ASN1_verify:unknown message digest algorithm

This article applies to:

• Trustwave MailMarshal (SEG) 6.X
• Trustwave ECM/MailMarshal Exchange/Trustwave ECM 7.X
• Automatic updates/SpamCensor updates

Symptoms:

• Error message reported by automatic update: 0D890A1: asn1 encoding routines:ASN1_verify:unknown message digest algorithm

Causes:

• The update server is secured with a SHA-256 signed certificate as required by current best security practices. The affected product versions use an older SSL package that does not recognize this certificate.
• Note that all affected versions of MailMarshal SMTP are unsupported and no automatic updates are available for these versions in any case.

Resolution:

• For Trustwave MailMarshal (SEG), to resolve this issue, upgrade to a current supported version of SEG.
• For Trustwave ECM/MailMarshal Exchange, to resolve this issue, upgrade to version 7.2.0 or above.