{"id":5457,"date":"2026-03-06T11:30:53","date_gmt":"2026-03-06T11:30:53","guid":{"rendered":"https:\/\/cheapsslweb.com\/resources\/?p=5457"},"modified":"2026-06-16T09:48:06","modified_gmt":"2026-06-16T09:48:06","slug":"how-to-fix-acme-ssl-certificate-errors","status":"publish","type":"post","link":"https:\/\/cheapsslweb.com\/resources\/how-to-fix-acme-ssl-certificate-errors\/","title":{"rendered":"How to Fix ACME SSL Certificate Errors?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">When you\u2019re <a href=\"https:\/\/cheapsslweb.com\/ssl-certificate-automation\">setting up or renewing SSL certificates with the ACME protocol<\/a>, everything should be quick and automated. But let\u2019s be honest\u2026 ACME errors can feel like hitting a wall at full speed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And the worst part? Most of them look cryptic enough to make anyone think something is seriously broken.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This guide breaks down the most common ACME SSL errors in plain English and gives you step-by-step fixes you can apply immediately, whether you\u2019re installing a new cert, automating renewals, or debugging failed domain validations.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Is ACME?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/cheapsslweb.com\/blog\/what-is-acme-importance-of-automated-certificate-management\/\">ACME (Automatic Certificate Management Environment)<\/a> is the protocol used by certificate authorities like Sectigo, Let\u2019s Encrypt, ZeroSSL, and Buypass to automate issuing and renewing SSL certificates.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Reasons Behind ACME SSL Errors and Their Fixes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">There are many reasons behind this error. Here we are going to discuss the top 12 reasons behind this error.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">External Account Binding Missing or Invalid<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If you see an error related to <a href=\"https:\/\/cheapsslweb.com\/blog\/what-is-acme-external-account-binding-eab\/\">External Account Binding (EAB)<\/a>, your ACME client is basically saying. \u201cHey, I can\u2019t prove you\u2019re allowed to use this ACME server.\u201d This happens when the ACME server requires EAB details, but your client didn\u2019t send the right ones.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">How to Fix It:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Check your HMAC key and Key ID<\/strong>: Copy\/paste them carefully. Extra breaks or line breaks will break validation.<\/li>\n\n\n\n<li><strong>Be sure you have the right ACME directory URL<\/strong>: Confusion of staging and production.<\/li>\n\n\n\n<li><strong>Add the proper EAB flags.<\/strong> In the case of acme.sh, your flags will be of the form:<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code><em>--eab-kid and --eab-hmac-key<\/em><\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Update your ACME client<\/strong>: Clients will tend to break here when they are older. EAB errors are normally corrected immediately as they are upgraded.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Account Does Not Exist<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This error <strong>&#8220;urn:ietf:params:acme:error:accountDoesNotExist&#8221; <\/strong>means your ACME client is pointing to an account that the CA simply doesn\u2019t know about.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Maybe you reinstalled the ACME client. Maybe you switched servers. Maybe you pointed a staging account at production. Either way, the CA has no idea who you are.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">How to Fix It:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Re-register your ACME account using the correct EAB credentials.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Example (acme.sh):<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code><em>acme.sh --register-account \\<\/em>\n<em>--server https:\/\/acme.your-ca.com\/v2\/DV \\<\/em>\n<em>--eab-kid YOUR_EAB_KID \\<\/em>\n<em>--eab-hmac-key YOUR_EAB_HMAC_KEY \\<\/em>\n<em>--accountemail you@example.com<\/em><\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Confirm the ACME server URL<\/strong>: Make sure it matches the endpoint used in your certificate order.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Don\u2019t reuse account files across servers<\/strong>: Unless you\u2019re 100% sure they\u2019re tied to the same CA account, avoid moving account.conf or private keys around.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Bad Nonce or Anti-Replay Error.