Author Topic: Avast is blocking FF to open any page with https  (Read 1892 times)

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Offline svehlak

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Avast is blocking FF to open any page with https
« on: November 13, 2015, 05:46:58 PM »
There was a topic (https://forum.avast.com/index.php?topic=167577.msg1192147#msg1192147) about this, but the answer was not very helpful, so may be is better to elevate it again. I have MacMini (2015, El Capitan 10.11.1) with FF (42.0) and Avast (11.3, VPS 15111300). After fresh installation of FF it was not capable to open any page which uses https by default or is redirected to (google.com, mozilla add ons page) - always the warning page with bad certificate (sec_error_unknown_issuer) has been displayed and there was no possibility to add an exception. I tried to do it manually inside firefox, but it did not help. I also found out that Avast installed its own server certificate apparently to be able to listen the traffic and see the FF one. This certificate is self-signed. Now if the webshield is active, https pages with unknown cerrtificates to avast, which are pretty much all of them, will never open; once the webshield is deactivated, everything in FF is working normally and pages are opening. Safari is not affected despite I found the avast certificate in key chain. I have two questions:

1. Is this behavior feature or bug - please do not respond "you should not open unknown pages, because..", I do not believe, that google.com is scum or phishing..
2. How and why is avast certificate imported without my consent to FF?

Thanks
« Last Edit: November 13, 2015, 05:48:35 PM by svehlak »

Offline Eddy

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Re: Avast is blocking FF to open any page with https
« Reply #1 on: November 13, 2015, 06:06:55 PM »
1]
Please do as Tumic asked in the other thread.

2]
It was with your consent.
By installing avast you agreed to it.

Offline tumic

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Re: Avast is blocking FF to open any page with https
« Reply #2 on: November 16, 2015, 04:49:16 PM »
If the certificate is imported into Firefox, than it is a different issue than in the other thread.
There will be for sure some relevant messages in the system log file giving some info
why the connections are resigned with the untrusted certificate.

Offline krahulik

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Re: Avast is blocking FF to open any page with https
« Reply #3 on: November 27, 2015, 01:53:47 PM »
If your Firefox has updated, it might removed the certificate. Try to logout/reboot your computer