I get a 'Secure connection' error failed with google stating "certificate contains the same serial number.

When I click on a link to a google search, I get the "Secure connection" error failed in Firefox. He says, "please contact the administrator of the server or email correspondent and give them the following information: your certificate contains the same serial number for another certificate issued by the certification authority."

I followed the instructions here:
https://support.Mozilla.org/en-us/KB/certificate%20contains%20The%20Same%20serial%20number%20As%20another%20certificate
and looked at this article:
https://support.Mozilla.org/en-us/questions/1028103?ESAB=a & As = AAQ

I uninstalled and reinstalled Firefox, deleted the entire folder profiles and reset Firefox. I see that the older (orphans) article points to my router. However, I have a new router and have updated their software. There is no button to add an exception (as stated in the article), so I can't just work around it. This problem does not occur with IE, so I have a hard time to believe that it is my router.

How to solve this problem? I really want to change browser.

Finally, I tracked the issue. The answer was found here:
https://support.Mozilla.org/en-us/questions/1028985

It turns out that Avast has a web shield that passes through its own verification of certificate https. Of course, this feature is not quite right and loses track of the certificates. Disable "https scanning" in the settings of Avast resolved the problem.

Tags: Firefox

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