Forum Firefox zajednice

I have started receiving a secure connection failed error message for a portal log-in website that worked fine for the past 6-7 months (see attached document). Other people in my group use Firefox and Bitdefender to access the portal and none of them are having this issue.

I originally believed the problem to be my anti-virus (Bitdefender) and worked with them to resolve the problems. After trying various solutions including clearing my cache, using private mode and turning off different components of their software, Bitdefender believes the problem is with my browser setting and not their software. I also tried accessing the portal using Chrome in both regular and incognito modes and cannot access the site which would seem to rule out the problem being a Firefox browser problem but contacting Firefox support seems to be the next logical step.

I have been to the Firefox FAQ and saw similar problems with potential solutions - DNS over HTTPS, TLSKEYLOGGING issues, add-on exceptions - none of which worked. I have the most recent version of Firefox and am running Windows 11 home version.

Sometimes if I hit refresh after receiving the error message, the browser will try to connect and I will get a server time out message. If I keep hitting "try again", sometimes the portal log-in screen will appear and allow me to log-in. The key word is "sometimes" since often I just keep getting the server time out message.

Any ideas for me to try from this forum?

Since your last update, I can't access amazon anymore without a security warning. I know that my connection is private and secure. The only thing that's actually happening, is that my Browser is interfering with me without cause. Can you please make that stop ?

There is seriously something wrong with the way Firefox operates. There is nothing wrong with the following site so why am I seeing this message?

Be careful. Something doesn’t look right.

Firefox spotted a potentially serious security issue with news.sky.com. Someone pretending to be the site could try to steal things like credit card info, passwords, or emails.

news.sky.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. Advanced What makes the site look dangerous?

The site is set up to allow only secure connections, but there’s a problem with the site’s certificate. It’s possible that a bad actor is trying to impersonate the site. Sites use certificates issued by a certificate authority to prove they’re really who they say they are. Firefox doesn’t trust this site because its certificate isn’t valid for news.sky.com. The certificate is only valid for: . What can you do about it?

news.sky.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.

Firefox is saying that there is a problem with my Xfinity internet & advises me not to log in. This happens only on my mac. Firefox seems to work fine on my i pad & i phone. Safari does not show this warning & they are very strict about internet issues. how do I fix this problem?

Over and over again when I try to open a website I get the notice that says "Secure Connection Failed". I have to restart my laptop and then I can open the website that I tried to access before. I've tried using the suggestions in the forum with no result in solving this problem. I've attached the page that comes up showing the problem.

I am currently unable to access certain websites, particularly banking sites. The following error appears: Secure Connection Failed

An error occurred during the connection to modern.ttbank.ir. The peer's certificate has been revoked.

Error code: SEC_ERROR_REVOKED_CERTIFICATE

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

This is happening even though I was able to access this site without any problems until yesterday.

My email is jamek2006@yahoo.co.uk but when I try to Log In I am told the site is insecure and the place for password is blocked.

Kindly assist.

I was going to look at a friend's website that has an SSL-certificate, has had it for years, which has been working all that time. Now Firefox informs me: "Firefox doesn’t trust this site because its certificate isn’t valid for www.wuwei-school.nl. The certificate is only valid for: wuwei-school.nl."

Really? I pretty sure there's nothing wrong with the certificate and I was taught that the "www" component is not important as a prefix for the domain name in a URL. It is just a shorthand code to show that the address is a URL. Can Mozilla fix this issue? Or, at least, explain?

Thanks

Firefox's full message: - - - Be careful. Something doesn’t look right.

Firefox spotted a potentially serious security issue with www.wuwei-school.nl. 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?

The site is set up to allow only secure connections, but there’s a problem with the site’s certificate. It’s possible that a bad actor is trying to impersonate the site. Sites use certificates issued by a certificate authority to prove they’re really who they say they are. Firefox doesn’t trust this site because its certificate isn’t valid for www.wuwei-school.nl. The certificate is only valid for: wuwei-school.nl. What can you do about it?

Probably nothing, since it’s likely there’s a problem with the site itself. Sites use certificates issued by a certificate authority to prove they’re really who they say they are. But if you’re on a corporate network, your support team may have more info. If you’re using antivirus software, try searching for potential conflicts or known issues.

View the site’s certificate

Learn more about secure connection failures

Error Code: SSL_ERROR_BAD_CERT_DOMAIN

Aug 21, 2026 11:10:31 PM GMT+2 - - -

Здравствуйте. Я живу в России и у многих Российских сайтов отозвали сертификаты безопасности, но нам гражданам этой страны приходится пользоваться данными сайтами на свой страх и риск. В последних версиях Firefox не даёт войти на данные сайты даже на свой страх и риск. Прошу Вас от лица всех людей проживающих на территории России вернуть кнопку "принять риск и войти на сайт".

Заранее спасибо.

Be careful. Something doesn’t look right.

Firefox spotted a potentially serious security issue with ebanking.bankmellat.ir. Someone pretending to be the site could try to steal things like credit card info, passwords, or emails.

ebanking.bankmellat.ir 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.

https://accounts.firefox.com/?context=oauth_webchannel_v1&entrypoint=fxa_avatar_menu&action=email&service=sync&client_id=5882386c6d801776&response_type=code&access_type=offline&scope=https%3A%2F%2Fidentity.mozilla.com%2Fapps%2Foldsync+profile&state=lxOkn6sd6-N3G1OsYU2hEQ&code_challenge=weuFT-Sxy3dZMJ8o0LzdHVJ8lKgMcpzxQeTNUoXQy_s&code_challenge_method=S256&keys_jwk=eyJjcnYiOiJQLTI1NiIsImV4dCI6dHJ1ZSwia2V5X29wcyI6W10sImt0eSI6IkVDIiwieCI6ImI1NUdROTg3UlNzY2hWMTVmQ05qd3hTMkN6TE5VSWpBWHZOVzRBMmJLcjAiLCJ5IjoidC14ZDI0c2lPZF9tV3JWWXZTRWRBVFRaWC0zMi1yMWtDY3QycmgxQ3NGVSJ9

Your connection is being intercepted by a TLS proxy. Uninstall it if possible or configure your device to trust its root certificate.

HTTP Strict Transport Security: true HTTP Public Key Pinning: true

Certificate chain:

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My virus program is sedning me this message.

firefox.exe attempted to establish a connection relying on an unmatching security certificate to email.squarespace.info. We blocked the connection to keep your data safe since the used certificate was issued for a different web address than the targeted one.

How do I stop firefox from contunally reaching out to this web site.

https://ebanking.bankmellat.ir/

Peer’s Certificate has been revoked.

HTTP Strict Transport Security: true HTTP Public Key Pinning: false

Certificate chain:

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I periodically need to access a website with an expired or self-signed certificate. I understand the risks, but the browser won't let me. I've searched both the regular settings and about:config, but I can't find an option to restore the button to ignore the warning. How can I ignore the SEC_ERROR_BAD_SIGNATURE notification and proceed to the website I need?

Secure Connection Failed

An error occurred during a connection to www.facebook.com. SSL received a record that exceeded the maximum permissible length.