<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">BadNonce error informs you that your request contained a stale or invalid nonce, a one-time token that ACME servers rely on to discourage replay attacks. This can sometimes be because of delays, clock drift, or proxies, making it slow.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">How to Fix It:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Just retry<\/strong>: The clients of the ACME, such as acme.sh, will tend to automatically retry. Otherwise, restart the command.<\/li>\n\n\n\n<li><strong>Sync your server clock<\/strong>: Run the command:<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code><em>timedatectl status\ntimedatectl set-ntp true<\/em><\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>By-pass proxy servers or<\/strong> <strong>content distribution networks<\/strong>: Possible services such as Cloudflare can stall the requests to the extent of nullifying the nonce.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">A Requested Identifier Has Not Been Delegated<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This error usually appears as: <strong><em>\u201c urn:ietf:params:acme:error:rejectedIdentifier \u201d<\/em><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It means that the ACME server can\u2019t validate one of the domain names you provided. <strong>Reasons include:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The domain doesn\u2019t exist in DNS<\/li>\n\n\n\n<li>DNS isn\u2019t pointing to your server<\/li>\n\n\n\n<li>The domain isn\u2019t authorised in your certificate order<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">How to Fix It:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Use the correct domain format:<br>\u201c<\/strong>Correct: -d example.com&nbsp;&nbsp; Wrong: -d http:\/\/example.com\u201d<\/li>\n\n\n\n<li><strong>Check DNS resolution<\/strong>: <em>\u201cdig example.com +short\u201d<\/em><\/li>\n\n\n\n<li><strong>Match the ACME order: <\/strong>Some CAs require all domains to be pre-approved.<\/li>\n\n\n\n<li><strong>Check for typos: <\/strong><em>\u201cwww.example.com \u2260 example.com\u201d<\/em><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Unauthorised or Invalid Response<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This one is extremely common. You\u2019ll usually see:<br><strong><em>\u201c urn:ietf:params:acme:error:unauthorized \u201d<\/em><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The CA tried to verify the HTTP challenge file, but:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>couldn\u2019t reach your server,<\/li>\n\n\n\n<li>got redirected,<\/li>\n\n\n\n<li>hit HTTPS too early,<\/li>\n\n\n\n<li>Or didn\u2019t see the challenge at all.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">How to Fix It:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Make sure <a href=\"https:\/\/cheapsslweb.com\/blog\/what-is-port-80-common-security-risks-associated-with-port-80-http\/\">port 80<\/a> is open (even if you force HTTPS).<\/li>\n\n\n\n<li>Ensure challenge files are placed under: \u201c<strong>\/.well-known\/acme-challenge\/<\/strong>.\u201d<\/li>\n\n\n\n<li>Temporarily disable forced redirects.<\/li>\n\n\n\n<li>Disable firewalls, proxies, or CDNs blocking access.<\/li>\n\n\n\n<li>Check file permissions and ensure the challenge file is publicly viewable.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Token Not Found or File Not Reachable (404 or 403)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>This happens when the CA tries to fetch: <\/strong><em>\u201c http:\/\/yourdomain.com\/.well-known\/acme-challenge\/&lt;token&gt; \u201d<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u2026and gets:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>404 (Not Found)<\/li>\n\n\n\n<li>403 (Forbidden)<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">How to Fix It:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Confirm the ACME client writes the file to the correct webroot.<\/li>\n\n\n\n<li>Visit the challenge URL in your browser you should see the token.<\/li>\n\n\n\n<li>Ensure correct permissions and file ownership.<\/li>\n\n\n\n<li>Remove or <strong>adjust .htaccess<\/strong>, firewall rules, or security plugins blocking access.<\/li>\n\n\n\n<li>Check for <strong>SELinux\/AppArmor restrictions<\/strong> on some systems.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">CAA Record Forbids Issuance<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">CAA records tell the world which CAs are allowed to issue certificates for your domain. If you see: <strong><em>\u201curn:ietf:params:acme:error:caa\u201d<\/em><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Your DNS says, \u201c<strong>This CA is not allowed<\/strong>.