Website maintenance

Resolving Common SSL Errors in WordPress: A Troubleshooting Guide

Common SSL Errors in WordPress

Common SSL Errors in WordPress

Secure Sockets Layer (SSL) is crucial for ensuring the security and integrity of data exchanged on the internet. For WordPress site owners, implementing SSL is essential for safeguarding user data and boosting their website’s credibility and search engine ranking. However, a few common SSL errors can sometimes hinder the journey to a secure HTTPS site. This guide aims to help you navigate and resolve these issues, ensuring a smooth and secure browsing experience for your visitors.

Understanding SSL Errors

SSL errors occur when the browser cannot verify the SSL certificate of a website, leading to warning messages that can deter visitors from accessing your site. These issues can arise from various causes, including expired certificates, misconfiguration, and server errors.

Common SSL Errors and Their Solutions

1. SSL Certificate Not Trusted

This error appears when the SSL certificate is not issued by a trusted Certificate Authority (CA). To resolve this:

  • Ensure a recognized CA issues your SSL certificate.
  • If you’re using a self-signed certificate for testing purposes, consider purchasing a certificate from a reputable CA for your live site.

2. Mixed Content Error

Mixed content issues occur when a secure page (HTTPS) contains links to unsecured (HTTP) resources. To fix mixed content errors:

  • Use a plugin like “Really Simple SSL” to automatically detect and fix mixed content by rewriting HTTP URLs to HTTPS.
  • Manually search for and replace any HTTP links in your website’s content, themes, or plugins with HTTPS.

3. SSL Certificate Expired

An expired SSL certificate can lead to warnings about an insecure connection. Renewing your SSL certificate on time is crucial. Most hosting providers offer auto-renewal features, so enabling this option can prevent the issue.

4. SSL Certificate Domain Mismatch

This error occurs if the SSL certificate does not match the domain name it’s installed on. To correct this:

  • Double-check the certificate’s details to ensure it covers your domain, including any subdomains.
  • For a multisite network or if you’re using subdomains, consider a wildcard SSL certificate.

5. Incomplete SSL Certificate Chain

A missing intermediate certificate can cause SSL errors in some browsers. To address this:

  • Contact your SSL provider to obtain the complete certificate chain.
  • Install the intermediate certificates on your server following your hosting provider’s instructions.

Tools and Resources for Troubleshooting

Several online tools can help identify and diagnose SSL issues:

  • SSL Labs’ SSL Test: An excellent tool for a comprehensive analysis of your site’s SSL configuration and potential vulnerabilities.
  • Why No Padlock?: Useful for identifying mixed content issues on your site.

Best Practices for SSL Management

  • Regularly Monitor Your SSL Certificates: Keep track of expiration dates and renew certificates well in advance.
  • Implement HTTP Strict Transport Security (HSTS): This response header tells browsers to only connect via HTTPS, helping prevent man-in-the-middle attacks and cookie hijacking.
  • Stay Informed: Keep up with the latest security practices and ensure your site’s software, plugins, and themes are up to date.


While encountering SSL errors can be frustrating, understanding their causes and knowing how to address them can greatly enhance the security and performance of your WordPress site. By following the troubleshooting steps outlined in this guide, you can ensure your website remains a trusted and secure place for your visitors. Stay proactive about your site’s security, and you’ll foster a safer internet environment for everyone.

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