Even a small telecommunications network is a very complex system in which all components depend on one another. If one component fails and presents incorrect information to the other components, the latter may fail even more severely than the former. Sometimes the failure may be considerably delayed, and the error indicator may be lost before the error is detected. Thus, it is sometimes difficult to analyze a problem in the communication part of a system.
The Client daemon generates various messages associated with the use of the supported communication protocols and the associated products. Refer to CICS Transaction Gateway: Messages for a list of these messages and their explanations.
The communication products themselves generate error messages. For details of these, and information on troubleshooting, you should refer to the documentation for the communication product. The following sections summarize useful commands and utilities for problem determination.