{"id":23065,"date":"2026-01-12T00:00:26","date_gmt":"2026-01-11T16:00:26","guid":{"rendered":"https:\/\/beyond-shenzhen.cn\/?post_type=blog&p=23065"},"modified":"2026-04-08T14:53:32","modified_gmt":"2026-04-08T06:53:32","slug":"ssl-certificate-website","status":"publish","type":"blog","link":"https:\/\/beyond-shenzhen.cn\/en\/blog\/ssl-certificate-website\/","title":{"rendered":"\u3010SSL\/TLS\u3011Why It’s Essential to Install on Your Website"},"content":{"rendered":"

In recent years, supporting “Always-on SSL\/TLS\uff08https\uff09” encryption has become the standard for websites.<\/p>\n

However, in reality, many sites are still operating via unencrypted “http”.<\/p>\n

We still frequently encounter browser security warnings, not only on personal blogs or small websites, but even on corporate websites.<\/p>\n

Why Are SSL\/TLS Certificates Necessary?<\/h2>\n

SSL\/TLS certificates are a critical mechanism for safeguarding website security.<\/p>\n

They encrypt the internet connection between the server and the user, preventing data leakage and tampering. At the same time, they verify the legitimacy of the website, proving that it is authentic and safe to use.<\/p>\n\n\n\n\n\n\n
Main Role<\/span><\/td>\nKey Benefits<\/span><\/td>\n<\/tr>\n
Data Encryption<\/td>\nIt encrypts data exchanged between the user and the website, such as credit card information, passwords, and personal details. This effectively prevents third parties from eavesdropping on or tampering with the data.<\/td>\n<\/tr>\n
Identity Verification<\/td>\nThe SSL\/TLS Certificate Authority \uff08CA\uff09 verifies the website operator to confirm that the site is legitimate and authentic. This helps users easily distinguish your site from malicious phishing sites.<\/td>\n<\/tr>\n
Enhanced Trust<\/td>\nThe “padlock icon” and “https:\/\/” displayed in the browser address bar act as proof that the SSL\/TLS certificate is correctly configured. This allows visitors to use the website with peace of mind.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n\n\n
Benefits of Enabling SSL\/TLS\uff08https\uff09<\/span><\/td>\nRisks of Ignoring SSL\/TLS \uff08http\uff09<\/span><\/td>\n<\/tr>\n
Protects Data<\/td>\nSecures customer information and transaction data through encryption, ensuring privacy and safety.<\/td>\nSecurity Risks<\/td>\nHigh risk of data breaches and leaks. Browsers will display “Not Secure” warnings, alerting users to the lack of encryption.<\/td>\n<\/tr>\n
Builds Trust<\/td>\nEstablishes a professional and secure corporate image, allowing visitors to use the site with confidence.<\/td>\nBrand Damage & Sales Loss<\/td>\nThe site may be completely blocked by browsers. Security warnings damage the brand image, leading to lost business opportunities and a drop in sales.<\/td>\n<\/tr>\n
SEO Boost<\/td>\nhttps is officially recognized as a ranking signal by search engines like Google, helping to improve visibility.<\/td>\nSearch Engine Penalties<\/td>\nRisk of suffering from SEO penalties, causing rankings to plummet. In severe cases, the domain may be blacklisted.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

Common Causes of SSL\/TLS Certificate Errors<\/h2>\n

Deploying an SSL\/TLS certificate is the foundation of website security and trust.<\/p>\n

However, simply installing a certificate does not guarantee that all issues will be resolved.<\/p>\n

Even after configuration, browser warnings or connection errors may still occur due to various factors.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Category<\/span><\/td>\nSpecific Cause<\/span><\/td>\nDetails &<\/span> Notes<\/td>\n<\/tr>\n
Certificate Issues<\/span><\/td>\nExpired Certificate<\/td>\nOne of the most common causes. Certificates currently require annual renewal.<\/p>\n

* Validity periods will be shortened in the future:
\n<\/span>
\n\u30fbFrom Mar 15, 2026: 200 days
\n<\/span>\u30fbFrom Mar 15, 2027: 100 days<\/span>
\n\u30fbFrom Mar 15, 2029: 47 days<\/span><\/td>\n<\/tr>\n

