/tr><tr><td><strong>3<\/strong><\/td><td>Authorize<\/td><td>UDP<\/td><td>53<\/td><td>DNS (If it&#8217;s a DNS server)<\/td><\/tr><tr><td><strong>10<\/strong><\/td><td>Authorize<\/td><td>TCP<\/td><td>&#8211;<\/td><td>Option: Established (Answers)<\/td><\/tr><tr><td><strong>11<\/strong><\/td><td>Authorize<\/td><td>ICMP<\/td><td>&#8211;<\/td><td>Allow Ping (Optional)<\/td><\/tr><tr><td><strong>19<\/strong><\/td><td><strong>Refuse<\/strong><\/td><td><strong>IPv4<\/strong><\/td><td>&#8211;<\/td><td>Block everything else.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-important-tips-and-warnings\">Important Tips and Warnings<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>UDP: <\/strong>If you use games or VPNs (OpenVPN\/Wireguard) that use UDP, remember to create Authorize rules with UDP protocol on the specific ports before rule 19.<\/li>\n\n\n\n<li><strong>Application Delay:<\/strong> Rules on OVH can take 30 seconds to 2 minutes to propagate.<\/li>\n\n\n\n<li><strong>Local Firewall: <\/strong>Never disable your local firewall (iptables\/ufw). The OVH firewall is edge protection; the local one is your last line of defense and allows for finer controls (such as blocking login attempts).<\/li>\n\n\n\n<li><strong>Permanent Mitigation:<\/strong> By default, OVH only activates these rules if it detects an attack. For these rules to always work, go to the IP settings and change the mitigation mode from &#8220;Automatic&#8221; to &#8220;Permanent Mitigation&#8221;.<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>OVH Firewall configuration is an excellent additional security layer to your server&#8217;s internal firewall (such as iptables, ufw, or firewalld). It blocks [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":2064,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1206,1209,1204],"tags":[1211,1243,1980],"class_list":["post-2066","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux","category-security","category-server-management","tag-linux-en","tag-seguranca","tag-server-linux-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.5 (Yoast SEO v27.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>OVH Firewall Configuration - Blog HelpSysAdmin<\/title>\n<meta name=\"description\" content=\"OVH Firewall configuration is an excellent additional security layer to your server&#039;s internal firewall\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/helpsysadmin.com.br\/blog\/en\/ovh-firewall-configuration\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"OVH Firewall Configuration\" \/>\n<meta property=\"og:description\" content=\"OVH Firewall configuration is an excellent additional security layer to your server&#039;s internal firewall\" \/>\n<meta property=\"og:url\" content=\"https:\/\/helpsysadmin.com.br\/blog\/en\/ovh-firewall-configuration\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog HelpSysAdmin\" \/>\n<meta property=\"article:published_time\" content=\"2025-12-15T23:03:50+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-12-15T23:07:19+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/mlkpd8g42nae.i.optimole.com\/w:auto\/h:auto\/q:mauto\/f:best\/https:\/\/helpsysadmin.com.br\/blog\/wp-content\/uploads\/2025\/12\/ovhcloud.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1120\" \/>\n\t<meta property=\"og:image:height\" content=\"315\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"HelpSysAdmin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@brhelpsysad\" \/>\n<meta name=\"twitter:site\" content=\"@brhelpsysad\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/helpsysadmin.com.br\\\/blog\\\/en\\\/ovh-firewall-configuration\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/helpsysadmin.com.br\\\/blog\\\/en\\\/ovh-firewall-configuration\\\/\"},\"author\":{\"name\":\"HelpSysAdmin\",\"@id\":\"https:\\\/\\\/helpsysadmin.com.br\\\/blog\\\/#\\\/schema\\\/person\\\/bdbe3d7d71a0c6a3cb474c18da574efb\"},\"headline\":\"OVH Firewall Configuration\",\"datePublished\":\"2025-12-15T23:03:50+00:00\",\"dateModified\":\"2025-12-15T23:07:19+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/helpsysadmin.com.br\\\/blog\\\/en\\\/ovh-firewall-configuration\\\/\"},\"wordCount\":614,\"publisher\":{\"@id\":\"https:\\\/\\\/helpsysadmin.com.br\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/helpsysadmin.com.br\\\/blog\\\/en\\\/ovh-firewall-configuration\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\/\\/helpsysadmin.com.br\\/blog\\/wp-content\\/uploads\\/2025\\/12\\/ovhcloud.png\",\"keywords\":[\"linux\",\"seguran\u00e7a\",\"server linux\"],\"articleSection\":[\"Linux\",\"Security\",\"server management\"],\"inLanguage\":\"pt-BR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/helpsysadmin.com.br\\\/blog\\\/en\\\/ovh-firewall-configuration\\\/\",\"url\":\"https:\\\/\\\/helpsysadmin.com.br\\\/blog\\\/en\\\/ovh-firewall-configuration\\\/\",\"name\":\"OVH Firewall Configuration - 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