{"id":5390,"date":"2026-01-20T08:35:02","date_gmt":"2026-01-20T08:35:02","guid":{"rendered":"https:\/\/cheapsslweb.com\/resources\/?p=5390"},"modified":"2026-01-20T08:49:24","modified_gmt":"2026-01-20T08:49:24","slug":"troubleshooting-ssl-certificate-chains-issues","status":"publish","type":"post","link":"https:\/\/cheapsslweb.com\/resources\/troubleshooting-ssl-certificate-chains-issues\/","title":{"rendered":"Troubleshooting SSL Certificate Chains Issues"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Introduction<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">An SSL certificate is an important tool for website protection and the enforcement of cryptographic connections between the server and the client. However, SSL certificate chains may have certain issues that can lead to some troubles for site visitors starting from some annoyances to the impossibility of accessing the site at all. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This guide will look at the various SSL certificate chain implementation problems, along with the prescribed instructions to fix these problems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">From site owners to developers and even sys admins, it pays to know these by heart to prevent future website headaches or garner a solid remedy for existing ones. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Now that we know the issues that can arise with <a href=\"https:\/\/cheapsslweb.com\/blog\/what-is-ssl-certificate-chain\/\">SSL certificate chains<\/a> and the potential cost of not dealing with them correctly, it\u2019s time to look at the most common problems and how you can address them.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"_Vv1laZTFLvaXseMP2pnfqAY_48\">Common SSL Certificate Chain Errors &amp; Solutions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Incomplete Certificate Chain<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Issue:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">One of the most common SSL certificate chain problems is an incomplete chain. This occurs when <a href=\"https:\/\/cheapsslweb.com\/resources\/what-is-intermediate-certificate-and-how-to-download-it\">intermediate certificates<\/a> are missing from the server configuration.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Solution:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Obtain the full certificate chain from your CA.<\/li>\n\n\n\n<li>Log in to your server via <a href=\"https:\/\/cheapsslweb.com\/blog\/an-ultimate-guide-on-secure-shell-protocol\/\">SSH<\/a>.<\/li>\n\n\n\n<li>Navigate to your SSL certificate directory (usually \/etc\/ssl\/certs\/).<\/li>\n\n\n\n<li>Open your current certificate file using a text editor:<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo nano your_domain_name.crt<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Paste the intermediate certificates below your server certificate.<\/li>\n\n\n\n<li>Save the file and exit the editor.<\/li>\n\n\n\n<li>Restart your web server.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For Apache:<\/strong> <\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo service apache2 restart<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For Nginx: <\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo service nginx restart<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Incorrectly Ordered Certificate Chain<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Issue:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Sometimes, the certificate chain is complete but in the wrong order, causing validation errors.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Solution:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Open your certificate file:<br><strong>sudo nano \/etc\/ssl\/certs\/your_domain_name.crt<\/strong><\/li>\n\n\n\n<li>Ensure the order is correct.<\/li>\n\n\n\n<li>Your domain&#8217;s certificate should be at the top.<\/li>\n\n\n\n<li>Intermediate certificates should follow in order, from the one that signed your certificate to the one closest to the root certificate.<\/li>\n\n\n\n<li>The <a href=\"https:\/\/cheapsslweb.com\/resources\/what-is-a-root-ca-certificate\">root certificate<\/a> should not be included.<\/li>\n\n\n\n<li>Save the file and restart your web server.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Expired Intermediate Certificates<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Issue:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Even if your domain certificate is valid, expired intermediate certificates can cause chain validation failures.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Solution:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Check the expiration dates of all certificates in your chain:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>openssl verify -verbose -CAfile \/path\/to\/root_cert.pem \/path\/to\/your_cert_chain.pem<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>If any intermediate certificates have expired:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Contact your CA for updated intermediate certificates.<\/li>\n\n\n\n<li>Replace the expired certificates in your chain.<\/li>\n\n\n\n<li>Restart your web server.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Also Read:<\/strong> <a href=\"https:\/\/cheapsslweb.com\/resources\/how-to-resolve-error_ssl_unexpected_message\">How to Resolve ERROR_SSL_UNEXPECTED_MESSAGE?<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Self-Signed Certificates in the Chain<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Issue:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Including <a href=\"https:\/\/cheapsslweb.com\/resources\/self-signed-ssl-certificate-vs-trusted-ca-certificate\">self-signed certificates<\/a> in your chain can cause validation errors and security warnings.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Solution:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Remove any self-signed certificates from your chain.<\/li>\n\n\n\n<li>Ensure you&#8217;re using certificates issued by a trusted CA.<\/li>\n\n\n\n<li><strong>If you need a self-signed certificate for testing:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Create a separate configuration for development environments.<\/li>\n\n\n\n<li>Never use self-signed certificates in production.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Also Read:<\/strong> <a href=\"https:\/\/cheapsslweb.com\/resources\/how-to-resolve-the-self-signed-certificate-in-certificate-chain-error\">How to Resolve the \u201cSelf-Signed Certificate in Certificate Chain\u201d Error?<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Missing Root Certificate<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Issue:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Some servers might not include root certificates in their trust stores, leading to validation failures.