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Certificate errors prevent me from accessing safe sites

I am unable to access my gmail account or my Linkedin account with FireFox. I get a certificate error SEC_ERROR_UNKNOWN_ISSUER yet this is a valid site and account. When… (Lesen Sie mehr)

I am unable to access my gmail account or my Linkedin account with FireFox. I get a certificate error SEC_ERROR_UNKNOWN_ISSUER yet this is a valid site and account. When Firefox gives the error it will not allow me to add a certificate exception, so I cannot use Firefox for these sites and probably others.

Gefragt von MadScientist8 vor 1 Jahr

Beantwortet von FredMcD vor 1 Jahr

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Your connection is not secure HTTP Strict Transport Security (HSTS)

After I updated to v65.0 (x64), all webpages (except Yahoo) gave me: "Your connection is not secure. This site uses HTTP Strict Transport Security (HSTS) to specify that… (Lesen Sie mehr)

After I updated to v65.0 (x64), all webpages (except Yahoo) gave me: "Your connection is not secure. This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox may only connect to it securely. As a result, it is not possible to add an exception for this certificate."

I read about changing the "security.enterprise_roots.enabled" value to "true" rather than the default "false" and this works, but I am afraid of future consequences.

I am using the following extensions in my Firefox installation: uBlock Origin, Disconnect

Operating system: Windows 7 Javascript enabled: Yes Cookies enabled: Yes Flash version: 32.0.0 Java version: Not installed Websockets supported: Yes Your full user agent string is: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:65.0) Gecko/20100101 Firefox/65.0

Gefragt von zebra14 vor 1 Jahr

Beantwortet von zebra14 vor 1 Jahr

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www.google.com uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown. The server might not be sending t

I'm getting errors above after Firefox update Jan 29, 2019, Google, Yahoo, IBM, and Amazon sites are unreachable for me now using Firefox but Chrome browser works fine. … (Lesen Sie mehr)

I'm getting errors above after Firefox update Jan 29, 2019, Google, Yahoo, IBM, and Amazon sites are unreachable for me now using Firefox but Chrome browser works fine.

Gefragt von Ronald Newton vor 1 Jahr

Beantwortet von FredMcD vor 1 Jahr

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Firefox updated today 65.0 and is now INTERMITTENTLY blocking all my sites

Message below is a Firefox message and is intermittent. Closing and opening Firefox will cure it for a while and then I am blocked again on next opening. Even your own … (Lesen Sie mehr)

Message below is a Firefox message and is intermittent. Closing and opening Firefox will cure it for a while and then I am blocked again on next opening. Even your own links are showing with no HTML only text! I am having to close and reopen several times before I can get back to Facebook or Messenger or even MY BANK.

"Your connection is not secure

"The owner of www.facebook.com has configured their web site improperly. To protect your information from being stolen, Firefox has not connected to this web site.

"This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox only connect to it securely. As a result, it is not possible to add an exception for this certificate.

"Learn more…

"Report errors like this to help Mozilla identify and block malicious sites

Gefragt von Sue L vor 1 Jahr

Beantwortet von philipp vor 1 Jahr

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Why is Firefox now blocking access to sites including accounts.firefox.com citing "invalid security certificate"

Since the last update Firefox is blocking access to sites like Facebook and Google citing "invalid security certificate". It asked me to log on but blocked that too as a… (Lesen Sie mehr)

Since the last update Firefox is blocking access to sites like Facebook and Google citing "invalid security certificate". It asked me to log on but blocked that too as accounts.firefox.com also has an invalid certificate apparently. What is going on?

Gefragt von Leatherdale vor 1 Jahr

Beantwortet von philipp vor 1 Jahr

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Version 65 does not open anymore my normally accessed website saying insecure connection

All the website i used to visit are now (version 65) blocked by Firefox. Exemple trying to reach my Google account : The owner of calendar.google.com has configured their… (Lesen Sie mehr)

All the website i used to visit are now (version 65) blocked by Firefox. Exemple trying to reach my Google account :

The owner of calendar.google.com has configured their web site improperly. To protect your information from being stolen, Firefox has not connected to this web site. This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox only connect to it securely. As a result, it is not possible to add an exception for this certificate.

I can access this account and all the rest with Chrome and with IExplorer

Please help. I want to continue with Firefox

Gefragt von REMJos vor 1 Jahr

Beantwortet von Kiki vor 1 Jahr

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Every site I try to visit its saying insecure connection why?

I am a researcher and there isn't a better browser on the planet to do what I do then Firefox. Today when I tried to go on antiwar.com it kept giving me an error saying t… (Lesen Sie mehr)

I am a researcher and there isn't a better browser on the planet to do what I do then Firefox. Today when I tried to go on antiwar.com it kept giving me an error saying the connection was insecure, the same thing with youtube or any other site I tried to visit. Firefox had just updated so I figured that is what the issue was, I deleted and reinstalled and it still did it. Finally, as I was writing this ticket it worked, but I didn't change any settings or anything it just started to work, I was wondering if you guys could tell me how I could avoid that annoying situation from happening again? If Firefox doesn't work I don't browse, I simply don't trust any other browser.

Gefragt von Joziah vor 1 Jahr

Beantwortet von philipp vor 1 Jahr

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Cannot acces any website usinf Firefox - MS Edge works fine

The following message occurs for all websites - "Your connection is not secure The owner of accounts.firefox.com has configured their website improperly. To protect your… (Lesen Sie mehr)

The following message occurs for all websites -

"Your connection is not secure

The owner of accounts.firefox.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.

This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox may only connect to it securely. As a result, it is not possible to add an exception for this certificate.

Learn more…

Report errors like this to help Mozilla identify and block malicious sites"


"accounts.firefox.com uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown. The server might not be sending the appropriate intermediate certificates. An additional root certificate may need to be imported. Error code: SEC_ERROR_UNKNOWN_ISSUER"

Gefragt von allemmon vor 1 Jahr

Beantwortet von philipp vor 1 Jahr

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last update does not accept https certificates, not even from google

locking this thread as duplicate, please continue at https://support.mozilla.org/en-US/que.../1248376 every site with https is rejected even google cannot work anymore … (Lesen Sie mehr)

locking this thread as duplicate, please continue at https://support.mozilla.org/en-US/que.../1248376

every site with https is rejected even google cannot work anymore

Gefragt von Hans_Metselaar vor 1 Jahr

Letzte Antwort von philipp vor 1 Jahr