I am facing the following error in communication channel monitoring for receiver FTP (IDOC to FILE scenario) in PI 7.3.
Message processing failed. Cause: com.sap.engine.interfaces.messaging.api.exception.MessagingException: An error occurred while connecting to the FTP server 'XX.XX.XXX.XXX:21'. The FTP server returned the following error message: 'com.sap.aii.adapter.file.ftp.FTPEx: 425 Unexpected reply codeFailed to establish connection.'. For details, contact your FTP server vendor.
For the same interface, 2nd issue is that we have some .tmp files got created on the FTP server in the specified directory.