{"id":96690,"date":"2025-10-09T22:02:55","date_gmt":"2025-10-09T16:32:55","guid":{"rendered":"https:\/\/www.seminarsonly.com\/news\/?p=96690"},"modified":"2025-10-09T22:13:46","modified_gmt":"2025-10-09T16:43:46","slug":"how-to-fix-error-54113-varnish-cache-server","status":"publish","type":"post","link":"https:\/\/seminarsonly.com\/news\/how-to-fix-error-54113-varnish-cache-server\/","title":{"rendered":"How To Fix Error 54113 Varnish Cache Server"},"content":{"rendered":"<h3 data-start=\"0\" data-end=\"300\"><span style=\"color: #008000;\"><em>The <strong data-start=\"4\" data-end=\"47\">Error 54113 from a Varnish Cache Server<\/strong> is typically a <strong data-start=\"63\" data-end=\"91\">backend connection error<\/strong>, which means <strong data-start=\"105\" data-end=\"160\">Varnish couldn\u2019t reach your origin server (backend)<\/strong> or received an invalid response.<\/em> <\/span><\/h3>\n<p data-start=\"0\" data-end=\"300\">It&#8217;s often associated with <strong data-start=\"221\" data-end=\"253\">HTTP 503 Service Unavailable<\/strong> errors but is more specific to Varnish setups.<\/p>\n<hr data-start=\"302\" data-end=\"305\" \/>\n<h2 data-start=\"307\" data-end=\"344\"><span style=\"color: #800000;\">\ud83e\udde0 What Is Error 54113 in Varnish?<\/span><\/h2>\n<ul data-start=\"346\" data-end=\"610\">\n<li data-start=\"346\" data-end=\"530\">\n<p data-start=\"348\" data-end=\"378\"><strong data-start=\"348\" data-end=\"371\">Varnish Error 54113<\/strong> means:<\/p>\n<blockquote data-start=\"381\" data-end=\"530\">\n<p data-start=\"383\" data-end=\"530\">Varnish tried to fetch content from the backend (your web server like Apache, NGINX, etc.) but failed, so it couldn\u2019t serve anything to the client.<\/p>\n<\/blockquote>\n<\/li>\n<li data-start=\"532\" data-end=\"610\">\n<p data-start=\"534\" data-end=\"561\">You might see this message:<\/p>\n<div class=\"contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary\">\n<div class=\"sticky top-9\">\n<div class=\"absolute end-0 bottom-0 flex h-9 items-center pe-2\">\n<div class=\"bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs\"><\/div>\n<\/div>\n<\/div>\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"whitespace-pre!\"><span class=\"hljs-title class_\">Error<\/span> <span class=\"hljs-number\">54113<\/span><br \/>\n<span class=\"hljs-title class_\">Varnish<\/span> cache server<br \/>\n<\/code><\/div>\n<\/div>\n<\/li>\n<\/ul>\n<hr data-start=\"612\" data-end=\"615\" \/>\n<h2 data-start=\"617\" data-end=\"660\"><span style=\"color: #800000;\">\ud83d\udd27 How to Fix Error 54113 \u2013 Step-by-Step<\/span><\/h2>\n<h3 data-start=\"662\" data-end=\"702\"><span style=\"color: #000080;\">\u2705 1. <strong data-start=\"671\" data-end=\"702\">Check Backend Server Status<\/strong><\/span><\/h3>\n<p data-start=\"703\" data-end=\"782\">Make sure your origin server is actually <strong data-start=\"744\" data-end=\"755\">running<\/strong> and accepting connections.<\/p>\n<ul data-start=\"783\" data-end=\"885\">\n<li data-start=\"783\" data-end=\"835\">\n<p data-start=\"785\" data-end=\"835\">If you use Apache: <code data-start=\"804\" data-end=\"835\">sudo systemctl status apache2<\/code><\/p>\n<\/li>\n<li data-start=\"836\" data-end=\"885\">\n<p data-start=\"838\" data-end=\"885\">If you use NGINX: <code data-start=\"856\" data-end=\"885\">sudo systemctl status nginx<\/code><\/p>\n<\/li>\n<\/ul>\n<p data-start=\"887\" data-end=\"915\">\ud83d\udccc If it\u2019s down, restart it:<\/p>\n<div class=\"contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary\">\n<div class=\"sticky top-9\">\n<div class=\"absolute end-0 bottom-0 flex h-9 items-center pe-2\">\n<div class=\"bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs\"><\/div>\n<\/div>\n<\/div>\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"whitespace-pre! language-bash\">sudo systemctl restart apache2<br \/>\n<span class=\"hljs-comment\"># or<\/span><br \/>\nsudo systemctl restart nginx<br \/>\n<\/code><\/div>\n<h3 dir=\"ltr\">Also Read : <a href=\"https:\/\/www.seminarsonly.com\/news\/ez-pass-text-scam-key-red-flags\/\">EZ Pass Text Scam | Key Red Flags<\/a><\/h3>\n<\/div>\n<hr data-start=\"994\" data-end=\"997\" \/>\n<h3 data-start=\"999\" data-end=\"1046\"><span style=\"color: #000080;\">\u2705 2. <strong data-start=\"1008\" data-end=\"1046\">Check Backend Port &amp; Configuration<\/strong><\/span><\/h3>\n<p data-start=\"1047\" data-end=\"1128\">Varnish needs to connect to the right port where your backend is serving content.