[Fix] “Secure Connection Failed” Problem in Mozilla Firefox Web Browser

Today when I was trying to open a few HTTPS websites such as Google, Facebook, Twitter, etc in Mozilla Firefox web browser, I was getting "Secure Connection Failed" error message. None of the HTTPS websites were opening for me. I tried to clear cache and cookies in the browser. I also tried to create a new user profile in Firefox but all in vain. I even tried to completely uninstall and then reinstall Firefox web browser but it didn't help in fixing the annoying issue. I was still receiving "Secure Connection Failed" error message on all HTTPS websites.


After a few minutes of research, finally I was able to fix the problem. The culprit behind this problem was ESET NOD32 antivirus program. If you are also using ESET NOD32 antivirus or security suite and facing "Secure Connection Failed" problem in Mozilla Firefox web browser, this tutorial can help you in solving the issue.

Sometimes ESET security products can't import root certificates properly after installation or upgrading to a new version. When it happens, HTTPS websites with SSL certificates become not accessible and start throwing "Secure Connection Failed" error message in Mozilla Firefox web browser.

To fix this issue, we just need to reset SSL scanning feature in ESET products which can be done with the help of following simple steps:

1. Open ESET product main window by clicking on its icon in system tray.

2. Now press F5 key to launch Advanced Setup window.

3. Now click on Web and Email link in left-side pane and then in right-side pane click on SSL/TLS to expand it.

4. Now you need to turn off "Enable SSL/TLS protocol filtering" option. Click on the slider near the option and it'll set it to 'x' mark which means the option has been disabled.


After turning off the option click on OK button to apply changes.

5. Now again press F5 key to launch Advanced Setup window. Again click on Web and Email link in left-side pane and expand SSL/TLS in right-side pane.

Now turn on "Enable SSL/TLS protocol filtering" option. Click on the slider near the option again and it'll immediately enable the feature.


After turning on the option click on OK button to apply changes.

That's it. Now try to open HTTPS websites in Mozilla Firefox web browser and it'll work fine without any problem.

If the problem still persists, you can try to restart your computer.

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Posted in: Mozilla Firefox, Troubleshooting

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  • Thanks for the info. I had the same problem but with Google Chrome.

  • I have the same problem with Firefox but I am using Kaspersky antivirus program do you have a remedy for that
    thank-you keep up the good work

  • VG

    ^^ Try to disable WWW or similar Internet safety feature in your security program. If it contains any option related to SSL, disable it.

  • I fixed the issue:

    1. Open up Computer and and then Organize and Folder Options.
    2. Make sure you have "Show hidden files, folders, and drives" box checked
    3. Make sure you have "Hide protected operating system files (Recommended)" box unchecked.
    4. Open up Firefox browser and Options, then navigate to Advanced tab and then to Certificates tab.
    5. Click on View Certificates
    6. New window appears, now select Authorities tab and then Import button
    7. Navigate here: C:\ProgramData\Kaspersky Lab\AVP17.0.0\Data\Cert
    8. Now import file called "(fake)Kaspersky Anti-Virus Personal Root Certificate.cer"
    9. New window appears, make sure you check all 3 boxes
    10. Then just hit OK
    11. Try to open up https based website, website opens up correctly

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