How To Fix The ERR_SSL_PROTOCOL_ERROR

You’re trying to access your website and see the “ERR_SSL_PROTOCOL_ERROR” message instead/ It’s not a good look. It’s a loud message to the readers that something is wrong.

The error indicates a problem with the Secure Sockets Layer (SSL) connection on your site. This error can block users from accessing your website securely, interrupting your work or projects.

The good news is that it’s an easy fix. It takes some basic WordPress troubleshooting. We’ll walk you through it all.

What is the ERR_SSL_PROTOCOL_ERROR?

The “ERR_SSL_PROTOCOL_ERROR” in WordPress is a common issue tied to how you installed an SSL certificate.

An SSL certificate is a digital document that is vital for a secure connection over the internet. When a user’s browser requests to connect to a server via HTTPS, the server replies with an SSL certificate. The browser then verifies this certificate the connection between the two is now encrypted. The error simply means that there is an issue with verifying the certificate and establishing the connection.

There are several factors that can cause the ERR_SSL_PROTOCOL_ERROR:

The SSL certificate might not be properly installed
The certificate has expired and needs to be renewed
Mixed content warnings because it is an HTTP page
An outdated browser or cached data causing conflicts.
The server might not be correctly set up to manage HTTPS

How to fix the “ERR_SSL_PROTOCOL_ERROR” error?

Knowing the causes is only half the battle. The other half is resolving the error. In the next section, we’ll guide you through simple steps to troubleshoot and resolve this error. 

1. Verify SSL certificate

The first step is to check the SSL certificate to fix the ERR_SSL_PROTOCOL_ERROR. Ensure the certificate is valid and not expired. Also, confirm it is installed correctly on your server. This step is crucial to maintain your site’s security and protect data.

Use tools like Qualys SSL Labs. Go to the Qualys SSL Labs test site and enter your website’s URL. The tool will analyze your SSL certificate for potential issues, including installation and validity. It provides a detailed report identifying what might be wrong.

If your SSL certificate has expired, contact your SSL certificate provider to purchase a new certificate. Once renewed, ensure it is installed correctly on your server. 

2. Correct mixed content issues

Mixed content occurs when a website loaded over HTTPS also tries to load resources over HTTP. This means a secure page is trying to load something unsafe, which can lead to errors and security warnings for visitors. It also throws errors like the  “Was Loaded Over HTTPS, But Requested An Insecure Script” error. 

To fix it, you have to identify the problematic HTTP content and change it HTTPS. This could be images, scripts, videos, etc. This can be challenging and tedious if done manually. You have to go through every page and change them individually. If it sounds painstaking, it’s cause it is. It is prone to errors too. For this reason, we recommend using a plugin like Really Simple SSL.

Really Simple SSL will automatically detect your website’s settings and configure it to run over HTTPS. This includes the automatic conversion of any HTTP URLs to HTTPS. You will fix the mixed content error in minutes. 

3. Review the .htaccess File

Another essential step in addressing the ERR_SSL_PROTOCOL_ERROR is ensuring that your site’s .htaccess file is configured for HTTPS. This file plays a crucial role in managing how URLs are handled on your server, including redirecting HTTP requests to HTTPS.

This helps ensure that any request to your site automatically redirects to the secure HTTPS version. If this configuration is missing or incorrect, it can lead to mixed content issues and compromise your site’s security.

Pro tip: Take a backup before you get started. 

Here’s how to do that:

1. Access your .htaccess file: You can access the .htaccess file through your WordPress hosting account’s file manager or by using an FTP client.
2. Add HTTPS redirection rules: To redirect all HTTP traffic to HTTPS, add the following code to your .htaccess file at the beginning:

/code

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
</IfModule>

3. Save and test: Once you’ve added the code, save the .htaccess file and test your site to ensure that it correctly redirects to HTTPS.

4. Update WordPress, themes and plugins

When WordPress core, themes, or plugins are outdated, they can conflict with newer security protocols, including SSL/TLS. This lack of compatibility can trigger errors such as the ERR_SSL_PROTOCOL_ERROR, as older versions might not support current encryption standards.

While updates are important for maintaining site security and functionality, they also carry the risk of introducing new plugin conflicts or issues. An update might break a feature or a plugin. This is why some site admins hesitate to update promptly.

