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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

I have had this CPU for 8 months. I have had issues from day 1 with the stock Fedora install of Firefox where text is missing and some green and/or pink boxes appear where the text boxes should be. This has happened with all versions up to 129.0.

This has only been happening with Firefox. Vscodium, (chrome based) Brave and every other Wayland application including foot and freecad render correctly. it is only firefox and only firefox with this GPU. If I run Firefox under qemu without eGL then the rendering is good. If I run it under qemu and enable the virtioGL driver I get the same issue.

I attach a sample of a screen shot that shows that was captured from the frame buffer. In the bottom left corner, you can see quite a few characters missing. This happens randomly and sometimes goes away when scrolling.

I have seen other issues that say that it is a hardware problem, but I am not convinced. This happened with mesa-24.2.0. Find the glewinfo attached below: (Glewinfo log is very long, uploaded to Pastebin for better viewing) https://pastebin.com/raw/1NMnAjmc

Sponsored Suggestion on the home page sucks. I don't find a way to remove it on 115.13.0esr (64-bit). I'm sad to see this practice getting implemented in my favorite browser.

I recently updated to 129.01 (64bit). Now Firefox keeps crashing, especially when I am trying to fill out an online form. Does anyone else have this issue? Any suggestions on how to resolve?

I ONLY want to use Firefox 55.0. My computer doesn't like your modern Microsoft type of Browser, Please supply ONLY FIREFOX 55.0.

Thank you , this is my 4th., Fourth request. Or do you prefer I use Opera Browser, it's up to you Firefox. Accommodate your user or lose business.

Charles

Hello, I noticed that some plugins that claim of MPL 1.1 License is actually close source, furthermore, some of those even have “Recommended” tag. Since this is a big misleading considering these plugins actually have very broad permissions, I consider those plugins as abuse. I reported them 1 or 2 months ago but no response. I don't want to list those names out in case it was just the author selected a wrong selection, but i do believe that the author should correct that, and the more important thing is Mozilla should check this more carefully.

I type something in Firefox, say "mice". A Google search string appears in the address bar, but it is greyed out, and nothing else happens. I have to go to that bar and hit Return to get to the search results. After this has happened once, everything appears to work as expected until I close the browser. On reopening, the problem has returned.

Whenever I try to sign into any website via my Google account, it takes me to a blank white popup that I cannot interact with (I can only close it). I've tried clearing my cookies, which almost works - it does the proper Google popup and lets me input my username and password, but I don't actually get signed in - and when I try to sign in again the popup is blank. This also happens in troubleshooter mode, so my extensions probably aren't what are causing this problem. Does anyone have any idea what's happening? Thanks in advance.

Firefox is not responding in one of my admin accounts. No problem with the other admin account.

This occured after installing Firefox 127.0.2. I restarted my iMac to complete the installation. Upon opening the admin account Firefox was not responding.

Thanks for your input in advance. My current email address is gellertr@socal.rr.com

Robert