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Why Does “Chrome Says Not Secure” but Certificate is Valid?

Why Does Chrome Says Not Secure but Certificate is Valid

You’re browsing the web on Google Chrome and suddenly get a warning that the connection is “Not Secure” even though the certificate is valid. This confusing message can be scary for users concerned about security vulnerabilities or hackers. 

In this article, we’ll explore the possible reasons Chrome may show a site as not secure when the SSL certificate is actually valid. Typically, this error occurs due to mixed content issues, Chrome flags, browser extensions, weak ciphers, or the need to renew your SSL certificate. 

We’ll walk through each of these common problems and explain how to resolve the security warning in Chrome so your site shows as secure for users again. 

By the end, you’ll understand why Chrome says “Not Secure” even with a valid certificate and learn how to troubleshoot each cause. With web security top of mind for many internet users today, it’s important for site owners to understand these Chrome messages to maintain user trust and confidence.

What Does “Chrome Says Not Secure” Mean?

When you visit a website in Google Chrome, the browser assesses the website’s security. If Chrome detects potential security risks, it displays a “Not Secure” warning next to the URL in the address bar. This message can deter visitors from proceeding further on your website, impacting your site’s credibility and user trust.

The Importance of HTTPS

Before delving into why you might receive the “Not Secure” message, it’s essential to understand the significance of HTTPS. HTTPS (Hypertext Transfer Protocol Secure) encrypts the data exchanged between your website and its visitors. This encryption protects sensitive information, such as login credentials, payment details, and personal data, from potential hackers.

Reasons for the “Not Secure” Warning

Missing SSL Certificate

One common reason for the “Not Secure” message is the absence of a valid SSL certificate. To resolve this, ensure that you have correctly installed an SSL certificate from a reputable Certificate Authority (CA). An SSL certificate acts as a digital passport for your website, and without it, your connection is not secure.

Mixed Content

Another reason for the warning is mixed content. This occurs when your website has both secure (HTTPS) and non-secure (HTTP) elements. It’s crucial to ensure that all website resources, such as images and scripts, are loaded via HTTPS. Mixed content can create a vulnerability where attackers can manipulate the non-secure parts of your website, posing a risk to user data.

Expired Certificate

If your SSL certificate has expired, Chrome will mark your site as “Not Secure.” Regularly check and renew your certificate to avoid this issue. An expired certificate indicates to Chrome that the security of your website is not up to date and cannot be trusted.

Valid SSL Certificate But “Not Secure” Message

Sometimes, even with a valid SSL certificate, you may still receive the “Not Secure” message. Here are a couple of reasons why this might happen:

Incomplete SSL Chain

Ensure that your SSL certificate is installed with the complete certificate chain. Missing intermediate certificates can trigger the warning. The certificate chain establishes a connection of trust from your SSL certificate to a trusted root certificate. An incomplete chain means there’s a gap in this trust connection, which Chrome detects as a security concern.

Browser Cache Issue

Your browser might have cached an older version of your website, which can lead to the “Not Secure” message. Clear your browser cache to see if the issue persists. Browser cache stores copies of web pages to load them faster, but outdated cached versions may not reflect your current secure configuration.

How to Check the SSL Certificate

To verify the status of your SSL certificate, you can use online tools or browser features. Browsers like Chrome provide information about the certificate when you click on the padlock icon next to the URL. This feature allows you to see details about the certificate’s validity and chain.

How to Resolve the Issue

If your website is displaying a “Not Secure” message, follow these steps to rectify the problem:

  1. Ensure SSL Certificate Is Installed Properly: Double-check that your SSL certificate is correctly installed on your web server. A proper installation ensures that Chrome recognizes your website as secure and trustworthy.
  2. Update SSL Certificate: If your certificate is expired or nearing expiration, renew it with your CA. Keeping your certificate up to date is essential to maintaining a secure connection.
  3. Clear Browser Cache: Clear your browser’s cache to ensure it loads the latest version of your website. This ensures that any outdated information or non-secure elements are removed.
  4. Update Your Website: Ensure that all website elements are loading via HTTPS, and there’s no mixed content. Consistently updating your website to use secure connections is vital.
  5. Force HTTPS: Configure your web server to enforce HTTPS by default. This ensures that all visitors are directed to the secure version of your website.
  6. Redirect HTTP to HTTPS: Use 301 redirects to ensure all traffic is directed to the secure HTTPS version of your website. This prevents users from accessing your site through an insecure connection.
  7. Mixed Content Fix: Identify and update any resources that are loaded over HTTP to use HTTPS. Fixing mixed content issues is crucial to maintaining a secure website.


A “Not Secure” message in Chrome can harm your website’s reputation and deter users. However, with the right knowledge and actions, you can resolve this issue even if your SSL certificate is valid. 

By ensuring your SSL certificate is correctly installed, addressing mixed content issues, and staying proactive about certificate expiration, you can provide a secure browsing experience for your visitors.


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