APPC Subsystem on MPE/XL Node Manager's Guide (30294-90007)

132 Chapter6
Troubleshooting the APPC Subsystem
Troubleshooting Tools
APPC Subsystem Messages and Return Codes
Appendix A , “Messages,” contains a complete list of all APPC
subsystem messages and return codes. It describes the cause of each
message and any actions you should take to resolve a problem. The
APPC subsystem generates the following kinds of messages:
• Subsystem startup messages are returned to the terminal from
which the APPCCONTROL START command is issued. They tell you
how subsystem startup is progressing. They are informational only
and require no action.
• Error messages may be returned when you issue an APPCCONTROL
command or when you use the NMDUMP utility to format the user
trace or internal trace. They are returned to the terminal from which
the APPCCONTROL command was issued. Error messages indicate
that an APPCCONTROL command could not be executed or that a
trace file could not be formatted.
• Warning messages may be returned when you issue an
APPCCONTROL command. Some of them indicate problems that you
should resolve, and some of them are informational only and require
no action.
• Return codes are returned in the
ReturnCode parameter of
control operator intrinsics. A return code is the number of a message
in the message catalog that indicates whether an intrinsic call was
successful and the result of the intrinsic call.
• APPC subsystem configuration validation messages are
generated through NMMGR when you validate your configuration
file.
The APPCCONTROL STATUS Command
The APPCCONTROL STATUS command provides a summary of APPC
subsystem status. Chapter 2 , “Interactive Control Operator
Commands,” in this manual describes the APPCCONTROL STATUS
command and tells you how to read the display.
The APPCCONTROL STATUS command allows you to specify a session
type for which you want status information. You can specify a
configured session type, or you can specify STYPE=SNASVCMG to get the
status of the sessions used by the CNOSTP
(Change-Number-of-Sessions TP) and the COPRTP (Control Operator
TP). These two transaction programs, which are part of the APPC
subsystem, control the number of active sessions and process your
requests to change the number of active sessions. The CNOSTP and
COPRTP are active only for independent LU session types with parallel
sessions.