Your connection is not secure with Firefox

Every time Firefox connects to a secure website, verifies that the certificate presented by the website is valid and that 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 continue browsing and will display an error message instead.

Your connection is not secure Firefox

Sometimes, this Firefox error message may be legitimate and you should be concerned. However, if you encounter this error on various popular websites like Google, Facebook, Bing, etc., you can take a look at the listed workarounds and see if any of them work for you.

But before continuing with the solutions, Please note that Firefox has a known bug to create this type of problem. For example, visit testsite.com/anypage, will give you this particular error. But if you visit testsite.com first and then open testsite.com/anypage, Firefox will work normally. Make sure it's not your case. What's more, if you are using a VPN, temporarily disable it or change the server of your VPN connection to see if that's the cause of the problem. What's more, you can use any other DNS server like Google DNS to check if your ISP's DNS server is causing the problem.

Solution 1: set the correct date and time

If your computer time is not accurate, will cause a discrepancy when checking and verifying multiple certificates and will cause Firefox to throw an exception and display the error message. Most likely, you will also be asked on the error page after clicking “advanced”. If you have set the time automatically or if the time is wrong, follow the steps below and see if this solves the problem.

1. Press Windows + R, type »control» in the dialog box and press Enter.

2. Once in the control panel, select »Date and time» or »Clock and region» depending on the type of control panel selected. Open date and time settings

3. Once the clock is opened, click on »Change date and time«. Now set the correct time and also select the correct region. Change date and time

4. Press $ 0027 Apply $ 0027 after implementing all the changes and check if you can successfully browse the web without errors.

RELATED: Safari cannot establish a secure connection to the server

Solution 2: disable antivirus software

There are several antivirus programs that provide an additional layer of security to your browser.. This extra layer of security can sometimes conflict with existing layers in the browser and, therefore, cause the error message in question.

The detailed error message, in this case, it is “SEC_ERROR_UNKNOWN_ISSUER”. You can probably solve this problem by disabling SSL or your computer's browser scanning through your antivirus..

In this solution, you should explore yourself and see if there are any settings in your antivirus that may be testing that extra layer. Look for anything that controls your activity on the Internet.

If you still can't fix the problem, you can disable your antivirus completely. You can consult our article on How to deactivate the antivirus. Restart your computer after disabling it and see if you can access the sites without any problem.

Solution 3: change $ 0027security.enterprise_roots.enabled a $ 0027

There is a setting in Mozilla Firefox in which the browser will trust the certificates from the Windows certificate store shared by other browsers such as Explorer, Chrome o Safari, etc. impossible to import with Firefox alone. 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 dialog box and wait for the results to complete.

3. Select the option »enterprise_roots.enabled«. Right-click and select »Toggle«. This will enable the value that was false first. Set the value of enterprise_roots.enabled to True

4. Now try to open any web page and see if you can access it without problems. Please note that you may receive a notice about the warning associated with the change of preferences. Ignore the warning and continue with the solution.

Solution 4: disable SSL3 preferences

If the above methods don't work as expected, we can change the SSL settings in the preferences and see if the problem is resolved. We will also make small changes while we carry 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 dialog and wait for the results to complete.

3. Change both values ​​to »false» by toggling the key. Change the SSL3 values ​​to false

4. Now select the menu icon present at the top right of the window and click on »Help» and then on »Troubleshooting information«. Open troubleshooting information

5. Now, under the title “App basics”, click on “Open folder” in front of the profile folder. Open profile folder

6. Now run the database files »cert8. db »and» cert9.db »to update. You must first close Mozilla Firefox before running the files. Update cert8.db files

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

Solution 5: active “Auto-Detect Proxy” and update Mozilla

If all the above methods don't work, we can try to enable the “automatic proxy server detection on this network”. You may be using a proxy server in some organization or through your ISP without your knowledge. By activating this option, this server will be automatically detected and the corresponding configuration changes will be made.

1. Press the menu icon at the top right of the window. Now select »General» and click on »Settings» under the heading of »Network Proxy«. Open network proxy settings

2. Now select the option »Automatically detect proxy settings for this network«. Save changes and exit. Enable proxy auto-discovery settings for this network

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

If this does not solve the problem, we can try restarting firefox and see if this makes any changes. Please note that all existing bookmarks and settings will be deleted along with the history. Continue after backing up everything.

1. Navigate to the troubleshooting information as shown in the steps above. Click on »Update Firefox» on the far right. Update Firefox

2. Restart your computer. Also make sure no antivirus software is running on your computer like AVG, Kaspersky, etc. After disabling them, check again if the problem is fixed.

Method: add exception for single website

If this error is only found for a single website, you can make an exception despite the additional risks involved. Normally, this is not the recommended course of action, but if you have a good understanding of the website infrastructure and you know for sure that there are no risks involved, you can easily make exception and access it like normal website.

1. Open the web page you want to access which shows you the error message. Click Advanced and then select Add Exception. Add exception for a web page

2. A new dialog will appear. Confirm the Security Exception after clicking the action box and see if you can access the website smoothly. Confirm the security exception

In addition to the above solutions, you can also try:

• Update Windows and Firefox to the latest version available.

• Try to access the Mozilla website on other systems. You can also make sure that the problem lies with the web page by checking in other browsers.

• Use a new Firefox profile or try private browsing.

• You can try using Firefox's private mode.

• Check the behavior after creating a new administrator account.

• If the problem affects only the computers on your network, contact your ISP / Network Administrator.

• If you have trouble accessing the websites despite all the above steps, you can always consider exporting your data and replacing Mozilla with other browsers that exist.