Hi, In case an AS4 gateway, with a PMode configured to use AS4 reception awareness and retries, attempts to send a message but, despite retries, does not succeed in doing so because of persistent HTTP connection failures, it could generate errors, including the following: - an EBMS0005 (ConnectionFailure) - an EBMS0301 (MissingReceipt) Which of the two do you think could, or should, be reported? Only a EBMS0005, only a EBMS0301, both or none? Are there any other error cases that you think could apply? Kind regards, Pim