Windows

Fix: Your Connection is not Secure Firefox

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Whenever Firefox connects to a secure website, it verifies that the certificate presented by the website is valid and the encryption is strong enough to protect your privacy. If the certificate cannot be validated or the encryption is not strong enough, Firefox will not proceed with the browsing and display an error message instead.

Sometimes this error message can be legit and should of concern to you. However, if you are encountering this error on multiple popular websites such as Google, Facebook, Bing etc; you can take a look at the workarounds listed and see if any work in your case.

Solution 1: Setting Correct Time and Date

If your computer’s time is not accurate, it will cause a discrepancy while checking and verifying several certificates and will cause Firefox to throw an exception and display the error message. You will most probably also be prompted on the error page after you click ‘advanced’. If you have set the time to be automatically set or if the time is incorrect, follow the steps listed and see if this solves the problem.

  1. Press Windows + R, type “control” in the dialogue box and press Enter.
  2. Once in control panel, select “Date and Time” or “Clock and Region” according to the type of control panel selected.

  1. Once the clock is opened, click “Change date and time”. Now set the correct time and also select the correct region.

  1. Press ‘Apply’ after implementing all the changes and check if you can successfully browse the website without any errors.

RELATED: Safari can’t establish a secure connection to the server

Solution 2: Disabling Antivirus Software

There are several antivirus software which provides an additional layer of security to your browser. This extra layer of security might sometimes conflict with the existing layers in the browser and thus cause the error message under discussion.

The detailed error message, in this case, is “SEC_ERROR_UNKNOWN_ISSUER”. You can probably resolve this issue by disabling SSL or browser scanning from your computer through your antivirus.

In this solution, you have to explore yourself and see if there are any settings in your antivirus which might be proving that extra layer. Basically, you are looking for anything which monitors your internet activity.

If you are unable to still fix the problem, you can disable the antivirus completely. You can check our article on How to Disable your Antivirus. Restart your computer after disabling and see if you can access the sites without any problem.

Solution 3: Changing ‘security.enterprise_roots.enabled’

There is a setting in Mozilla Firefox where the browser will trust certificates in the Windows certificate store shared by other browsers such as Explorer, Chrome, or Safari etc. This helps in cases where you do not have complete access to your computer and there are some certificates which are being impossible to import by Firefox on its own. We will change this setting and see if this fixes the problem.

  1. Open Firefox and type “about:config” in the address area and press Enter.
  2. Now when the search bar appears at the top of the window, type “root” in the dialogue box and wait for the results to be populated.
  3. Select the option “enterprise_roots.enabled”. Right-click it and select “Toggle”. This will enable the value which was first false.

  1. Now try opening any web page and see if you can access without any problems. Do note that you might get a prompt about the warning associated with changing the preferences. Ignore the warning and continue the solution.

Solution 4: Disabling SSL3 Preferences

If the above methods don’t work out as expected, we can change the setting of SSL in the preferences and see if the problem gets solved. We will also tweak minor changes while carrying out the solution.

  1. Open Firefox and type “about:config” in the address area and press Enter.
  2. Now when the search bar appears at the top of the window, type “ssl3” in the dialogue box and wait for the results to be populated.
  3. Change both values to “false” by toggling the key.

PRO TIP: If the issue is with your computer or a laptop/notebook you should try using the Reimage Plus Software which can scan the repositories and replace corrupt and missing files. This works in most cases, where the issue is originated due to a system corruption. You can download Reimage Plus by Clicking Here
  1. Now select the menu icon present at the top-right side of the window and click “Help” and then “Troubleshooting Information”.

  1. Now under the heading “Application Basics”, click “Open folder” in front of Profile Folder.

  1. Now run the Data Base Files of “cert8.db” and “cert9.db” for them to be updated. You need to close Mozilla Firefox first before running the files.

  1. Now open Firefox and check if you can access the websites without any problems.

Solution 5: Enabling “auto-detect proxy” and Refreshing Mozilla

If all the above methods don’t work, we can try enabling the “auto-detect proxy server on this network”. It is possible that you are using a proxy server in some organization or through your ISP without you knowing. Enabling this option will automatically detect such server and make changes to the configuration accordingly.

  1. Press the menu icon on the top-right side of the window. Now select “General” and click “Settings” under the heading of “Network Proxy”.

  1. Now select the option “Auto-detect proxy settings for this network”. Save changes and exit.

  1. Restart Mozilla Firefox and see if this fixes the problem.

If this doesn’t fix the issue, we can try resetting Firefox and see if this brings out about any change. Do note that all your existing settings and bookmarks will be deleted along with the history. Proceed after backing up everything.

  1. Navigate to troubleshooting information as shown in the earlier steps. Click “Refresh Firefox” present at the right-end.

  1. Restart your computer. Also make sure that there is no antivirus software running on your computer such as AVG, Kaspersky etc. After disabling them, check again if the issue is fixed.

Method: Adding Exception for a Single Website

If you are only encountering this error for a single website, you can an exception despite the additional risks involved. Normally, this isn’t the course of action recommended but if you are well aware of the website’s infrastructure and know for certain that there are no risks involved, you can easily make an exception and access it like a regular website.

  1. Open the website you want to access which gives you the error message. Click Advanced and then select Add Exception.

  1. A new dialogue box will pop up. Confirm the security exception after clicking the action box and see if you can access the website without any problems.

Tips:

  • Try accessing the website in Mozilla on other systems. You can also make sure that the problem lies with the website by checking it in other browsers.
  • Check the behavior after making a new administrator account.
  • If the problem pertains only in computers present in your network, contact your ISP/Network administrator.
  • If you are having problems accessing websites despite all the steps mentioned, you can always consider exporting your data and replacing Mozilla with other browsers out there.

PRO TIP: If the issue is with your computer or a laptop/notebook you should try using the Reimage Plus Software which can scan the repositories and replace corrupt and missing files. This works in most cases, where the issue is originated due to a system corruption. You can download Reimage Plus by Clicking Here

RECOMMENDED: Click here to fix Windows errors and optimize system performance

Kevin Arrows

Hi! I'm Kevin. Thank you for reading the article above. I am a certified MCTS (Microsoft Certified Technology Specialist) with over 10 years of experience. I love to address tech issues, and write tech how-to's in a way that it can be followed by everyone.

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Fix: Your Connection is not Secure Firefox

If the issue is with your Computer or a Laptop you should try using the Reimage Plus Software which can scan the repositories and replace corrupt and missing files. This works in most cases, where the issue is originated due to a system corruption. You can download Reimage Plus by clicking the Download button below.

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