Avast WEBforum

Consumer Products => Avast Free Antivirus / Premium Security (legacy Pro Antivirus, Internet Security, Premier) => Topic started by: REDACTED on May 28, 2018, 02:01:53 PM

Title: Avast blocking HTTPS traffic from Mozilla Firefox
Post by: REDACTED on May 28, 2018, 02:01:53 PM

Good day I'm having a problem with Avast Free, every time I try to access some website using Mozilla Firefox it returns me the following error message.
NOTE: The problem is only occurring in Mozilla Frefox, in Google Chrome and Microsoft Edge everything is working perfectly.
-------------------------------------------------- -------------------------------------------------- -------------

Your connection is not secure

The owner of www.google.com has configured this site incorrectly. To protect your information from being stolen, Firefox has not connected to it.

This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox can only successfully connect to it. As a result, you can not add an exception to this certificate.

To know more…

Report bugs like this to help Mozilla identify and block malicious sites

The www.google.com server uses an invalid security certificate.

The certificate is not trusted because the sender's certificate is unknown.
The server may not be sending the appropriate intermediate certificates.
You may need to import an additional root certificate.

Error code: SEC_ERROR_UNKNOWN_ISSUER

I would like to know how to proceed to fix this problem without having to DISABLE the Scanning of HTTPS traffic or only solve it even by disabling it ???
Here is an image to better describe the problem:
https://uploaddeimagens.com.br/imagens/imgerro-png

Title: Re: Avast blocking HTTPS traffic from Mozilla Firefox
Post by: Asyn on May 28, 2018, 02:23:10 PM

- Which Avast..? (Free/Pro/IS/Premier)
- Which version..?
- OS..? (32/64 Bit..? - which SP/Build..?)
- Other security related software installed..?
- Which AV(s) did you use before Avast..?

Title: Re: Avast blocking HTTPS traffic from Mozilla Firefox
Post by: REDACTED on May 28, 2018, 03:40:20 PM

Quote from: Asyn on May 28, 2018, 02:23:10 PM

- Which Avast..? (Free/Pro/IS/Premier)
- Which version..?
- OS..? (32/64 Bit..? - which SP/Build..?)
- Other security related software installed..?
- Which AV(s) did you use before Avast..?

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Avast Free Antivirus
Program Release: 18.4.2338 (Build 18.4.3895.0)
Operating System Windows 10 Home Single Language x64bits
Version: 1803
Compilation: 17134.81
I formatted the notebook and installed only Avast Free Antivirus as protection it is the only protection program installed on the machine.

Title: Re: Avast blocking HTTPS traffic from Mozilla Firefox
Post by: vojtech on May 28, 2018, 05:19:47 PM

Hello,
click 'Add Exception' and then 'View'. Is the certificate issued by 'Avast Web/Mail Shield Root'?
Do not confirm the exception.