90% sure it is exprired because the sending is a java web app sending request to a message broker on the mainframe that handles routing, the requests have expiry set for 20 seconds
Scenario:
Sending from MQ 5.2 NT/4.0 to OS/390 MQ 5.2 over classic SVR/RQSTR TCP pairs. Channels in run status, sample amqsput/get from NT to os/390 back to NT successful.