thunderbird showing secure connection failed, start.thunderbird.net uses an invalid security certificate.....
thunderbird showing secure connection failed, start.thunderbird.net uses an invalid security certificate.....
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Please attempt to add an exception at the bottom of the error page. Then inspect the certificate - see the attached screenshot for instructions. Do not actually create an exception for the cert.
Who is the issuer of the cert? Please post a screenshot of the Certificate Viewer window with the issuer information visible.