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I am trying to delete the cert8.db to fix an Untrusted Connection (Error code: sec_error_unknown_issuer) but I don't have a cert8.db, just a cert8.

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DWilliams
DWilliams
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For the last few days, Firefox will not let me access certain websites, e.g., Yahoo, Twitter and Google, that I have accessed hundreds of times before. (They are accessible via Internet Explorer.) There is no option to bypass the warning page. I have read some other posts, checked the clock time, which seems OK (although it is UTC rather than GMT - I am in the UK) and gone into the Profile folder to delete 'cert8.db' but I don't have that, just a 'cert8' - no db. Is this the problem?

I am running Kaspersky. Have today activated my new subscription to see if that would make any difference; it hasn't. I have also refreshed Firefox and run a Glary disk cleaner.

I use Google via Firefox for my business as I am continually checking websites and information, and IE is not a good browser, so I would really like to solve this problem. I am not very techie though and don't want to do anything too drastic!

Any help will be greatly appreciated.

The message is:

This Connection is Untrusted

You have asked Firefox to connect securely to twitter.com, but we can't confirm that your connection is secure.

Normally, when you try to connect securely, sites will present trusted identification to prove that you are going to the right place. However, this site's identity can't be verified. What Should I Do?

If you usually connect to this site without problems, this error could mean that someone is trying to impersonate the site, and you shouldn't continue.

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.

twitter.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)

For the last few days, Firefox will not let me access certain websites, e.g., Yahoo, Twitter and Google, that I have accessed hundreds of times before. (They are accessible via Internet Explorer.) There is no option to bypass the warning page. I have read some other posts, checked the clock time, which seems OK (although it is UTC rather than GMT - I am in the UK) and gone into the Profile folder to delete 'cert8.db' but I don't have that, just a 'cert8' - no db. Is this the problem? I am running Kaspersky. Have today activated my new subscription to see if that would make any difference; it hasn't. I have also refreshed Firefox and run a Glary disk cleaner. I use Google via Firefox for my business as I am continually checking websites and information, and IE is not a good browser, so I would really like to solve this problem. I am not very techie though and don't want to do anything too drastic! Any help will be greatly appreciated. The message is: This Connection is Untrusted You have asked Firefox to connect securely to twitter.com, but we can't confirm that your connection is secure. Normally, when you try to connect securely, sites will present trusted identification to prove that you are going to the right place. However, this site's identity can't be verified. What Should I Do? If you usually connect to this site without problems, this error could mean that someone is trying to impersonate the site, and you shouldn't continue. 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. twitter.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)

Alla svar (6)

philipp
philipp
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hi DWilliams, most likely you'll need to tweak some settings in kaspersky in order to fix this issue: go to kaspersky's settings > additional > network. there you could either disable the "scanning of encrypted connections" or look under advanced if there is an option to reinstall their certs there...

DWilliams
DWilliams Frågans ägare
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Dear Philipp

Thank you. I followed the instructions and installed the Kaspersky Lab certificate but that didn't resolve the problem. I then looked in Settings > Additional > Network, as you advised, and changed the setting from "Scan encrypted connections upon request from protection components" (which was automatically selected) to "Do not scan encrypted connections". Kaspersky responded with the following message: "This will reduce protection on your computer. Parental Control [which I don't use] and Kaspersky URL Advisor [what does that do?] will not be able to control encrypted connections and Safe Money [which I do use, although it sometimes doesn't work - another Kaspersky issue] will be disabled. Are you sure you want to continue?" Well, I did continue and then checked Firefox, and the websites were accessible, but I've gone back into Kaspersky and returned it to the original setting because I don't know what this encrypted connections scanning setting is NOT doing when it's turned off. Can you advise about that?

philipp
philipp
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i'd consider it a non-essential part of your security product & just keep it off, as this feature can even make you less secure in some instances: http://www.scmagazineuk.com/updated-kaspersky-leaves-users-open-to-freak-attack/article/411470/

DWilliams
DWilliams Frågans ägare
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Dear Philipp

Thanks for your reply. I read that article but thought that, as it was from a few months ago, Kaspersky should have addressed the issue, so I rang them to say that I had a problem with Firefox. Guess what? They knew all about the problem and asked me to uninstall the version I had downloaded the previous day and install a new version (16.0.1.445) to which they sent me the link. It seems to have solved the issue - but perhaps Kaspersky should have contacted its customers to tell them that there was a problem with the software and provide the update without us having to spend hours (in my case) on trying to resolve it, and 'blaming' Firefox at first. Anyway, if other people running Kaspersky have the same issue with Firefox, hopefully they will find this post and see how to fix it. Thanks again for your help.

DWilliams
DWilliams Frågans ägare
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  • Just to clarify, it was me who was 'blaming' Firefox at first - Kaspersky staff weren't!!*
et tu Brute
et tu Brute
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I have uninstalled & re-installed both Firefox & Kaspersky Internet Securty (from 2015 to 2016 version)... same freaking issues. Why has this become 'rocket science'?... I have been scouring your forums for hours & finding nothing but incomplete answers!!! It takes me back to the crappy days of Microsoft Internet Explorer!!! COMPLETELY UNPRODUCTIVE IS WHAT I CALL IT!