<\/p>\n<ul data-start=\"1130\" data-end=\"1237\">\n<li data-start=\"1130\" data-end=\"1200\">\n<p data-start=\"1132\" data-end=\"1200\">Open your Varnish config file (usually <code data-start=\"1171\" data-end=\"1197\">\/etc\/varnish\/default.vcl<\/code>)<\/p>\n<\/li>\n<li data-start=\"1201\" data-end=\"1237\">\n<p data-start=\"1203\" data-end=\"1237\">Look for the <code data-start=\"1216\" data-end=\"1225\">backend<\/code> definition:<\/p>\n<\/li>\n<\/ul>\n<div class=\"contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary\">\n<div class=\"sticky top-9\">\n<div class=\"absolute end-0 bottom-0 flex h-9 items-center pe-2\">\n<div class=\"bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs\"><\/div>\n<\/div>\n<\/div>\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"whitespace-pre! language-vcl\">backend default {<br \/>\n.host = \"127.0.0.1\";<br \/>\n.port = \"8080\";<br \/>\n}<br \/>\n<\/code><\/div>\n<\/div>\n<ul data-start=\"1314\" data-end=\"1477\">\n<li data-start=\"1314\" data-end=\"1477\">\n<p data-start=\"1316\" data-end=\"1477\">Ensure the backend service (like Apache or NGINX) is <strong data-start=\"1369\" data-end=\"1402\">actually running on that port<\/strong>.<br data-start=\"1403\" data-end=\"1406\" \/>Example: Apache might default to port 80, but Varnish is trying 8080.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1479\" data-end=\"1492\">\ud83d\udd0d Test with:<\/p>\n<div class=\"contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary\">\n<div class=\"sticky top-9\">\n<div class=\"absolute end-0 bottom-0 flex h-9 items-center pe-2\">\n<div class=\"bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs\"><\/div>\n<\/div>\n<\/div>\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"whitespace-pre! language-bash\">curl http:\/\/127.0.0.1:8080<br \/>\n<\/code><\/div>\n<\/div>\n<p data-start=\"1532\" data-end=\"1566\">If it fails, there&#8217;s your problem.<\/p>\n<hr data-start=\"1568\" data-end=\"1571\" \/>\n<h3 data-start=\"1573\" data-end=\"1612\"><span style=\"color: #000080;\">\u2705 3. <strong data-start=\"1582\" data-end=\"1612\">Check for Backend Timeouts<\/strong><\/span><\/h3>\n<p data-start=\"1613\" data-end=\"1709\">Sometimes the backend is <strong data-start=\"1638\" data-end=\"1646\">slow<\/strong> or <strong data-start=\"1650\" data-end=\"1680\">returns incomplete headers<\/strong>, triggering a fetch failure.<\/p>\n<ul data-start=\"1711\" data-end=\"1754\">\n<li data-start=\"1711\" data-end=\"1754\">\n<p data-start=\"1713\" data-end=\"1754\">Increase timeout values in <code data-start=\"1740\" data-end=\"1753\">default.vcl<\/code>:<\/p>\n<\/li>\n<\/ul>\n<div class=\"contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary\">\n<div class=\"sticky top-9\"><\/div>\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"whitespace-pre! language-vcl\">backend default {<br \/>\n.host = \"127.0.0.1\";<br \/>\n.port = \"8080\";<br \/>\n.connect_timeout = 5s;<br \/>\n.first_byte_timeout = 10s;<br \/>\n.between_bytes_timeout = 5s;<br \/>\n}<br \/>\n<\/code><\/div>\n<\/div>\n<p data-start=\"1922\" data-end=\"1942\">Then reload Varnish:<\/p>\n<div class=\"contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"whitespace-pre! language-bash\">sudo systemctl reload varnish<br \/>\n<\/code><\/div>\n<\/div>\n<hr data-start=\"1986\" data-end=\"1989\" \/>\n<h3 data-start=\"1991\" data-end=\"2022\"><span style=\"color: #000080;\">\u2705 4. <strong