{"id":12081,"date":"2026-07-13T08:43:41","date_gmt":"2026-07-13T06:43:41","guid":{"rendered":"https:\/\/mybox.com\/help\/?post_type=manual_kb&#038;p=12081"},"modified":"2026-07-13T08:43:45","modified_gmt":"2026-07-13T06:43:45","slug":"why-wordpress-site-health-reports-a-failed-loopback-request","status":"publish","type":"manual_kb","link":"https:\/\/mybox.com\/help\/en\/knowledgebase\/why-wordpress-site-health-reports-a-failed-loopback-request\/","title":{"rendered":"Why WordPress Site Health reports a failed loopback request"},"content":{"rendered":"\n<div class=\"translation-block translation-block-merged\">\n<p class=\"wp-block-paragraph\">WordPress Site Health may display a message indicating that a loopback request has failed. This warning appears when WordPress cannot send a request to its own website and receive a response.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Loopback requests are used for background tasks such as scheduled posts, automatic updates, plugin and theme management, and some maintenance operations. A failed loopback request does not always mean that your website is unavailable, but it can prevent certain WordPress features from working correctly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/why-wordpress-site-health-reports-a-failed-loopback-request\/#What_is_a_loopback_request\" >What is a loopback request?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/why-wordpress-site-health-reports-a-failed-loopback-request\/#Common_causes\" >Common causes<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/why-wordpress-site-health-reports-a-failed-loopback-request\/#A_plugin_or_theme_is_blocking_the_request\" >A plugin or theme is blocking the request<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/why-wordpress-site-health-reports-a-failed-loopback-request\/#Password_protection_or_access_restrictions\" >Password protection or access restrictions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/why-wordpress-site-health-reports-a-failed-loopback-request\/#DNS_or_domain_configuration_issues\" >DNS or domain configuration issues<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/why-wordpress-site-health-reports-a-failed-loopback-request\/#A_firewall_or_security_system_is_blocking_internal_traffic\" >A firewall or security system is blocking internal traffic<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/why-wordpress-site-health-reports-a-failed-loopback-request\/#Server_timeouts_or_resource_limits\" >Server timeouts or resource limits<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/why-wordpress-site-health-reports-a-failed-loopback-request\/#How_to_investigate_the_issue\" >How to investigate the issue<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/why-wordpress-site-health-reports-a-failed-loopback-request\/#How_serious_is_this_warning\" >How serious is this warning?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/why-wordpress-site-health-reports-a-failed-loopback-request\/#What_to_expect\" >What to expect<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_a_loopback_request\"><\/span>What is a loopback request?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<\/div>\n\n<div id=\"mybox-2335551026\" class=\"mybox-content mybox-entity-placement\"><div class=\"early-access-banner-inpost\">\r\n  <div class=\"banner-left-inpost\">\r\n    <div class=\"icon-box-inpost\">\r\n      <img decoding=\"async\" src=\"https:\/\/mybox.com\/help\/wp-content\/uploads\/2026\/02\/square-info-icon.svg\" alt=\"Info\">\r\n    <\/div>\r\n    <div class=\"text-box-inpost\">\r\n      <span class=\"label-inpost\"><span class=\"translation-block translation-block-banner-text\">Early access<\/span><\/span>\r\n      <h4><span class=\"translation-block translation-block-banner-text\">Still need help?<\/span><\/h4>\r\n      <p><span class=\"translation-block translation-block-banner-text\">Contact our customer service team.<\/span><\/p>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"banner-right-inpost\">\r\n    <a href=\"https:\/\/panel.mybox.com\/helpdesk2\/v\/list\/\" class=\"banner-button-inpost\"><span class=\"translation-block translation-block-banner-text\">Message us<\/span><\/a>\r\n  <\/div>\r\n<\/div><\/div>\n\n<div class=\"translation-block translation-block-merged\"><p class=\"wp-block-paragraph\">A loopback request occurs when WordPress contacts its own domain from the server on which it is hosted.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example, WordPress uses loopback requests to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Run scheduled tasks through WP-Cron.<\/li>\n\n\n\n<li>Publish scheduled posts.<\/li>\n\n\n\n<li>Perform plugin and theme updates.<\/li>\n\n\n\n<li>Execute background maintenance tasks.<\/li>\n\n\n\n<li>Check whether the website can process internal requests.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Visitors accessing your website are not affected by these requests directly, but WordPress relies on them to perform many automated operations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_causes\"><\/span>Common causes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"A_plugin_or_theme_is_blocking_the_request\"><\/span>A plugin or theme is blocking the request<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Security, caching, or performance plugins can sometimes interfere with loopback requests.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the problem appeared after installing or updating a plugin or theme, temporarily disable it and check whether the Site Health warning disappears.