\u201d<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">How to Fix It:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Check your DNS:<\/strong> dig CAA yourdomain.com<\/li>\n\n\n\n<li><strong>Ensure your CA is listed, e.g.<\/strong>: 0 issue &#8220;sectigo.com&#8221; and 0 issue &#8220;digicert.com&#8221;<\/li>\n\n\n\n<li><strong>For wildcard certs, also add:<\/strong> 0 issuewild &#8220;sectigo.com&#8221;<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Wait for DNS propagation and retry.<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">TXT Record Not Found (Wildcard Certificates)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/cheapsslweb.com\/ssl-types\/cheap-wildcard-ssl-certificates\">Wildcard domains<\/a> (like *.example.com) require DNS-01 validation. No exceptions. That means ACME expects a TXT record at: <strong>_acme-challenge.example.com<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If it\u2019s missing or not propagated yet, you&#8217;ll get an error.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">How to Fix It:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Add a TXT record:<\/strong><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>Name: _acme-challenge.example.com\nValue: (token provided by ACME client)<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Wait 1\u201310 minutes<\/strong> (some DNS providers take longer).<\/li>\n\n\n\n<li><strong>Verify propagation:<\/strong> \u201c dig TXT _acme-challenge.example.com \u201d<\/li>\n\n\n\n<li><strong>Retry the validation.<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Also Read:<\/strong> <a href=\"https:\/\/cheapsslweb.com\/blog\/acme-challenges-for-domain-validation-which-is-best\/\">ACME Challenges for Domain Validation: Which is Best?<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Too Many Requests or Rate Limited<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If you see: <strong><em>\u201c urn:ietf:params:acme:error:rateLimited \u201d <\/em><\/strong>or a <a href=\"https:\/\/cheapsslweb.com\/resources\/what-is-error-code-429-how-to-fix-http-429-too-many-requests-error\">429 Too Many Requests<\/a>, your CA is throttling you because your client sent too many requests too fast.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">How to Fix It:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Wait until the rate limit resets (varies by CA).<\/li>\n\n\n\n<li>Fix the root cause before retrying, especially DNS-01 retries.<\/li>\n\n\n\n<li>Avoid spamming validation requests without checking TXT propagation first.<\/li>\n\n\n\n<li>Check your CA\u2019s documentation for your exact rate-limit window.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Could Not Connect to ACME Server<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If your server can\u2019t reach the ACME endpoint, you\u2019ll see connection errors:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Timeout<\/li>\n\n\n\n<li>Connection refused<\/li>\n\n\n\n<li>Could not connect<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">How to Fix It:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Allow outbound HTTPS on <a href=\"https:\/\/cheapsslweb.com\/blog\/port-443-https\/\">port 443<\/a>.<\/li>\n\n\n\n<li>Fix the firewall or outbound rules.<\/li>\n\n\n\n<li>Verify DNS resolver settings.<\/li>\n\n\n\n<li>Test manually: curl https:\/\/acme.example.com<\/li>\n\n\n\n<li>Restart your ACME client once connectivity is restored.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>When you\u2019re setting up or renewing SSL certificates with the ACME protocol, everything should be quick and automated. But let\u2019s be honest\u2026 ACME errors can feel like hitting a wall at full speed. And the worst part? Most of them look cryptic enough to make anyone think something is seriously broken. This guide breaks down<span class=\"morelink d-block mt-3\"><a href=\"https:\/\/cheapsslweb.com\/resources\/how-to-fix-acme-ssl-certificate-errors\/\">Read More<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":5458,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[568],"tags":[576,549,550],"class_list":["post-5457","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ssl-automation","tag-acme-configuration-errors","tag-acme-errors","tag-acmeclient-error","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Most Common ACME SSL Certificate Errors and How to Fix Them<\/title>\n<meta name=\"description\" content=\"Struggling with ACME errors? 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