Diễn đàn hỗ trợ Firefox

Secure connection failed and Firefox did not connect Firefox Last updated: 01/16/2024 39% of users voted this helpful

This article explains why you may see a Secure Connection Failed or a Did Not Connect: Potential Security Issue error page, and what you can do.

   If you see a Warning: Potential Security Risk Ahead error page, see What do the security warning codes mean? and How to troubleshoot security error codes on secure websites.
   To troubleshoot other error messages, see Websites don't load - troubleshoot and fix error messages. 

Table of Contents

   Secure connection cannot be established
       Secure Connection Failed
       Did Not Connect: Potential Security Issue
   Website issues
       TLS version unsupported
       HSTS required
   Security software conflict
   Incorrect system clock
   Other secure connection issues

Secure connection cannot be established

When a website that requires a secure (HTTPS) connection tries to secure communication with your computer, Firefox cross-checks this attempt to make sure that the website certificate and the connection method are actually secure. If Firefox cannot establish a secure connection, it will display a Secure Connection Failed or Did Not Connect: Potential Security Issue error page. Secure Connection Failed

A Secure Connection Failed error page will include a description of the error and a Try Again button. There is no option to add a security exception to bypass this type of error.

Fx97SecureConnectionFailed ~~~ The url gives me this can you help please its not bitdefender total security blocking it I dont think https://support.mozilla.org/en-US/kb/secure-connection-failed-firefox-did-not-connect?as=u&utm_source=inproduct

Hi, I want to use dark background color theme in the Mozilla Firefox PDF viewer, read here https://support.mozilla.org/en-US/questions/1434510 but cannot find "userContent.css". My question is where can I find this file on a Windows 7 or Windows 10 installation?

When open firefox I have problem , with may sites that appear and I cannot use it. The same problem I have on work and house with mozilla firefox 64bit. I checked my pc with antivirus and for malwares but nothing I have. Please help

Firefox will not open this website (it is my personal photography website.) I'm using Windows 7 64 bit. Seemingly, every other website, but this one will open using Firefox. I have always been able, to use Microsoft's browser, to open this website, except, now, they no longer support W7/64. Thanks, for any help, David Johnson

When I am on espn.com/fantasy team pages everything loads correctly except for one popup table that does not. It will occasionally display but usually doesn't. When it fails to display, the scrollbar disappears but nothing shows. I tried clearing cache and cookies (Ctrl + F5, Settings + Clear data, etc.), refreshing firefox, and disabling all addons/extensions but the problem persists. I also tried turning off hardware acceleration and turned off proxies and secure DNS but nothing worked. I noticed this "_error.js" message in the debugger:

module.exports = __NEXT_REGISTER_PAGE("/_error", function () {

 var e = webpackJsonp(
   [566],
   {
     1789: function (e, r, o) {
       e.exports = o(288)
     },
   },
   [1789],
 )
 return { page: e.default }

})

I do not have this issue on firefox android, only on desktop. Thank you.

Yesterday I was on the Newsmax website. Today Firefox says its not a secure connection and it won't let me go to Newmax.com. I then tried to use the google browser and it went right to Newmax.com no problem. I am using Windows 7 like I have been for years. Please help. Thanks, Al