If an error occurs that makes the Handler unable to execute a certain program (such as, the program does not exist or is disabled) the Handler sends a message back to the TMA TCP gateway. If any other type of error occurs within an application program and the Handler is not notified of the problem, a time-out message is sent from the Handler back to the remote gateway.

For requests originating with CICS, Oracle Tuxedo returns information about specific problems, if possible. If there are network problems that prohibit the transmission of data, the request receives a timeout error.