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How to Resolve ‘Failed to Load Resource: net::ERR_SSL_PROTOCOL_ERROR? – Survival Guide for Webmasters

How to Resolve 'Failed to Load Resource netERR_SSL_PROTOCOL_ERROR - Survival Guide for Webmasters

Getting the “Failed to Load Resource: net::ERR_SSL_PROTOCOL_ERROR” error when trying to access a website can be frustrating. This error typically appears when there is a security certificate issue that prevents your browser from establishing a secure SSL/TLS connection with the web server. 

In this post, we’ll walk through the common causes of the net::ERR_SSL_PROTOCOL_ERROR error and provide some troubleshooting steps to resolve it. 

Whether the issue is an expired certificate, mismatch between the certificate and site domain, or other SSL handshake problem, we’ve got the solutions you need to get rid of this error and securely access the website again. 

Read on to learn how to troubleshoot and fix the net::ERR_SSL_PROTOCOL_ERROR on your end, so you can get back to browsing without interruption.

Understanding the net::ERR_SSL_PROTOCOL_ERROR

Before we dive into the solutions, let’s first grasp what the ‘Failed to Load Resource: net::ERR_SSL_PROTOCOL_ERROR’ error entails. This error occurs when a web page tries to load resources over a secure (HTTPS) connection but encounters an issue with the SSL/TLS protocol. 

t can manifest as a broken padlock icon in the browser’s address bar or an error message, and it’s a cause of concern for webmasters because it can deter visitors and impact search engine rankings.

Common Causes of net::ERR_SSL_PROTOCOL_ERROR

Expired SSL Certificate: An expired SSL certificate is a frequent culprit. It’s essential to keep track of your certificate’s validity and renew it in a timely manner.

Mismatched SSL Certificate: If the SSL certificate doesn’t match your website’s domain, browsers will trigger the error. Ensure your certificate is correctly configured.

Mixed Content: When a web page loads both HTTP and HTTPS resources, it can lead to this error. Make sure all resources are served securely.

Outdated Browser: Sometimes, the user’s browser is outdated and doesn’t support the latest SSL/TLS protocols. Encourage visitors to keep their browsers up to date.

Steps to Resolve ‘Failed to Load Resource: net::ERR_SSL_PROTOCOL_ERROR’

Now, let’s explore the steps to resolve this error and ensure your website functions seamlessly.

1. Renew or Replace the SSL Certificate

The security of your website starts with a valid SSL certificate. It’s not just the foundation; it’s the cornerstone of a secure online presence. Here’s what you need to do:

  • Check for Expiry: Regularly monitor the expiration date of your SSL certificate. It’s essential to ensure it remains valid. If it’s about to expire or has already expired, renew it immediately. Many domain registrars and certificate authorities provide timely reminders to help you stay on top of this.
  • Matching Domain: Ensure that the SSL certificate matches your website’s domain. A common cause of the ‘Failed to Load Resource: net::ERR_SSL_PROTOCOL_ERROR’ is a mismatch between the certificate and the domain it’s protecting. If they don’t align, obtain a new SSL certificate that precisely matches your domain.

2. Check for Mixed Content

Mixed content is one of the silent culprits behind SSL protocol errors. It happens when your website loads both secure (HTTPS) and insecure (HTTP) resources. To tackle this issue:

  • Resource Audit: Conduct a comprehensive audit of your website’s resources. Pay special attention to elements such as images, scripts, and stylesheets. Make sure all these elements are loaded via HTTPS. If you encounter any insecure (HTTP) links, correct them immediately.
  • Content Security Policies (CSP): Implement Content Security Policies on your website. These policies can be configured to prevent the loading of mixed content, providing an additional layer of security against the ‘Failed to Load Resource: net::ERR_SSL_PROTOCOL_ERROR’.

3. Update Your Server and Software

Outdated server software and content management systems can create compatibility issues with the latest SSL/TLS standards. Keeping your server and software up to date is critical for addressing this problem:

  • Software Updates: Regularly check for updates to your web server software (e.g., Apache, Nginx) and your content management system (e.g., WordPress, Joomla). Updates often include patches and improvements related to SSL/TLS compatibility. Apply updates promptly.
  • Plugin and Extension Updates: If you’re using any plugins or extensions, ensure they are also up to date. Outdated plugins can introduce vulnerabilities and impact SSL/TLS functionality.

4. Verify the SSL/TLS Configuration

Your SSL/TLS configuration plays a pivotal role in maintaining a secure connection. Incorrect configurations can lead to the ‘Failed to Load Resource: net::ERR_SSL_PROTOCOL_ERROR’. To rectify this:

  • Configuration Check: Verify the settings of your SSL/TLS configuration. Ensure that the protocols, ciphers, and certificates are correctly set up. Misconfigurations can disrupt the handshake between your server and the user’s browser, causing the error.
  • Consult Hosting Provider: If you’re unsure about the SSL/TLS configuration, don’t hesitate to seek guidance from your hosting provider. They can offer assistance and provide recommendations to optimize the settings for a secure connection.

5. Educate Your Visitors

While you’re addressing technical aspects on your end, it’s equally important to educate your website visitors about their role in maintaining a secure browsing experience:

  • Browser Updates: Encourage your visitors to keep their web browsers up to date. Outdated browsers may not support the latest SSL/TLS protocols, which can lead to security issues. Provide clear instructions and links for them to update their browsers.
  • Security Awareness: Share information about online security and the importance of HTTPS. Educated visitors are more likely to understand and appreciate the security measures you’ve put in place.

6. Monitor and Test Regularly

Once you’ve successfully resolved the ‘Failed to Load Resource: net::ERR_SSL_PROTOCOL_ERROR’ issue, your job isn’t done. Continuous monitoring and testing are vital:

  • Website Monitoring: Implement a robust website monitoring system that checks the status of your SSL certificate, encryption, and overall website security. This proactive approach allows you to detect and address any potential SSL protocol errors promptly.
  • Periodic Testing: Regularly conduct security testing on your website. This includes vulnerability scans and SSL/TLS checks. By routinely assessing your website’s security, you can identify and resolve any emerging issues before they impact your visitors.


In the digital realm, maintaining a secure and error-free website is paramount. The ‘Failed to Load Resource: net::ERR_SSL_PROTOCOL_ERROR’ error can be a roadblock in achieving this goal, but with the right knowledge and proactive measures, webmasters can overcome it. 

By renewing or replacing SSL certificates, addressing mixed content issues, keeping software up to date, verifying SSL/TLS configurations, educating visitors, and conducting regular testing, you can ensure a seamless online experience for your users.


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