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Whenever i try to connect to any site, it fails to load and displays the following error message:

This web site requires a secure connection. - The page you are trying to view cannot be shown because this web site requires a secure connection. - The issue is most likely with the web site, and there is nothing you can do to resolve it. - You can notify the web site’s administrator about the problem.

When i press 'advanced' it says: [Site name] has a security policy called HTTP Strict Transport Security (HSTS), which means that Firefox can only connect to it securely. You can’t add an exception to visit this site.

This happens on every site i try to visit. I am on a samsung phone running android version 15. Other browsers do not have this problem (i am sending this from opera), and firefox works fine on my other devices.

Firefox browser has stopped opening websites on my Dell laptop. Get "secure connection failed" error message. Other browsers work just fine. I have refreshed, uninstalled and reinstalled Firefox from both firefox website (using Brave browser) and from MSN store.

i was using facebook until about 4 weeks ago. somehow it changed languages and while i was trying to put it back to english i was locked out.

this is part of the message i get

Firefox detected a potential security threat and did not continue to www.facebook.com because this website requires a secure connection.

www.facebook.com has a security policy called HTTP Strict Transport Security (HSTS), which means that Firefox can only connect to it securely. You can’t add an exception to visit this site.

The issue is most likely with the website, and there is nothing you can do to resolve it.

keep getting message [ sometjing dosen't look right ] and certificate revoked for my bank login it lets me go to the website but wont let me log into it. this is for blue federal credit union bank so i have to use a different browser for it, it works fine on other browser like edge .but not Firefox please help with this issue i like Firefox would hate to have to switch browsers but if this doesn't get resolved then ill have no choice too thank you

Starting with iOS 26.4, Firefox for iOS no longer connects to my internal HTTPS website. Safari connects with no problems.

I have a Microsoft Windows Server Active Directory network, and my internal web server is running on Windows Server 2019 Essentials, and uses a self-signed security certificate.

When I try to connect to the web server from my iPhone, all I get is a blank screen. Swiping down to refresh does nothing. I have no problems connecting to any other website with Firefox. As I mentioned earlier, Safari connects to my website with out issue.

Any suggestions?

Thanks.

I can't open my Wordpress website. I am using BlueHost portal. I get a message that says Something looks wrong and the following error code. SSL_ERROR_NO_CYPHER_OVERLAP

What do I do if Firefox wont let me log into my account on a website because the "certificate has been revoked"? I think it has to do with the "enhanced tracking protection" setting.

This is what the advanced message is:

Be careful. Something doesn’t look right.

Firefox spotted a potentially serious security issue with digital.bluefcu.com. Someone pretending to be the site could try to steal things like credit card info, passwords, or emails. Advanced What makes the site look dangerous?

Firefox is warning you about this site because the certificate provided for digital.bluefcu.com has been revoked and isn’t trusted anymore.

Ever since I updated Firefox, my website has stopped loading properly. It works fine in Chrome and Edge, but in Firefox, I get a security warning page instead.

The message says:

Your connection is not secure

The website tried to negotiate an inadequate level of security. https://reminniapk.com/

uses security settings that might be outdated or not supported by Firefox, so the browser blocks it.

Error code: NS_ERROR_NET_INADEQUATE_SECURITY

I haven’t made any major changes recently, so I’m not sure why this started happening. Is this something that needs to be fixed on the server side, or is there any setting in Firefox that could be causing this?

Any help would be appreciated.

418 For years, I've been using a website that's crucial to my professional work. It's a national archive website. Today, I suddenly got an error about a missing certificate for this website, and there's no way to bypass it. The cause isn't the archives, but the latest Firefox update. Please fix this immediately or refund me for the days I'm off work—or maybe I'll lose my job because of you.

I am filing my taxes through Intuit. Something I have done for years with NO problem. I realize my system is old and something about the security certificate somewhere is not correct and cannot be changed. I am NOT a technician and all this security stuff is way above me. Normally a box pops up saying Advanced settings and another box that allows me to Trust the site and I am logged in. Now I want Intuit to download my CRA information and it cannot because of this certificate thing and there is no bypass. So now you want me to contact the web owner, whoever that is, the Government of Canada??? Good luck. and have a technical discussion that requires at least three degrees from MIT, which I do not have, to solve the issue???? This is bloody nuts and now I cannot file my taxes. I am about to go totally insane. This is way beyond the average individual's skill set.

Does anyone know how I can get around this??

Hello, I'm French and I'm not very good at English I’ve been a Mozilla user for many years and am very satisfied with it. I’m having trouble interacting with the Ohm Energie website. I wanted to sign up for an electricity plan. The Ohm Energie page opened fine in my browser, but as soon as I tried to interact with it—for example, to request a quote—I received the following security notification: “Firefox has detected a potentially serious security issue with espace-client.ohm-energie.com. Someone impersonating the site might try to steal things like credit card information, passwords, or email addresses.” I was forced to use Chrome to sign up for my plan. I’m not the only Firefox user facing this issue. I called Ohm Energie and was told that many other customers have also encountered this problem. I’d like to be able to access my Ohm Energie account via Firefox—what can I do? I should mention that I’m not very experienced in resolving this type of issue. Thank you for your help

Ever since the update to iOS 26.4, I’m unable to access insecure or untrusted sites. I first noticed this when trying to get to some devices on my local network, but I tested an insecure site on the internet and it happened there too. What’s weird is that Safari does still let me access these sites after proceeding through the warning as expected (albeit with a refresh which is new, maybe a bug), but Firefox will just load for a split second and stop.

Just a quick rundown of some additional info:

- Firefox has been updated to the latest version, 149.0. - The local sites are ones I’ve previously given trust to - Firefox has local network access enabled in settings - This also occurs on iPadOS 26.4 - I did some more testing while writing this and it seems intermittent? For example, I have a server with several docker containers, and I can access some of them if I put the port in with the IP but others I can’t. I also have a device that I can get to via hostname but not IP. - I also downloaded Chrome to test things there and I get the “this connection isn’t private” message with the option to proceed anyway, and I’m able to access these sites there.

I’m not sure if this is something on Firefox’s end, Apple’s end, or a combination of the two. Either way, I wanted to see if there was anyone else experiencing this issue or if it’s just me.

i am not able to access openshift ui

Secure Connection Failed

An error occurred during a connection to oauth-openshift.apps.ocp4.example.com. PR_END_OF_FILE_ERROR

Error code: PR_END_OF_FILE_ERROR

   The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
   Please contact the website owners to inform them of this problem.

Learn more…

When I bring up the certificate-expired URL

<https://oaklandwiki.org/>

in Firefox 149.0 on Windows 11 I am told "You have added a security exception for this site." But not how to remove it. How do I do that? I did not see anything in Settings or about:config; did I miss it?

Secure Connection Failed

An error occurred during a connection to hub.localwp.com. The OCSP response is not yet valid (contains a date in the future).

Error code: SEC_ERROR_OCSP_FUTURE_RESPONSE

   The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
   Please contact the website owners to inform them of this problem.

Learn more…

Hi Love Firefox and use it every day to manage clients Google Ads accounts. Updated to latest version and now I'm getting this warning when I'm trying to access ads.google.com Doesn't appear that I can add an exception, is there a work around that I can use. Look forward to hearing back. Thanks in advance

Paul