Domain Mismatch<\/td>\nThe domain name registered on the certificate does not match the URL the user is currently accessing.<\/td>\n<\/tr>\n
Untrusted Issuer<\/td>\nThe site uses a self-signed certificate or a certificate issued by a Certificate Authority\uff08CA\uff09 that the browser does not trust.<\/td>\n<\/tr>\n
Server Configuration<\/span><\/td>\nOutdated Protocols \/ Weak Ciphers<\/td>\nThe server only supports old versions like TLS 1.0 or 1.1. Modern browsers treat these as security risks and block the connection.<\/td>\n<\/tr>\n
Missing Intermediate Certificate<\/td>\nThe necessary intermediate certificates are not installed on the server (incomplete installation), breaking the “chain of trust.”<\/td>\n<\/tr>\n
SNI\uff08Server Name Indication\uff09Incompatibility<\/td>\nIssues occurring on older servers or specific environments when hosting multiple “https” domains on a single server IP.<\/td>\n<\/tr>\n
Source Code<\/span><\/td>\nMixed Content<\/td>\nThe website contains code with “http” links. If images, JavaScript, or CSS are loaded via “http” on an https page, browsers will block them.<\/td>\n<\/tr>\n
Client \/ Environment<\/span><\/td>\nOutdated Browser<\/td>\nThe user’s browser version is too old to support modern certificate standards or encryption methods.<\/td>\n<\/tr>\n
Firewall \/ Proxy Interference<\/td>\nCorporate networks performing traffic inspection \uff08MITM\uff09 may substitute their own certificates, causing browser errors.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

Examples of Common Website Error Messages<\/h3>\n

When a user visits a website that has SSL\/TLS issues, their browser will display error messages like the ones shown below.<\/p>\n

These are not just simple “errors” . they are vital clues that specifically indicate security risks or connection failures.<\/p>\n

Here, we introduce some of the most common error messages you might encounter due to SSL\/TLS configuration problems.<\/p>\n\n\n\n\n\n\n\n\n
Browser Error Message Example<\/span><\/td>\nRepresentative Error<\/span> Code<\/span><\/td>\nProbable Causes<\/span><\/td>\n<\/tr>\n
\u201cNot Secure\u201d<\/span>
\n“Your connection is not private”<\/span><\/td>\n		ERR_CERT_INVALID
\nERR_CERT_AUTHORITY_INVALID
\nSSL_ERROR_BAD_CERT_DOMAIN<\/td>\n		\u30fbCertificate has expired.<\/p>\n

\u30fbDomain mismatch \uff08The certificate is for a different URL\uff09.<\/p>\n

\u30fbUsing a Self-signed certificate.<\/p>\n

\u30fbThe issuer\uff08CA\uff09 is not trusted by the browser.<\/td>\n<\/tr>\n

“This site can’t provide a secure connection”<\/span><\/td>\nERR_SSL_VERSION_OR_CIPHER_MISMATCH
\nSSL_ERROR_NO_CYPHER_OVERLAP<\/td>\n		\u30fbThe server’s protocols\/ciphers do not match the client browser’s supported versions (e.g., server only supports old TLS).<\/p>\n

\u30fbServer configuration errors.<\/td>\n<\/tr>\n

“Connection is not secure”<\/span>
\n“Your connection is not private”<\/span><\/td>\n		ERR_CERT_COMMON_NAME_INVALID
\nERR_CERT_DATE_INVALID<\/td>\n		\u30fbCertificate has expired.<\/p>\n

\u30fbCommon Name (CN) mismatch (The certificate’s CN does not match the accessed domain).<\/td>\n<\/tr>\n

“This site can’t be reached”<\/span><\/td>\nERR_CONNECTION_CLOSED
\nERR_CONNECTION_REFUSED
\nERR_CONNECTION_TIMED_OUT
\nERR_NAME_NOT_RESOLVED<\/td>\n		\u30fbServer is down.<\/p>\n

