This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

99% of all sites I get message "Secure Connection Failed"

  • 1 reply
  • 1 has this problem
  • 11 views
  • Last reply by FredMcD

more options

99% of all sites I get message "Secure Connection Failed", The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.

How do I stop this? It started when I updated firefox a couple months ago. This issue makes me leary of updating it again

99% of all sites I get message "Secure Connection Failed", The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. How do I stop this? It started when I updated firefox a couple months ago. This issue makes me leary of updating it again

All Replies (1)

more options

What are the exact error messages? More should be listed beside "Secure Connection Failed".

Make sure you are not blocking content.

https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop also see https://blog.mozilla.org/security/2021/03/23/introducing-smartblock/

https://support.mozilla.org/en-US/kb/smartblock-enhanced-tracking-protection


Diagnose Firefox issues using Troubleshoot(Safe) Mode {web link}

A small dialog should appear. Click Start In Troubleshoot(Safe) Mode (not Refresh). Is the problem still there?


Many site issues can be caused by corrupt cookies or cache.

Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.