IST683I

Explanation
 This message is the first in a subgroup of messages
that VTAM® issues when the connection
for channel-attached physical unit nodename failed.
A complete description of the message subgroup follows.  IST683I  CONNECTION REQUEST DENIED, ID = nodename
IST684I  I/O ERR, CSW = channel_status_word, SENSE = code

 channel_status_word (also
called subchannel_status_word) provides information
about the device and channel (or subchannel) status.
 code is
the sense code and provides information about the cause of the error.
See the appropriate hardware manual for the value of code.

System action
 Processing continues.

Operator response
 Save the system log for problem determination.

System programmer response
 Use the information in the two messages
to determine appropriate error recovery action. See the appropriate
hardware manual for the value of code.
 If
you cannot identify an I/O error or if SENSE = 0200 or 8200 in
message IST684I, check the following:  Ensure that the buffer size (IOBUF) is compatible between the
device and VTAM. This can be
determined by referencing the device installation guidelines.  Note: Some
devices require an even numbered buffer size. 

Ensure that the PU type defined to VTAM (XID=YES|NO)
matches the real PU type.
Ensure that you have specified an appropriate value for MAXBFRU
on the PU definition of nodename.
Ensure that the product of MAXBFRU and the buffer size (IOBUF)
is equal to or greater than the hardware's maximum send size. Reference
your hardware documentation for additional information about maximum
send size.

Routing code
 8

Descriptor code
 4 