How to Fix SSL Error “Your Connection is Not Secure” on Mozilla Firefox?

by Ugnius Kiguolis - -
12

Question

Issue: How to Fix SSL Error “Your Connection is Not Secure” on Mozilla Firefox?

Hello. When I attempt to load eBay, I get the “Your Connection is Not Secure” error message. This happens on Firefox only. Why am I getting this error? Do you have any suggestions on how to fix it?

Solved Answer

Many people encounter an SSL error “Your Connection is Not Secure.” It shows on Mozilla Firefox ex exceptionally and may show up unexpectedly and prevents people from accessing one web domain or even a bunch of them.

“Your Connection is Not Secure” error fix

“Your Connection is Not Secure” is called the SSL error and may also be found as SEC_ERROR_UNKNOWN_ISSUER (such code is provided on the error message). SSL or Secure Socket Layers is an Internet Security Protocol, which is used by most banks, social media, and eCommerce sites to protect visitors’ personal and financial information from leak. If the site uses the SSL certificate, its URL address starts with the HTTPS (Hypertext Transfer Protocol Secure), not the normal HTTP. It means that all information that is send or received via the site that uses Internet secure protocol is encrypted.

Unfortunately, websites that use SSL certificate, for example, Facebook, Twitter, PayPal, or eBay may be blocked by the SEC_ERROR_UNKNOWN_ISSUER or “Your Connection is Not Secure” error message. If you are trying to access a site, which is unknown, we would barely recommend ignoring the “Your Connection is Not Secure” alert because the site may contain malware and other unsafe content. However, if you cannot access legitimate domains, which you could access some time ago, the problem may be influenced by the following issues:

  • Incorrect Date & Time settings;
  • Incorrect SSL certificate name;
  • Wrong SSL certificate;
  • The domain contains malicious content;
  • SSL certificate provider is not authorized;
  • Third-party anti-virus or Windows Firewall block the site;
  • The browser got damaged or outdated;

To start with the “Your Connection is Not Secure” fixes, first of all we would recommend disabling your anti-virus and Firewall temporarily. Then install Reimage and run a full system scan with it. It will carefully check the system for malware and internal Windows errors and fix them automatically. If that did not help, open the Date and Time Settings and check if everything is correct. If date or time mismatches, any of the SSL errors may occur. In this case, update the Time and Date to the current time zone the “Your Connection is Not Secure” error should be fixed. If these simple steps did not help to fix Firefox’s problems, please try the methods given below:

A Guide on How to Fix “Your Connection is Not Secure” Error on Firefox

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Fix 1. Remove browsing history on Firefox

  1. Launch Firefox and click on the three horizontal lines at the top-right corner of the screen to open Menu.
  2. Select History and the Clear browsing data.
  3. Select All and click the Clear button.
  4. After that, open Settings and locate the Change Proxy section.
  5. Open Security and Privacy tab and select Medium level.
  6. Finally, close your web browser and re-open it. Try to open the website that showed the “Your Connection is Not Secure” warning.

Fix 2. Exclude SSL protocol scanning in your Antivirus settings

  1. Open your antivirus software and open Set up window.
  2. Navigate to the Advance settingProtocol filteringSSLDo not scan SSL protocol.

This option is not the dead end solution of the SSL error “Your Connection is Not Secure.” It will let you known if the problem has been triggered by the antivirus and encrypted data conflict. If it turns out to be the culprit, we would recommend you to clear Mozilla Firefox’s browsing history or, at best, reset it. Besides, install the latest version of Mozilla Firefox, anti-virus software, and operating system itself. After that, perform the steps indicated above and enable the SSL protocol scanning in your Antivirus settings.

Fix 3. Export and import website’s SSL certificate

  1. Click on the padlock icon, which is placed on the very left side of the URL address.
  2. Click the Export feature button and memorize the location in which the SSL certificate was saved.
  3. Then import the SSL certificate by clicking on it and selecting Options.
  4. Click Advanced -> View certificate -> Import.
  5. Re-open Mozilla Firefox and check if the error has been fixed.

Fix 4. Enable System Restore

If the “Your Connection is Not Secure” error shows up unexpectedly and you can’t remember initiating any system’s changes that would have triggered the problem, try the methods listed above. If none of them helped, then you can try to enable a System Restore Point if, of course, you have had one created some time ago. If you don’t know how to enable it, please refer to this article for instructions.

Fix 5. Disable the “Warn about certificate address mismatch” option

  1. Right-click Windows key and open Control Panel.
  2. Select Internet Options and open Advanced tab.
  3. Locate Security section and open it.
  4. Find the Warn about certificate address mismatch option and uncheck it.
  5. Click Apply and OK to save the changes.
  6. Finally, reboot your PC.

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About the author

Ugnius Kiguolis
Ugnius Kiguolis - The problem solver

Ugnius Kiguolis is the founder and editor-in-chief of UGetFix. He is a professional security specialist and malware analyst who has been working in IT industry for over 20 years.

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