An intersystem communication failure can be caused by:
If the failure occurs between syncpoints, CICS and the remote system can back out any updates of recoverable resources either dynamically or following an emergency restart.
If a failure occurs during the syncpointing process while a distributed unit of work is in-doubt, CICS handles the unit of work according to the in-doubt attributes defined on the transaction resource definition. One possible course of action is to shunt the UOW as failed-indoubt to await resynchronization when communications are restored. When designing applications, remember that if a communications failure occurs and units of work are shunted as failed-indoubt, resources remain locked until after resynchronization.
For information about the resolution of in-doubt units of work, see the CICS Intercommunication Guide.
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