data-start=\"2000\" data-end=\"2022\">Check Varnish Logs<\/strong><\/span><\/h3>\n<p data-start=\"2023\" data-end=\"2089\">Use <code data-start=\"2027\" data-end=\"2039\">varnishlog<\/code> or <code data-start=\"2043\" data-end=\"2055\">journalctl<\/code> to see exactly <strong data-start=\"2071\" data-end=\"2078\">why<\/strong> it failed:<\/p>\n<div class=\"contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"whitespace-pre! language-bash\">sudo varnishlog<br \/>\n<\/code><\/div>\n<\/div>\n<p data-start=\"2118\" data-end=\"2138\">Look for lines like:<\/p>\n<div class=\"contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"whitespace-pre!\"><span class=\"hljs-attribute\">FetchError<\/span>  backend connection failure<br \/>\n<\/code><\/div>\n<\/div>\n<p data-start=\"2186\" data-end=\"2256\">This will give exact details \u2014 like timeout, reset, bad response, etc.<\/p>\n<hr data-start=\"2258\" data-end=\"2261\" \/>\n<h3 data-start=\"2263\" data-end=\"2310\"><span style=\"color: #000080;\">\u2705 5. <strong data-start=\"2272\" data-end=\"2310\">Check for Bad Headers or Responses<\/strong><\/span><\/h3>\n<p data-start=\"2311\" data-end=\"2398\">Varnish is picky \u2014 if your backend sends malformed headers, it may reject the response.<\/p>\n<p data-start=\"2400\" data-end=\"2451\">Use <code data-start=\"2404\" data-end=\"2413\">curl -I<\/code> or a browser tool to inspect headers:<\/p>\n<div class=\"contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"whitespace-pre! language-bash\">curl -I http:\/\/127.0.0.1:8080<br \/>\n<\/code><\/div>\n<\/div>\n<p data-start=\"2494\" data-end=\"2504\">Check for:<\/p>\n<ul data-start=\"2505\" data-end=\"2572\">\n<li data-start=\"2505\" data-end=\"2531\">\n<p data-start=\"2507\" data-end=\"2531\">Missing <code data-start=\"2515\" data-end=\"2531\">Content-Length<\/code><\/p>\n<\/li>\n<li data-start=\"2532\" data-end=\"2554\">\n<p data-start=\"2534\" data-end=\"2554\">Invalid status codes<\/p>\n<\/li>\n<li data-start=\"2555\" data-end=\"2572\">\n<p data-start=\"2557\" data-end=\"2572\">Encoding issues<\/p>\n<\/li>\n<\/ul>\n<hr data-start=\"2574\" data-end=\"2577\" \/>\n<h3 data-start=\"2579\" data-end=\"2617\"><span style=\"color: #000080;\">\u2705 6. <strong data-start=\"2588\" data-end=\"2617\">Restart Services in Order<\/strong><\/span><\/h3>\n<p data-start=\"2618\" data-end=\"2679\">Sometimes Varnish is started <strong data-start=\"2647\" data-end=\"2657\">before<\/strong> the backend is ready.<\/p>\n<p data-start=\"2681\" data-end=\"2703\">Restart both in order:<\/p>\n<div class=\"contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary\">\n<div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"whitespace-pre! language-bash\">sudo systemctl restart apache2<br \/>\nsudo systemctl restart varnish<br \/>\n<\/code><\/div>\n<\/div>\n<hr data-start=\"2779\" data-end=\"2782\" \/>\n<h2 data-start=\"2784\" data-end=\"2823\"><span style=\"color: #800000;\">\ud83e\uddf0 Quick Summary: Fixing Error 54113<\/span><\/h2>\n<div class=\"_tableContainer_1rjym_1\">\n<div class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" style=\"height: 277px;\" width=\"706\" data-start=\"2825\" data-end=\"3105\">\n<thead data-start=\"2825\" data-end=\"2839\">\n<tr data-start=\"2825\" data-end=\"2839\">\n<th data-start=\"2825\" data-end=\"2832\" data-col-size=\"sm\">Step<\/th>\n<th data-start=\"2832\" data-end=\"2839\" data-col-size=\"md\">Fix<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"2855\" data-end=\"3105\">\n<tr data-start=\"2855\" data-end=\"2892\">\n<td data-start=\"2855\" data-end=\"2859\" data-col-size=\"sm\">1<\/td>\n<td data-start=\"2859\" data-end=\"2892\" data-col-size=\"md\">Check if backend server is up<\/td>\n<\/tr>\n<tr data-start=\"2893\" data-end=\"2948\">\n<td data-start=\"2893\" data-end=\"2897\" data-col-size=\"sm\">2<\/td>\n<td data-start=\"2897\" data-end=\"2948\" data-col-size=\"md\">Make sure Varnish is pointing to the right port<\/td>\n<\/tr>\n<tr