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Sophos - Certificate authority: Invalid or not installed

Good afternoon,

When we accessed Sophos through the browser, we got an insecure certificate alert.

We imported a new certificate into Sophos (the same used on our website), but the following message appears in the certificates menu: Certificate Authority: Invalid or not installed.

Need help solving the problem.

Please include the email alertsivo@ivocutelarias.com in your replies.

Best regards,

Luis Fulgêncio



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  • Such a certificate is valid only for browsers that have the corresponding certificate imported, a thing you cannot expect from i.e.customers.

    Best solution would be to generate a certificate by Let's encrypt to the real DNS name.

    However you should access the firewall not by IP, but by DNS name.

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