How to Fix “Mixed Content Warning” on WordPress | Guide 2024

Are you encountering a mixed content warning on your WordPress site? Addressing these issues is crucial, as they can impact your site’s security, user trust, and search engine rankings. 

Here’s a comprehensive guide to understanding and resolving mixed content warnings effectively. 

What is the Mixed Content Error in WordPress?

The WordPress mixed content warning occurs when your WordPress website loads some or all of its content (such as images, scripts, and stylesheets) through unsecured HTTP connections while the site itself is served over HTTPS.

This mismatch triggers a warning in users’ browsers, typically displayed as a ‘Not Secure’ indicator or a padlock icon with a warning triangle. This issue is prevalent in Google Chrome, Microsoft Edge, Mozilla Firefox, and other major browsers.

While the mixed content warning may not visibly affect your site’s appearance, the associated ‘Not Secure’ label can significantly impact user trust and SEO rankings. Addressing this warning is essential to maintain a secure and reputable online presence. Utilizing the best WordPress-managed hosting can also help mitigate such issues by providing enhanced security features and support.

How to Fix the Mixed Content Error in WordPress?

Resolving mixed content errors involves identifying and updating insecure HTTP links to secure HTTPS links throughout your site. Here’s a detailed approach to fix this issue:

Step 1: Identify the Causes of Mixed Content

1. Check Your SSL Certificate: Check to make sure your SSL certificate is really valid and set up correctly. Turn to tools such as Qualys SSL Labs or IONOS SSL Checker to check certificate details and expiration dates.
2. Browser Developer Tools: For technical users, browser developer tools (like Inspect Element) can identify specific HTTP requests causing mixed content warnings.

1. Mixed content warnings may persist if your pages still contain HTTP elements. To find mixed content warnings, inspect the content on your page and use tools to identify the mixed content. For additional insights on handling SSL-related issues, you might find it helpful to read about how to fix ERR_SSL_VERSION_OR_CIPHER_MISMATCH errors.

Step 2: Use Plugins to Fix Mixed Content

Using WordPress plugins simplifies converting HTTP links to HTTPS across your site. Forcing WordPress to use the SSL Insecure Content plugin helps ensure that all content on your site is delivered securely.

Addressing these content warnings on your site is crucial for maintaining the integrity and security of your content delivery:

Installing an SSL certificate is the main step, but you must also confirm that the mixed content issue is resolved by checking your website for mixed content.

Install SSL Insecure Content Fixer Plugin: Activate and configure this plugin to automatically detect and update HTTP links within your WordPress site. Adjust settings based on the level of customization needed (Simple to Capture All).

Step 3: Manually Fix Plugins and Themes

If plugins or themes continue to load content over HTTP, manually update them:

• Update Plugins/Themes: Ensure all plugins and themes are updated to versions that support HTTPS.

• Edit Theme Files: Use the Theme Editor in WordPress to modify hardcoded URLs from absolute HTTP paths to relative paths or HTTPS URLs.

If the plugin or theme is fixed manually, then this can fix mixed content issues that automated plugins or themes might not deal with altogether. In particular, it is a process of looking through the URLs in your plugin and theme files and updating them to use HTTPS. While during this process no files shall be corrupted, refer to common ways on how to fix corrupted files in WordPress if something gets corrupted.

Step 4: Replace HTTP Links in JavaScript and Media Files

• Search and Replace: Use tools like Better Search Replace to find and replace HTTP links in static JavaScript, media files, and database entries.

Step 5: Force HTTPS Redirection

Ensure all traffic to your site is redirected from HTTP to HTTPS to prevent mixed content errors:

• Edit Server Configuration: Depending on your server (Apache or nginx), modify the .htaccess or nginx.conf file to enforce HTTPS redirection. Use SSH or FTP to access and edit these files securely.

Step 6: Thoroughly Test Your Site

After implementing fixes, thoroughly test your WordPress site:

• Clear Caches: Make sure your content is secure by clearing the WordPress, plugin, and browser cache first.
• Cross-browser Testing: Test your site across multiple browsers and devices to verify there are no lingering mixed content warnings.

• Backup Your Site: You should take backups prior to and after a change and use tools such as BlogVault to make a backup of them, and if something goes wrong, you could restore them if needed.

Preventing Mixed Content in WordPress

To prevent future mixed content warnings:

• Use Relative URLs: Prefer relative URLs in content, theme files, and custom code to adapt to the current page protocol (HTTP or HTTPS).
• HTTPS External Resources: Link to external resources (scripts, stylesheets, images) using HTTPS whenever possible. Consider hosting resources locally if HTTPS isn’t supported.
• Monitor SSL Expiry: SSL certificate expiration dates must be kept track because of the unsecured connections.
• Regular Updates: To patch vulnerabilities and be compatible with HTTPS, update WordPress core, plugin, and theme regularly.

Impact of Mixed Content Warnings

Mixed content warnings can impact your WordPress site negatively:

• Security Risks: To handle mixed content, passwords, and other sensitive user information may be exposed to attackers and vulnerability to site security.
• Trust and SEO: Users may perceive your site as untrustworthy if marked ‘Not Secure’, leading to lower engagement and potential SEO penalties from search engines.

• Access Restrictions: The fact that some browsers may block access to such sites with mixed content might negatively affect user accessibility as well as the measurable performance of a site.

Enhancing WordPress Site Security

Beyond fixing mixed content issues, enhance your WordPress site’s security:

• Install Security Plugins: Consider plugins like MalCare for comprehensive malware detection, removal, and firewall protection.
• Regular Maintenance: Keep strong passwords, enable two-factor authentication, and be careful of too many login attempts. Secondly, they should offer you DDoS hosting protection for your site against distributed denial of service (DDoS) attacks.

Final Thoughts

When you see a mixed content warning on your WordPress site, it often indicates that there are content delivery issues on your WordPress installation. This mixed content warning appears when parts of your site are delivered over HTTP instead of HTTPS.

To address mixed content warnings, use the SSL Insecure Content plugin to force WordPress to load all content over HTTPS.

Implement best practices for HTTPS usage, regularly update your site, and use security plugins to safeguard against potential threats. A secure site protects user data, fosters a positive user experience, and supports long-term growth and visibility online. 

FAQs

What is an example of mixed content?

Mixed content includes any HTTP-loaded resources (images, videos, scripts) on an HTTPS site. Browser developer tools can identify these inspect elements and locate insecure HTTP requests.

Does mixed content affect SEO?

Yes, mixed content warnings impact SEO by affecting user trust and site accessibility. Google considers HTTPS a ranking factor, and mixed content can lead to lower search rankings and reduced organic traffic.

Why use HTTPS instead of HTTP?

HTTPS encrypts data transmitted between users and your site, protecting it from interception. Unlike HTTP, HTTPS secures sensitive information (like passwords and payments) and enhances site security. Read our guide on how to fix your connection is not private error for more tips on securing your site.