data-start=\"2949\" data-end=\"2981\">\n<td data-start=\"2949\" data-end=\"2953\" data-col-size=\"sm\">3<\/td>\n<td data-start=\"2953\" data-end=\"2981\" data-col-size=\"md\">Test backend with <code data-start=\"2973\" data-end=\"2979\">curl<\/code><\/td>\n<\/tr>\n<tr data-start=\"2982\" data-end=\"3026\">\n<td data-start=\"2982\" data-end=\"2986\" data-col-size=\"sm\">4<\/td>\n<td data-start=\"2986\" data-end=\"3026\" data-col-size=\"md\">Review Varnish logs for fetch errors<\/td>\n<\/tr>\n<tr data-start=\"3027\" data-end=\"3058\">\n<td data-start=\"3027\" data-end=\"3031\" data-col-size=\"sm\">5<\/td>\n<td data-start=\"3031\" data-end=\"3058\" data-col-size=\"md\">Increase timeout values<\/td>\n<\/tr>\n<tr data-start=\"3059\" data-end=\"3105\">\n<td data-start=\"3059\" data-end=\"3063\" data-col-size=\"sm\">6<\/td>\n<td data-start=\"3063\" data-end=\"3105\" data-col-size=\"md\">Restart Varnish after backend is ready<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>The Error 54113 from a Varnish Cache Server is typically a backend connection error, which means Varnish couldn\u2019t reach your origin server (backend) or received an invalid response. It&#8217;s often&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6048],"tags":[],"class_list":["post-96690","post","type-post","status-publish","format-standard","hentry","category-error-fix"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>How To Fix Error 54113 Varnish Cache Server - Seminarsonly.com<\/title>\n<meta name=\"description\" content=\"The Error 54113 from a Varnish Cache Server is typically a backend connection error, which means Varnish couldn\u2019t reach your origin server (backend) or received an invalid response.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/seminarsonly.com\/news\/how-to-fix-error-54113-varnish-cache-server\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How To Fix Error 54113 Varnish Cache Server\" \/>\n<meta property=\"og:description\" content=\"The Error 54113 from a Varnish Cache Server is typically a backend connection error, which means Varnish couldn\u2019t reach your origin server (backend) or received an invalid response.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/seminarsonly.com\/news\/how-to-fix-error-54113-varnish-cache-server\/\" \/>\n<meta property=\"og:site_name\" content=\"Seminarsonly.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/facebook.com\/seminarsonly\" \/>\n<meta property=\"article:published_time\" content=\"2025-10-09T16:32:55+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-09T16:43:46+00:00\" \/>\n<meta name=\"author\" content=\"Freddy John\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@seminarsonly\" \/>\n<meta name=\"twitter:site\" content=\"@seminarsonly\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Freddy John\" \/>\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:\/\/seminarsonly.com\/news\/how-to-fix-error-54113-varnish-cache-server\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/seminarsonly.com\/news\/how-to-fix-error-54113-varnish-cache-server\/\"},\"author\":{\"name\":\"Freddy John\",\"@id\":\"https:\/\/seminarsonly.com\/news\/#\/schema\/person\/75cf706896b7210fb0a84651adc258bd\"},\"headline\":\"How To Fix Error 54113 Varnish Cache Server\",\"datePublished\":\"2025-10-09T16:32:55+00:00\",\"dateModified\":\"2025-10-09T16:43:46+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/seminarsonly.com\/news\/how-to-fix-error-54113-varnish-cache-server\/\"},\"wordCount\":337,\"commentCount\":0,\"articleSection\":[\"Error Fix\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/seminarsonly.com\/news\/how-to-fix-error-54113-varnish-cache-server\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/seminarsonly.com\/news\/how-to-fix-error-54113-varnish-cache-server\/\",\"url\":\"https:\/\/seminarsonly.com\/news\/how-to-fix-error-54113-varnish-cache-server\/\",\"name\":\"How To Fix Error 54113 Varnish Cache Server - 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