How to Fix “content was blocked because it was not signed by a valid security certificate” on Internet Explorer

When browsing the Internet using Internet Explorer, you may encounter an error message stating that “Content was blocked because it was not signed by a valid security certificate.” This error occurs when the browser cannot verify the security certificate of the website you are trying to access.

The browser is designed to block such content as a security measure to protect your information. In this guide, we will provide step-by-step instructions on how to fix this error in Internet Explorer.

Step 1: Check Your Computer’s Date and Time

Incorrect system date and time can cause issues with security certificates. Make sure your computer’s date and time settings are accurate.

1. Right-click on the date and time in the taskbar.
2. Select “Adjust date/time.”
3. Ensure the date and time are correct. If not, adjust them accordingly.

Step 2: Clear SSL State

Clearing the SSL state can resolve issues related to SSL certificates.

1. Open Internet Explorer.
2. Click on the gear icon in the upper-right corner and select “Internet Options.”
3. Go to the “Content” tab.
4. Click on the “Clear SSL State” button.
5. Click “OK” to confirm.

Step 3: Disable Certificate Address Mismatch Warning

Disabling the certificate address mismatch warning can resolve the issue if the website’s certificate has a minor mismatch.

1. Open Internet Explorer.
2. Click on the gear icon in the upper-right corner and select “Internet Options.”
3. Go to the “Advanced” tab.
4. Scroll down to the “Security” section.
5. Uncheck the box next to “Warn about certificate address mismatch.”
6. Click “Apply” and then “OK.”

Step 4: Add the Website to Trusted Sites

Adding the website to the list of trusted sites can help bypass certificate errors.

1. Open Internet Explorer.
2. Click on the gear icon in the upper-right corner and select “Internet Options.”
3. Go to the “Security” tab.
4. Click on “Trusted Sites” and then click the “Sites” button.
5. Enter the website’s URL in the “Add this website to the zone” field and click “Add.”
6. Click “Close” and then “OK.”

Please note that these steps may reduce the level of security provided by your browser. Proceed with caution and only for websites you trust.

The Outcome

By following these steps, you should have resolved the “Content was blocked because it was not signed by a valid security certificate” error on Internet Explorer. The website should now load correctly without the error message. However, be cautious when bypassing security warnings, as they are designed to protect your information.

We hope this guide has been helpful in fixing the security certificate error on Internet Explorer. If you have any suggestions or improvements, please feel free to leave a comment below.