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Old 22nd Feb 2015, 12:19   #1
koli
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Security certificate issues in Firefox

Hi guys, I am hoping you can help me with something.

Couple of weeks ago I started having problems with certificates in Firefox under W8.1. Initially it was just with internet banking websites but now it is also social media and online shopping. This is what I get when I try to log in to youtube:


I don't have this problem on Chrome on the same pc EDIT: Kaspersky is now also giving me the message bellow on Chrome with Amazon website. Firefox running under Mint Linux that I run on Vmware on my pc is also ok.

This morning is got this error from my Kaspersky AV:


This is the said certifcate:


Does anybody know what the problem is and how to fix it?
Thanks

Last edited by koli; 22nd Feb 2015 at 13:25. Reason: see in red
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Old 22nd Feb 2015, 15:16   #2
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You could try resetting your profile. Help menu, troubleshooting, reset firefox. It will move your old profile to the desktop so you won't loose your bookmarks but you will have to import them to your new profile. Or if you use sync it will do that for you and reinstall your extensions too.
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Old 22nd Feb 2015, 16:47   #3
koli
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Thanks Ivan,

I reset the FF as advised and it didn't make any difference. I completely uninstalled it, same result.
Then I switched off my Kaspersky AV and now everything works as normal, i.e. no FF warnings about certificates.

In the past I had some warnings from AV that my network is not secure but I can't do anything about it (i rent my landlord looks after wifi). I guess I need to find out if my AV is overly cautious or I actually should be worried about the network security.
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Old 22nd Feb 2015, 17:33   #4
aramil
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Install the Kaspersky Certificate manually.

Here is how to do:

1.Open the main browser window.

2.Open the Options window depending on the browser options:
(Guessing you are using one of the latest versions of Firefox)

click ALT button to open menu barIn the menu select Tools > Options.

3.Click the Advanced icon
4.Go to the Certificates tab
5.Click the View Certificates button

6.In the Certificate Manager window go to the Authorities tab
7.Click the Import button

8.Browse the path to the certificate file. The default folder is:
C:\ProgramData\Kaspersky Lab\AVP15.0.1\Data\Cert\ (have to show hidden files/folders set in explorer)

9.Select and Click Open:
(fake)Kaspersky Anti-Virus Personal Root Certificate.cer


10.In the Downloading Certificate window select the purposes which you trust the certificate should perform (web)

11.Click OK to close each window


12.In the Certificate Manager window make sure Kaspersky Lab’s certificate is installed and click OK
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Last edited by aramil; 22nd Feb 2015 at 17:39.
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Old 22nd Feb 2015, 18:47   #5
koli
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Thanks Aramil,

that helped. I haven't realised that I set AV to scan secure connections as well. I am not sure it is a good idea either as I presume it can see data (including passwords?) being transmitted between me and banks. I will need to do some research on this and have a think if I am comfortable with it.
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Old 22nd Feb 2015, 18:47   #6
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is the computers date correct?
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