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Has anyone had issues with Lets Encrypt SSL certificates with Avast Internet Security?

We are getting some reports that Avast Internet Security is blocking the connection. This is a screen shot from a clients computer (yes old windows, but still an issue regardless).

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We have also had reports on a totally different server, hosted by a totally different company as well. Same error, but this time on a mobile device using chrome.

Has anyone come across this yet?

nzmattman
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1 Answers1

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This might be related to one of the Lets Encrypt certificates expiring on September 30th, 2021.

Here's another question that talks about this: LetsEncrypt Certificate invalid/expired when seemingly not in PHPMailer, TLS, Openssl, file_get_contents, Sep 30 2021

David
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  • Most likely. And to solve it, you may remove the DST root from your Windows certificates and add ISRG Root X1 and R3 into your Windows certificates – LingYan Meng Oct 14 '21 at 02:15