055

Explanation
The system found an error while processing a listen
or signal request for event notification.  Register 15 contains a
hexadecimal reason code that explains the error: Code
Explanation
24
The storage containing the requestor's event parameter list was
overlaid after initial validation.
28
An error occurred in one of the listen requests waiting to be
processed.
30
An ENF signal pre-processing routine returned a non-valid return
code.
34
During ENF initialization, ENF could not obtain the address of
a needed signal pre-processing routine.
38
The control blocks representing a listen request contain instructions
that are not valid for comparing the listener's bit-mapped qualifier
with the bit-mapped qualifier associated with the current event.
3C
The system could not create the IEFSCHAS address space. Time-of-error
registers 2 and 3 contain the return and reason codes, respectively,
from the ASCRE macro.
40
The system could not join or create ENF's XCF group. Time-of-error
registers 2 and 3 contain the return and reason codes, respectively,
from the IXCJOIN macro.
44
The system could not obtain information about the other members
of ENF's XCF group. Time-of-error registers 2 and 3 contain the return
and reason codes, respectively, from the IXCQUERY macro.
48
The system could not send an event notification to other systems
in the sysplex. Time-of-error registers 2 and 3 contain the return
and reason codes, respectively, from the IXCMSGO macro.
4C
The system could not receive an event notification from some other
system in the sysplex. Time-of-error registers 2 and 3 contain the
return and reason codes, respectively, from the IXCMSGI macro.

System action
For reason code X'34', ENF initialization
fails. For reason codes X'3C', X'40', and X'44',
ENF sysplex-wide notification is not available. For all other reason
codes, the system abnormally ends the current task.  All other processing
continues.

System programmer response
If the problem persists, search problem
reporting data bases for a fix for the problem.  If no fix exists,
contact the IBM® Support Center.

Programmer response
Respecify the data on the event parameter
list.

Source
Event notification facility (ENF)