To manage this paradox, it’s wise to test updates on a staging site before applying them to your live site. A staging site is a copy of your website where you can safely test changes without affecting your live environment. 

Expert tip: If your plugins and themes don’t have an HTTPS friendly version, it might be time to consider finding a replacement. 

5. Clear browser cache

Clearing your browser’s cache can be a helpful step in resolving the ERR_SSL_PROTOCOL_ERROR. Cached data can sometimes cause conflicts, particularly if your browser retains outdated information about your site’s security settings. By clearing the cache, you instruct your browser to fetch the latest version from the server, which can resolve lingering errors.

The process to clear the cache varies based on the browser you’re using. For this tutorial, we will focus on instructions for Google Chrome, a widely used browser.

1. Open chrome settings: Click on the three dots in the upper right corner of the browser window to open the menu, and select Settings.
2. Access privacy and security: In the settings menu, select Privacy and security from the sidebar.
3. Clear browsing data: Click Clear browsing data. In the dialog box that appears, choose the Time range for which you want to clear the cache. To remove all stored data, select All time.
4. Select cached images and files: Ensure the Cached images and files option is checked, then click Clear data.

6. Contact the hosting provider

If you’ve gone through all the steps—checking the SSL certificate, fixing mixed content issues, reviewing the .htaccess file, updating WordPress and plugins, and clearing browser cache—and the ERR_SSL_PROTOCOL_ERROR persists, it’s time to reach out to your hosting provider.

Depending on which hosting provider you choose, you can offer insights and support that go beyond what you can access. They have the tools to diagnose server-side issues, such as misconfigurations or firewall settings that could be interfering with SSL connections. Additionally, they can verify server logs for errors you might not have visibility into.

When contacting your hosting provider, make sure to:

1. Talk about what error you’re seeing and what triggered it
2. Explain the troubleshooting steps you’ve already taken
3. Ask them to check if the server is properly configured for SSL/TLS protocols.
4. Verify if there are any server-side blocks or firewalls affecting SSL connections.
5. Ensure that your SSL certificate and domain settings are correctly synced 

How to prevent the “ERR_SSL_PROTOCOL_ERROR”?

After fixing the error, it’s important to shift focus toward prevention. Ensuring that this error doesn’t recur involves taking proactive steps to maintain your site’s SSL setup. 

In this section, we’ll discuss key practices that help prevent future SSL-related issues. 

• Implement an SSL monitor: An SSL monitor will regularly review your site’s SSL certificate validity. If an expiry date is approaching, it will send you notifications to remind you. This reduces the chance the forgetting to renew the certificate. 
• Use trusted SSL certificate providers: Choosing reputable Certificate Authorities (CAs) guarantees high standards of security and encryption. Reliable CAs help prevent errors related to inadequately secured connections.
• Enable auto-renewal for SSL certificates: Configuring auto-renewal minimizes the risk of expiration-related issues, ensuring your certificates are renewed promptly and automatically, maintaining constant security.
• Keep everything updated: Regular updates to WordPress, including plugins and themes, provide necessary security patches and enhancements. This reduces compatibility issues and prevents SSL-related conflicts.
• Conduct regular site audits: Performing audits helps identify and resolve mixed content issues by ensuring all content loads over HTTPS. This prevents vulnerabilities that could trigger SSL errors.

Final thoughts

The ERR_SSL_PROTOCOL_ERROR is more than just an inconvenience; it highlights a potential gap in your site’s security infrastructure. Addressing and preventing this error is crucial in maintaining the trust and safety of your WordPress site. By implementing the steps we’ve discussed—such as regularly renewing SSL certificates, updating software, and conducting thorough audits—you significantly reduce the risks associated with SSL-related issues.

For ongoing security, consider using comprehensive monitoring tools like BlogVault. These tools provide real-time insights into your site’s performance and security status, allowing you to detect and address vulnerabilities before they escalate into problems. By staying proactive in your site management practices, you ensure a secure and seamless experience for your visitors. Remember, maintaining robust security measures is an ongoing process, essential for the long-term success of your online presence.

FAQs

Written by

Shreya

Shreya has been a writer for as long as she can remember. Now, she writes articles that help WordPress users manage the sites that they're proud of, with little to no coding