HL7 Unconsumed zombie ack messages suspended on MLLP R&R receive port from MLLP R&R send port.

Question

      I have a content message routing scenario with request/response mllp receive and send port . Below are the points which describes the situation :-
      1) mllp message received from upstream application on receive port which sends back the direct synchronous ack .
      2) Message is routed to send port which sends the message to the downstream app and receive the ack from the downstream app.
      3) The ack received from downstream app is handled using a file type send port which dumps these acks to a folder.
      Now the issue which is occurring intermittently, is that the ack message received from the downstream application get suspended on the receive port with the below error -
      "The instance completed without consuming all of its messages. The instance and its unconsumed messages have been suspended." Error code - 0xC0C01B4C.
      This issue doesn't occur for all the messages. It seems the ack messages received by the send port, is searching the receive port instance which submitted the message to message box. But interestingly, not all the ack messages
are suspended.
      If anybody have any idea about this behavior , kindly respond..

Answer 1

I also need this question answering!
Comment from my host:
To prevent SPAM activity we have blocked the ability to send messages from our system where the FROM address is spoofed to anything other than the original sender's ID. The work around in your situation is to change the REPLY-TO address or switch to SMTP authentication.