\u30fbNetwork or firewall configuration issues.<\/p>\n

\u30fbDNS resolution failed.<\/p>\n

\u30fbServer SSL\/TLS settings are too old and rejected by the client’s security policy.<\/td>\n<\/tr>\n

Red padlock icon or<\/span>
\nStrikethrough on padlock<\/span><\/td>\n		Visual Warning in Browser<\/td>\n\u30fbThe site source code contains “Mixed Content” \uff08loading HTTP resources like images\/scripts on an HTTPS page\uff09.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

Solutions and Troubleshooting for Website Administrators<\/h2>\n

If an SSL\/TLS error occurs, immediate action is required to ensure a secure browsing environment for your users.<\/p>\n

Below, we outline effective troubleshooting steps and solutions that website administrators can implement themselves.<\/p>\n

Simply by following these basic maintenance practices, you can resolve and prevent the majority of SSL\/TLS issues.<\/p>\n

    \n
  1. Run diagnostics using tools like SSL Server Test.<\/a><\/li>\n
  2. Enable TLS 1.2 \/ 1.3 only and disable outdated protocols.<\/li>\n
  3. Check source code to ensure there is no Mixed Content.<\/li>\n
  4. Regularly check and renew certificate expiration dates.<\/li>\n
  5. Periodically update server security configurations.<\/li>\n
  6. Set up automated monitoring and error alerts.<\/li>\n<\/ol>\n

    Conclusion<\/h2>\n

    SSL\/TLS is the indispensable foundation of security in the modern internet.<\/p>\n

    Therefore, it is no longer a question of “whether or not to deploy” a certificate; rather, it is a mandatory requirement serving as the minimum security standard.<\/p>\n

    For both users and website administrators, understanding this mechanism is the first step toward a safer internet experience.<\/p>\n

    Related Services<\/h3>\n\n\n\n\n
    Website Development<\/span><\/td>\nhttps:\/\/beyond-shenzhen.cn\/en\/service\/website<\/a><\/td>\n<\/tr>\n
    Managed Cloud Services<\/span><\/td>\nhttps:\/\/beyond-shenzhen.cn\/en\/service\/server<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

     <\/p>\n

    For Website Development and Managed Cloud Services<\/a><\/p>\n

     <\/p>\n","protected":false},"excerpt":{"rendered":"

    In recent years, supporting “Always-on SSL\/TLS\uff08https\uff09” encryption has become the standard for websites. However, in reality, many sites are still operating via unencrypted “http”. We still frequently encounter browser security warnings, not only on personal blogs or small websites, but even on corporate websites. Why Are SSL\/TLS Certificates Necessary? SSL\/TLS certificates are a critical mechanism […]<\/p>\n","protected":false},"author":3,"featured_media":23028,"template":"","meta":{"_acf_changed":false,"om_disable_all_campaigns":false,"_locale":"en_US","_original_post":"https:\/\/beyond-shenzhen.cn\/?post_type=blog&p=23022"},"tags":[],"blogcat":[12],"class_list":["post-23065","blog","type-blog","status-publish","has-post-thumbnail","hentry","blogcat-it-web","en-US"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/beyond-shenzhen.cn\/wp-json\/wp\/v2\/blog\/23065","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/beyond-shenzhen.cn\/wp-json\/wp\/v2\/blog"}],"about":[{"href":"https:\/\/beyond-shenzhen.cn\/wp-json\/wp\/v2\/types\/blog"}],"author":[{"embeddable":true,"href":"https:\/\/beyond-shenzhen.cn\/wp-json\/wp\/v2\/users\/3"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/beyond-shenzhen.cn\/wp-json\/wp\/v2\/media\/23028"}],"wp:attachment":[{"href":"https:\/\/beyond-shenzhen.cn\/wp-json\/wp\/v2\/media?parent=23065"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/beyond-shenzhen.cn\/wp-json\/wp\/v2\/tags?post=23065"},{"taxonomy":"blogcat","embeddable":true,"href":"https:\/\/beyond-shenzhen.cn\/wp-json\/wp\/v2\/blogcat?post=23065"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}