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Can't+connect+with+the+just+downloaded+66.0.4 version to virtually any site -Firefox won't accept ANY certificate! No problems with other browsers.

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Can't connect with the just downloaded version 66.0.4 to virtually any site - not to Google, not to NYT, not even to Mozilla -Firefox won't accept ANY certificate! Following errors appear (examples): "Did Not Connect: Potential Security Issue Firefox detected a potential security threat and did not continue to addons.cdn.mozilla.net because this web site requires a secure connection. What can you do about it? addons.cdn.mozilla.net 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 web site, and there is nothing you can do to resolve it. If you are on a corporate network or using anti-virus software, you can reach out to the support teams for assistance. You can also notify the web site’s administrator about the problem.

Or: Warning: Potential Security Risk Ahead Firefox detected a potential security threat and did not continue to www.nytimes.com. If you visit this site, attackers could try to steal information like your passwords, emails, or credit card details. What can you do about it? The issue is most likely with the web site, and there is nothing you can do to resolve it. If you are on a corporate network or using anti-virus software, you can reach out to the support teams for assistance. You can also notify the web site’s administrator about the problem.

The explanation is as follows: Someone could be trying to impersonate the site and you should not continue. Web sites prove their identity via certificates. Firefox does not trust www.nytimes.com because its certificate issuer is unknown, the certificate is self-signed, or the server is not sending the correct intermediate certificates. Error code: SEC_ERROR_UNKNOWN_ISSUER

No problems whatever with other browsers. I'm sending this with Safari.

Can't connect with the just downloaded version 66.0.4 to virtually any site - not to Google, not to NYT, not even to Mozilla -Firefox won't accept ANY certificate! Following errors appear (examples): "Did Not Connect: Potential Security Issue Firefox detected a potential security threat and did not continue to addons.cdn.mozilla.net because this web site requires a secure connection. What can you do about it? addons.cdn.mozilla.net 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 web site, and there is nothing you can do to resolve it. If you are on a corporate network or using anti-virus software, you can reach out to the support teams for assistance. You can also notify the web site’s administrator about the problem. Or: Warning: Potential Security Risk Ahead Firefox detected a potential security threat and did not continue to www.nytimes.com. If you visit this site, attackers could try to steal information like your passwords, emails, or credit card details. What can you do about it? The issue is most likely with the web site, and there is nothing you can do to resolve it. If you are on a corporate network or using anti-virus software, you can reach out to the support teams for assistance. You can also notify the web site’s administrator about the problem. The explanation is as follows: Someone could be trying to impersonate the site and you should not continue. Web sites prove their identity via certificates. Firefox does not trust www.nytimes.com because its certificate issuer is unknown, the certificate is self-signed, or the server is not sending the correct intermediate certificates. Error code: SEC_ERROR_UNKNOWN_ISSUER No problems whatever with other browsers. I'm sending this with Safari.

Chosen solution

TyDraniu said

Because Firefox is a very secure browser.

Thanks!

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  • User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/11.1.2 Safari/605.1.15

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TyDraniu
  • Top 25 Contributor
301 solutions 1686 answers

Do you see the Advanced button on that page? Is there a certificate?

Do you see the '''Advanced''' button on that page? Is there a certificate?
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Question owner

TyDraniu said

Do you see the Advanced button on that page? Is there a certificate?

Yes, issued by Avast in 2018: expires in 2020.

''TyDraniu [[#answer-1219969|said]]'' <blockquote> Do you see the '''Advanced''' button on that page? Is there a certificate? </blockquote> Yes, issued by Avast in 2018: expires in 2020.
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TyDraniu
  • Top 25 Contributor
301 solutions 1686 answers

Helpful Reply

So Avast is intercepting your connection. See How to troubleshoot security error codes on secure websites

So Avast is intercepting your connection. See [[How to troubleshoot security error codes on secure websites#w_avastavg]]
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Question owner

TyDraniu said

So Avast is intercepting your connection. See How to troubleshoot security error codes on secure websites

This seems to have helped! Thank you very much!

Why was this happening only with Firefox and not with other browsers?

''TyDraniu [[#answer-1219972|said]]'' <blockquote> So Avast is intercepting your connection. See [[How to troubleshoot security error codes on secure websites#w_avastavg]] </blockquote> This seems to have helped! Thank you very much! Why was this happening only with Firefox and not with other browsers?
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TyDraniu
  • Top 25 Contributor
301 solutions 1686 answers

Helpful Reply

Because Firefox is a very secure browser.

Because Firefox is a very secure browser.
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Chosen Solution

TyDraniu said

Because Firefox is a very secure browser.

Thanks!

''TyDraniu [[#answer-1219986|said]]'' <blockquote> Because Firefox is a very secure browser. </blockquote> Thanks!
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