Resolution: When using AS2 with authentication and encryption turned on and file preservation enabled, the outbound filename cannot be seen in the AS2 message which is generated. This is the expected behavior according to the AS2 standard. If the request is non-signed and non-encrypted, the HTTP header content-disposition field will contain the file name. If the request is signed or encrypted, the filename is in content-disposition of the MIME multipart which contains a request from the private process.