If you do internet searches on IXC402d there are several entries that might
explain the IXC402D

>From the MVS Init and Tuning Guide for COUPLxx member you can find

OPNOTIFY(seconds)
    Specifies the amount of elapsed time (in seconds) at which XCF on
another system is to notify the operator (by using message IXC402D) that
this system has not updated its status. The OPNOTIFY value can either be
specified as an absolute value (in the form of nnnnn) or as a relative value
(in the form of +nnnnn).

        When an absolute value is specified, the OPNOTIFY value must be
greater than or equal to the INTERVAL value if INTERVAL is specified. The
effective OPNOTIFY value used by the system is the greater one of the
indicated OPNOTIFY value and the effective failure detection interval.
        When a relative value is specified, the effective OPNOTIFY value
used by the system is the sum of the effective failure detection interval
plus the relative OPNOTIFY value.

    Value Range:

        For absolute value: 3 to 86400 (seconds)
        For relative value: 0 to 86400 (seconds)

    Default: A relative value of +3 is used. Thus the effective OPNOTIFY
value used by the system equals three plus the effective failure detection
interval.

Is this for a z/OS Guest under z/VM or a z/OS system?

Lizette

> 
> Yes,I have check IXC420D.
> In these two zos,SA will automatically reply IXC420D with down.but what
make
> IXC420D happen?
> 
> 
> 

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