Error: ASN1 string length does not match C string length. Embedded null character ?
According to Posteo they have no issues in their StartTLS implementation. Could you please check whether this is an issue on the starttls.info side or - if not - explain what this error means?
According to https://github.com/einaros/starttls.info/issues/18 the cause of this error may be umlauts in the certificate, but as far as I see the Posteo cert does not contain such a special character.
Have a look at the scan of Posteo: https://starttls.info/check/posteo.de
It reports:
According to Posteo they have no issues in their StartTLS implementation. Could you please check whether this is an issue on the starttls.info side or - if not - explain what this error means?
According to https://github.com/einaros/starttls.info/issues/18 the cause of this error may be umlauts in the certificate, but as far as I see the Posteo cert does not contain such a special character.
ping @einaros cc @posteo