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Password_protection_or_access_restrictions\"><\/span>Password protection or access restrictions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Loopback requests may fail if the website is protected by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>HTTP authentication.<\/li>\n\n\n\n<li>IP restrictions.<\/li>\n\n\n\n<li>Firewall rules.<\/li>\n\n\n\n<li>Maintenance mode plugins.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These restrictions can prevent WordPress from reaching its own pages.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"DNS_or_domain_configuration_issues\"><\/span>DNS or domain configuration issues<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">WordPress uses your domain name when making loopback requests. If the domain points to the wrong server or DNS changes are still propagating, internal requests may fail.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This can happen after:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Migrating a website.<\/li>\n\n\n\n<li>Changing nameservers.<\/li>\n\n\n\n<li>Updating DNS records.<\/li>\n\n\n\n<li>Moving WordPress to a different hosting environment.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"A_firewall_or_security_system_is_blocking_internal_traffic\"><\/span>A firewall or security system is blocking internal traffic<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Some security systems inspect requests sent from the server to the website itself. In certain cases, these requests may be blocked or rate-limited.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If your website uses external security services or custom firewall rules, review their configuration.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Server_timeouts_or_resource_limits\"><\/span>Server timeouts or resource limits<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Loopback requests may also fail if the website takes too long to respond or if server resources are exhausted.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">High CPU usage, insufficient memory, or slow database queries can cause WordPress to interrupt internal requests before they complete.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_investigate_the_issue\"><\/span>How to investigate the issue<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If WordPress reports a failed loopback request, try the following:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Open <strong>Tools \u2192 Site Health<\/strong> in the WordPress administration panel.<\/li>\n\n\n\n<li>Review the full error message displayed by WordPress.<\/li>\n\n\n\n<li>Temporarily disable recently installed plugins.<\/li>\n\n\n\n<li>Switch to a default WordPress theme to rule out theme-related issues.<\/li>\n\n\n\n<li>Confirm that your domain points to the correct hosting environment.<\/li>\n\n\n\n<li>Check whether the website is protected by additional authentication or firewall rules.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">If the problem started after a migration or DNS change, wait until the new configuration has fully propagated.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_serious_is_this_warning\"><\/span>How serious is this warning?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A failed loopback request does not always indicate that the website is broken. Many websites continue to load normally for visitors even when WordPress reports this warning.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, you may notice problems such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Scheduled posts are not published.<\/li>\n\n\n\n<li>Automatic updates do not complete.<\/li>\n\n\n\n<li>Background tasks stop running.<\/li>\n\n\n\n<li>Site Health reports additional warnings.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If these symptoms appear together, further investigation may be necessary.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_to_expect\"><\/span>What to expect<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The exact cause of a failed loopback request varies from one website to another. In many cases, the issue is related to plugins, security settings, or recent changes to the hosting environment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the warning persists, support may ask for the complete Site Health message, a list of active plugins, and details about any recent changes to the website or DNS configuration.<\/p>\n<\/div>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"template":"","format":"standard","manualknowledgebasecat":[58],"manual_kb_tag":[],"class_list":["post-12081","manual_kb","type-manual_kb","status-publish","format-standard","hentry","manualknowledgebasecat-web-applications-cms"],"_links":{"self":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb\/12081","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb"}],"about":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/types\/manual_kb"}],"author":[{"embeddable":true,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/users\/1"}],"version-history":[{"count":1,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb\/12081\/revisions"}],"predecessor-version":[{"id":12082,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb\/12081\/revisions\/12082"}],"wp:attachment":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/media?parent=12081"}],"wp:term":[{"taxonomy":"manualknowledgebasecat","embeddable":true,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manualknowledgebasecat?post=12081"},{"taxonomy":"manual_kb_tag","embeddable":true,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb_tag?post=12081"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}