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Solution:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Check if the root certificate is missing using the command:<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>openssl s_client -connect your_domain.com:443 -showcerts<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>If you don&#8217;t have any, download the root certificate from your CA.<\/li>\n\n\n\n<li>Add it to your server&#8217;s trust store:<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For Ubuntu\/Debian:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo cp root_cert.crt \/usr\/local\/share\/ca-certificates\/\nsudo update-ca-certificates<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For CentOS\/RHEL:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo cp root_cert.crt \/etc\/pki\/ca-trust\/source\/anchors\/\nsudo update-ca-trust extract<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Mismatched Server Name Indication (SNI)<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Issue:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">When hosting <a href=\"https:\/\/cheapsslweb.com\/ssl-types\/multi-domain-ssl\">multiple SSL certificates on a single IP address<\/a>, SNI mismatches can occur.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Solution:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ensure your server software supports <a href=\"https:\/\/cheapsslweb.com\/blog\/what-is-server-name-indication-sni-difference-between-sni-and-san\/\">SNI<\/a> (most modern servers do).<\/li>\n\n\n\n<li>Configure your virtual hosts correctly:<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For Apache:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;VirtualHost *:443&gt;\n&nbsp;&nbsp;&nbsp; ServerName your_domain.com\n&nbsp;&nbsp;&nbsp; SSLEngine on\n&nbsp;&nbsp;&nbsp; SSLCertificateFile \/path\/to\/your_domain_cert.pem\n&nbsp;&nbsp;&nbsp; SSLCertificateKeyFile \/path\/to\/your_domain_key.pem\n&nbsp;&nbsp;&nbsp; SSLCertificateChainFile \/path\/to\/your_chain_file.pem\n&lt;\/VirtualHost&gt;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For Nginx:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>server {\n&nbsp;&nbsp;&nbsp; listen 443 ssl;\n&nbsp;&nbsp;&nbsp; server_name your_domain.com;\n&nbsp;&nbsp;&nbsp; ssl_certificate \/path\/to\/your_domain_cert.pem;\n&nbsp;&nbsp;&nbsp; ssl_certificate_key \/path\/to\/your_domain_key.pem;\n}<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Restart your web server after making changes.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Certificate and Private Key Mismatch<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Issue:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">If the private key doesn&#8217;t match the certificate, <a href=\"https:\/\/cheapsslweb.com\/blog\/how-to-fix-ssl-tls-handshake-failed-error\/\">SSL handshakes will fail<\/a>.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Solution:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Check if the certificate and key match:<\/strong><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>openssl x509 -noout -modulus -in your_certificate.pem | openssl md5\nopenssl rsa -noout -modulus -in your_private_key.pem | openssl md5<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>If the outputs don&#8217;t match, you&#8217;ll need to:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Generate a new Certificate Signing Request (CSR) with the correct private key.<\/li>\n\n\n\n<li><a href=\"https:\/\/cheapsslweb.com\/buy-ssl-certificates\">Obtain a new certificate from your CA<\/a> using this CSR.<\/li>\n\n\n\n<li>Install the new certificate and ensure it matches the private key.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Insufficient Cipher Suite Support<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Issue:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Outdated server configurations might not support <a href=\"https:\/\/cheapsslweb.com\/blog\/tls-1-2-and-tls-1-3-supported-cipher-suites\/\">modern cipher suites<\/a>, causing connection issues for some clients.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Solution:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Check your current cipher suite support:<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>nmap --script ssl-enum-ciphers -p 443 your_domain.com<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Update your server configuration to include strong, modern cipher suites:<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For Apache:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SSLCipherSuite EECDH+<a>AESGCM:EDH<\/a>+<a>AESGCM:AES<\/a>256+<a>EECDH:AES<\/a>256+EDH<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Restart your web server to apply the changes.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Also Read:<\/strong> <strong><a href=\"https:\/\/cheapsslweb.com\/resources\/how-to-fix-err_ssl_version_or_cipher_mismatch-error\">How to Fix ERR_SSL_VERSION_OR_CIPHER_MISMATCH Error?<\/a><\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Incorrect File Permissions<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Issue:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Incorrect file permissions can prevent the web server from reading certificate files.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Solution:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Check current file permissions:<\/strong><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>ls -l \/path\/to\/your\/ssl\/files<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Set correct permissions:<\/strong><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo chmod 644 your_certificate.pem\nsudo chmod 600 your_private_key.pem<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ensure the web server user has read access to the certificate files.<\/li>\n\n\n\n<li>Restart your web server.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Protocol Version Mismatch<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Issue:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Supporting <a href=\"https:\/\/cheapsslweb.com\/blog\/list-of-tls-versions-which-is-the-latest-tls-version\/\">outdated SSL\/TLS versions<\/a> can lead to security vulnerabilities.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Solution:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Check supported protocols:<\/strong><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>nmap --script ssl-enum-ciphers -p 443 your_domain.com\n<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Update your server configuration to disable old protocols:<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For Apache:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SSLProtocol all -SSLv3 -TLSv1 -TLSv1.1<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For Nginx:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ssl_protocols TLSv1.2 TLSv1.3;<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Restart your web server.