Author Topic: Avast blocks Firefox? - Your connection is not secure  (Read 3085 times)

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Offline Gascogne

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Avast blocks Firefox? - Your connection is not secure
« on: April 21, 2016, 10:41:22 AM »
How come Avast blocks Firefox from connecting to the internet?



Firefox ver. 45.0.2

Avast Mac Security 2015
Avast ver. 11.9

Offline tumic

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Re: Avast blocks Firefox? - Your connection is not secure
« Reply #1 on: April 21, 2016, 12:36:47 PM »
Works fine for me. It's hard to say from the image what is going on on your computer, but I guess you are for some reason missing the Avast webshield certificate. A simple logout/login should fix this. If not, more investigation would be required to see what's wrong in your case.

Offline Gascogne

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Re: Avast blocks Firefox? - Your connection is not secure
« Reply #2 on: April 21, 2016, 02:15:42 PM »
Tried logout and login but it did not solve the problem on my Macbook.
FireFox and Avast works fine on my iMac.

Offline pkal30

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Re: Avast blocks Firefox? - Your connection is not secure
« Reply #3 on: January 16, 2018, 10:39:02 PM »
I have been have this same problem since sometime in early to mid 2017 I think.  I gave up on using Firefox completely and switched to Google Chrome.  I was wondering if you were ever able to find a solution.  I have been trying to use Firefox again today, but I still can't find a solution.  Thank you.

Offline ondrej.kolacek

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Re: Avast blocks Firefox? - Your connection is not secure
« Reply #4 on: January 17, 2018, 09:41:04 AM »
I have been have this same problem since sometime in early to mid 2017 I think.  I gave up on using Firefox completely and switched to Google Chrome.  I was wondering if you were ever able to find a solution.  I have been trying to use Firefox again today, but I still can't find a solution.  Thank you.
Hello,
we have currently an outstanding issue that when having Avast installed, after newly installing Firefox, it won't work correctly until next login. This will be fixed in the next version. Other than that it should be fine.
Kind Regards,
Ondrej Kolacek

Offline MadOranges

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Re: Avast blocks Firefox? - Your connection is not secure
« Reply #5 on: February 10, 2018, 11:16:09 PM »
This appears (google searches show it is) to be a regular Avast issue, across a number of application versions.  I am running avast security pro 13.4 , on OSX 10.12.6.  I had recently switched from mcafee (their mac software offers less, looks worse vs windows version) to avast, I did not think something so basic as browser compatibility would be an issue in 2018.  Log Off/ Restart/ Log On has not worked, neither has adding avast certificates in keychain/ login to firefox authorities manager.  Is there an approx date for a fix?

Offline ondrej.kolacek

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Re: Avast blocks Firefox? - Your connection is not secure
« Reply #6 on: February 12, 2018, 07:18:48 AM »
Hello,
in the version 58, Firefox has changed format in which it saves certificates, which is causing the issue. We are pushing out update as fast as possible. As a temporary workaround:

What you can do is to add "Avast trusted CA" to Firefox's certificate manager.

Firstly, you need to obtain a copy of the certificate.
This can be found with Keychain Access with Keychain "login" and category "Certificates". Search for "avast". You should find "Avast trusted CA". Select it and export it from the menu bar under "File" then "Export Items...". Save it somewhere accessible.

Next, the certificate needs to be added to Firefox's certificate manager.
Open Firefox's Preferences > Privacy & Security tab. Scroll down to Security > Certificates. Open "View Certificates...". Click on "Authorities" then "Import...". Import "Avast trusted CA" and trust it to "identify websites". You can select "identify mail users" if you want.

Kind regards,
Ondrej Kolacek