SEC_ERROR_UNKNOWN_ISSUER: How to Fix Mozilla Firefox “Connection is not secure” Issue?

SEC_ERROR_UNKNOWN_ISSUER: How to Fix Mozilla Firefox “Connection is not secure” Issue?

As we all know that Mozilla Firefox is one of the best browsers as it ensures the complete safety of the browsing activities that the users practice on it. The website which is considered to be safe and secured opens with https:// as the prefix of its URL. And, based on that, the Firefox validates if the particular website is worth opening or not. If the website is not validated and you try to open it, the Firefox will show you the “Connection is not secure” Error. You might also come across the SEC_ERROR_UNKNOWN_ISSUER message. In this article, we will discuss different aspects related to the same along with some troubleshooting tips.

What is SEC_ERROR_UNKNOWN_ISSUER Error of Mozilla Firefox?

In general cases, the validation is provided by a verified authority to a website in order to ensure that the user is connected to an intended target and it is properly encrypted. But, in odd circumstances, the user might come across this SEC_ERROR_UNKNOWN_ISSUER: Connection is not secure Error in Mozilla Firefox. The main reason behind this issue is that the Firefox browser is still unaware of the validation or certificate that has been provided by the authority. So, it cannot be considered as trusted. As a result, the user faces this error. The problem becomes quite evident if you have recently updated, installed or upgraded the browser to its latest versions.

How to fix SEC_ERROR_UNKNOWN_ISSUER: Connection is not Secure Error in Mozilla Firefox?

The only way to deal with this problem is disable the SSL Scanning function of the antivirus that you are using on your system. No matter which antivirus program are you using, the process is almost similar. However, there is a slight variation as well. So, to avoid any issue, we have come up with the steps for all the major antivirus programs.

1. If you are a Kaspersky Antivirus User:

  • At first, you need to open the Kaspersky Antivirus program
  • Now, you are supposed to click on the “Settings” tab
  • In the next step, you need to go to “Additional” option
  • Later, you are required to click on the “Network” option
  • As you move on to the next step, you need to go to the “Network Settings” page, which is available just under the encryption connection
  • Also, it is important for you to choose the “Do not scan encrypted connection.”

2. If You are an Avast Antivirus User:

  • Open the dashboard as soon as possible
  • Go to “Settings” option
  • Now, you need to navigate to the “Protection” option
  • After the above steps, you need to click on “Customize” option
  • You will get the customize option, just beside the web shield

Later, you will get the settings for Enable HTTPS scanning, make sure that you have unchecked its box

3. If you are a BitDefender User:

  • At first, you need to open the dashboard of BitDefender program
  • Click on “Modules”
  • Click on “Protection”
  • Next, you are supposed to click on “Web Protection.”
  • In the end, all you need to do is to toggle off the “Scan SSL” option

You Need to Add Exceptions (ONLY IF THE WEBSITE PERMITS)

It is a good idea to set up the exception. But, this could only be possible, if the website permits you to do so. And, just in case, it allows, you need to follow the following steps:

  • Click on “Advanced”
  • Click on “Add Exceptions”
  • “Add Security Exception” window will get opened in front of you
  • Click “Get Certificate” option
  • Click on “Confirm”
  • Restart the “Firefox”

How to Troubleshoot “Connection is not Secure” in Mozilla Firefox Permanently?

If you want to troubleshoot this problem permanently, you should get help of the experts now. Simply pick up your phone now and dial Mozilla Firefox phone number. You can quickly get this number from a verified platform of Contactforhelp.


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