AS2 Decryption Error;Failed to Verify MDN Signature

AS2 Decryption Error;Failed to Verify MDN Signature


When we send AS2 encrypted S/MIME data to a trading partner, we receive a 'bad' MDN back indicating a decryption error occurred.

MDN Error Messages:

The encrypted message sent to 112084681 has been received.
However, the message could not be decrypted/verified (may have been altered).
There is no guarantee about the validity of the actual transaction, or that it has been
read by a human operator.

Content-Type: message/disposition-notification
Content-Transfer-Encoding: 7bit

Reporting-UA: BOECSAPP03 (Liaison ECS 7.1)
Original-Recipient: rfc822
Final-Recipient: rfc822;
Original-Message-ID: <287f1220bf03414a9840b30a63f81092@287f1221bf03414a9840b30a63f81092>
Disposition: automatic-action/MDN-sent-automatically; processed/Error: decryption-failed

EXTOL Secure Error Log:

Received HTTP response(200 OK)
Closed connection
Delivered document
Received synchronous MDN
Failed to verify MDN signature( Verification failed)


We needed to contact AS2 trading partner to obtain their new AS2 public certificate. With the new certificate, TP was able to decrypt our outbound data.

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