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Certificate Revocation Issues<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Issue:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Using a <a href=\"https:\/\/cheapsslweb.com\/blog\/what-is-a-certificate-revocation-list\/\">revoked certificate<\/a> can cause security warnings and connection failures.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Solution:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Check if your certificate is revoked:<\/strong><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>openssl ocsp -issuer \/path\/to\/issuer_cert.pem -cert \/path\/to\/your_cert.pem -text -url http:\/\/ocsp.your-ca.com<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>If revoked, contact your CA to understand the reason and potentially get a new certificate.<\/li>\n\n\n\n<li><strong>Implement <a href=\"https:\/\/cheapsslweb.com\/blog\/what-is-ocsp-and-ocsp-stapling\/\">OCSP stapling<\/a> to improve performance:<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For Apache:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SSLUseStapling on\nSSLStaplingCache \"shmcb:logs\/stapling-cache(150000)\"<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For Nginx:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ssl_stapling on;\nssl_stapling_verify on;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Clock Synchronization Issues<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Issue:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Server clocks that are significantly out of sync can cause certificate validation failures.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Solution:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Check your server&#8217;s current time:<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>If incorrect, update it:<\/strong><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo ntpdate pool.ntp.org<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Configure NTP for ongoing synchronization:<\/strong><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo apt-get install ntp\nsudo systemctl enable ntp\nsudo systemctl start ntp<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Verify NTP is working correctly:<\/strong> <\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>ntpq -p<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Consider setting up multiple NTP servers for redundancy:<\/strong><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>server 0.pool.ntp.org\nserver 1.pool.ntp.org\nserver 2.pool.ntp.org\nserver 3.pool.ntp.org<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Implement a monitoring solution to alert you if your server&#8217;s time drifts significantly.<\/li>\n\n\n\n<li>For virtual machines, ensure the hypervisor&#8217;s time is correctly synchronized with NTP as well.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Mixed Content Warnings<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Issue:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Even with a <a href=\"https:\/\/cheapsslweb.com\/buy-ssl-certificates\">valid SSL certificate<\/a>, loading HTTP resources on an HTTPS page can trigger <a href=\"https:\/\/cheapsslweb.com\/resources\/how-to-fix-mixed-content-wordpress-warnings\">mixed content warnings<\/a>.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Solution:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Identify mixed content:<\/li>\n\n\n\n<li>Use browser developer tools to find HTTP resources.<\/li>\n\n\n\n<li>Run a content scan using online tools like <a href=\"https:\/\/certera.com\/ssl-tools\/why-no-padlock\">WhyNoPadlock<\/a> or <a href=\"https:\/\/certera.com\/ssl-tools\/ssl-checker\">SSL Check<\/a>.<\/li>\n\n\n\n<li>Replace &#8220;http:\/\/&#8221; with &#8220;https:\/\/&#8221; for all resources.<\/li>\n\n\n\n<li>Use protocol-relative URLs (e.g., &#8220;\/\/example.com\/resource&#8221;) when appropriate.<\/li>\n\n\n\n<li><strong>Implement Content Security Policy (CSP) headers:<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For Apache, add to your .htaccess file:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Header set Content-Security-Policy \"upgrade-insecure-requests<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For Nginx, add to your server block:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>add_header Content-Security-Policy \"upgrade-insecure-requests\";<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use automatic HTTPS rewrites for external resources when possible.<\/li>\n\n\n\n<li>Update any hardcoded internal links to use HTTPS.<\/li>\n\n\n\n<li>Check and update any APIs or third-party services to ensure they support HTTPS.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/cheapsslweb.com\/resources\/what-is-hsts-certificate\">Implement HSTS (HTTP Strict Transport Security)<\/a> to force HTTPS connections:<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For Apache:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Header always set Strict-Transport-Security \"max-age=31536000; includeSubDomains\"<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>For Nginx:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>add_header Strict-Transport-Security \"max-age=31536000; includeSubDomains\" always;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">It is immensely important to solve the SSL certificate chain issues to have a secure and trustworthy website. Thus, by applying the solutions offered in this guide, you can address typical issues connected with organizing the SSL and guarantee that it will remain efficient and flawless.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction An SSL certificate is an important tool for website protection and the enforcement of cryptographic connections between the server and the client. However, SSL certificate chains may have certain issues that can lead to some troubles for site visitors starting from some annoyances to the impossibility of accessing the site at all. This guide<span class=\"morelink d-block mt-3\"><a href=\"https:\/\/cheapsslweb.com\/resources\/troubleshooting-ssl-certificate-chains-issues\/\">Read More<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":5394,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[389],"tags":[523,524],"class_list":["post-5390","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ssl-and-encryption","tag-incomplete-ssl-certificate-chain","tag-ssl-certificate-chain-issues","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 SSL Certificate Chain Issues &amp; Their Solutions<\/title>\n<meta name=\"description\" content=\"Understand here what are the most common SSL Certificate Chain Issues and Their Solutions to fix SSL misconfiguration.\" \/>\n<meta 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