On the mainframe, there are two frequent causes of operational errors:
The CICS or SNA operator varied the resource out of service.
SNA placed the line, physical unit (PU), or LU into a non-operating (INOP) state because of a network outage.
In these cases, either:
The DirectConnect Administrator receives SNA software time-out and connection failure messages in trying to start up DirectConnect,
or
The requesting client receives an SNA software message indicating that the system could not start the RPC.
When you are contacted about such messages, reactivate the necessary mainframe resources.
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