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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

May I first say that trying to get hold of you to make this report was painful, and took about 20 minutes and a long walk around Mozilla's assorted website, opening two accounts, etc.

I received a notice while using Firefox on PC that an update was available. I was going to put it off, as I had 25 tabs open, but the notice indicated that my open tabs would be restored once the update was complete, so I approved the update. It download and I assume installed the update, seemed to temporarily close Firefox, and then reopened the original page with all my open tabs, plus an empty page. When I tried to open the tabs shown, they all indicated that the tab had crashed and then gave me the option of restoring that tab or on some restoring all tabs. Neither worked, in fact, that Firefox page became completely unresponsive and would not allow me to browse new urls (the tabs just spun). I actually had to use MS Edge to get to anywhere to seek out someplace to make a report. I first went to the discussion group and opened up an account there, but from there noticed that feedback on Firefox was at a different url. I then needed to create an account "here". Since nothing was working, I closed and reopened the Firefox page with all the tabs on it, figuring maybe it would restore the crashed tabs. It did not and all tabs were lost. I can probably get back to some of them using the history archive, but it was very disappointing and will be even more time consuming. I am running the current version of Win 10 pro, 64 bit, on a PC. I thought you would want to know about this. Thank you for your time.

Hello,

I have tried to find solutions to this and have not found anything to be a permanent fix. I recently have found my FireFox browser closing my first attempt to open and upon opening my second attempt Firefox will open but give me a pink address bar with a robot stating "browser is under remote control (reason: Dev Tools)" and the only thing that seems to get rid of this temporarily is going to my control panel (I'm a windows user) and toggling the remote assistance checkbox (I keep it unchecked since this problem has occurred). Then after re-opening Firefox again, it appears to work normally - no pink address bar with robot. Is there a permanent fix for this? Is it an OS issue or a Firefox issue? Maybe both? Any insight would be greatly appreciated. I am fairly tech savvy, but not too familiar with browser interfaces and solutions involving the command line.

Thank you,

When I open Firefox (with administrative privileges) lt won't stay open, it just looks like it going to load my previous season (at least that's what should happen), but after a few seconds it just stops and closes, all at once? Also, I should mention; Firefox is updated, Using Windows 10. I've tried to trouble shoot a little . . .

— Reinstalled Firefox. — I manually delete the files in Startup Cache by navigating to the cache folder in your Firefox profile. — Reinstalling Microsoft Visual C++ 2015 - 2022 Redistributable x86 and x64.

Now, at one point it did open, and I decided to refresh Firefox (removing extensions and restoring to default settings) by going to 'More troubleshooting information' option, then clicking the Refresh Firefox button. Closed it, restarted my laptop, and Firefox, added my usual extension / add-on. (I was thankfully able to save my bookmarks or back them up).

When I was done, I closed it. But when I try to open Firefox, lt won't stay open, it just looks like it going to load my previous season, but after a few seconds it just stops and closes?

Should I just remove Firefox all together from my laptop, and reinstall it??

I'm unable to watch videos on Crunchyroll. When I try to watch a video, the video becomes a static image of one frame. When I switch tabs and come back to the video, or hit refresh, it changes to the latest frame of the video but freezes once again. I have the latest version of Firefox and am using a Macbook. Per suggestions I have found online, I have tried disabling all my extensions, deleting my cache, deleting the Firefox folder in my ~/Library, making sure DRM content is enabled, and uninstalling and reinstalling Firefox altogether. Nothing works. Was hoping to switch over to Firefox since Google Chrome has banned ublock origin, but I keep running into these obnoxious video problems. The same issue also happens on Amazon Prime Video, but only when I press full screen.

I have been trying for a house but won't open, so I tried another Browser and the Email account opened first time. What have I done work or what can I do to fix. Firefox is my #1 Browser. Email removed for privacy

Why am I getting the message below every time I try to go on the The Great Courses website? The Great Courses Customer Service Dept it is Firefox that is blocking me from accessing their website. Please tell me how to correct the problem.

"You don't have permission to access "http://thegreatcourses.com" on this server.

Thank you.

Hi I have lost all my bookmarks. I bought a new device. On downloading Firefox the the bookmarks toolbar was Google's. Now Firefox on my other devices has the the Google bookmarks toolbar. Help please.

Hello, Today I was writing a draft post on Substack and the screen refreshed every few seconds. Possibly when Substack was saving changes. Each time it did this, the screen would go blank for an instant and refresh, and then I would have to click to place my cursor where it had been.

This is new as of this week. I was not writing on Substack using Firefox last week.

Firefox version 128.0, on Windows 10 Home v 22H2

thanks Chris.

When I open my youTube home in Firefox browser is completely blank nothind is showing I don't have this problem in other browser. I have tried in the settings to turn the history on and off but nothing has changed.

As part of my job I need to fill in long content into webpages. Many of the words can be long and not so common in everyday language - but are words that I use many times in the report writing I do. Like with MS Word's AutoCorrect... Could there not be an option for custom work shortcuts, such as:

cst automatically becomes: custom prg automatically becomes: Pseudomonas aeruginosa

Crazy or what

Hello, After update to firefox 127 for linux I get popup messages every time I visit a site. A typical message is e.g. for google.com:

www.google.com 1

Any hints? Thanks in advance.

Hi! When I bring up my Firefox browser it automatically shuts down and comes up again with two issues: 1. Do you want to restore pages? 2. A red striped URL with the little robot and the error message: browser is under remote control reason devtools

I've read all the postings and I don't understand many of what they are suggesting and those that I do, don't work. Please help p.s. I've already downloaded the newest version.

Google search no longer works on Firefox. Other browsers have no problems. Changing the default search engine on Firefox works (eg Bing), BUT. It can now find Google Maps, but Google Maps cannot find a location, because it uses a Google search. I tried the fix in about:config, but it had no effect.

In Chromium you can go a page backward or forward by swiping one finger to the left or right. This works really well. I have been missing this feature in Firefox for years now. Without it navigation in the browser is tedious on Linux tablets or phones.

Is something similar ever going to be implemented?