A fix is available
APAR status
Closed as program error.
Error description
The listener TCB performs additional processing for CHLAUTH in ccxCheckPeerBlocked.This processing is unnecessary in the customer's environment as they have CHLAUTH set to DISABLED.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 9 * * Release 2 Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: Inbound channels perform unnecessary * * processing which may lead to slower * * channel connections if a large number * * of clients attempt to connect * * simultaneously. * **************************************************************** When an inbound channel connects, additional processing is performed by the listener for the CHLAUTH function. This additional processing is performed regardless of whether the CHLAUTH function is DISABLED or ENABLED. The additional processing is unnecessary if CHLAUTH is DISABLED.
Problem conclusion
Where a customer has disabled CHLAUTH, the additional CHLAUTH processing performed by the listener task when an inbound channel starts is bypassed.
Temporary fix
Comments
APAR Information
APAR number
PH44691
Reported component name
IBM MQ Z/OS V9
Reported component ID
5655MQ900
Reported release
000
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2022-03-07
Closed date
2022-03-29
Last modified date
2022-05-03
APAR is sysrouted FROM one or more of the following:
PI59204
APAR is sysrouted TO one or more of the following:
UI79918
Modules/Macros
CSQXCCCX
Fix information
Fixed component name
IBM MQ Z/OS V9
Fixed component ID
5655MQ900
Applicable component levels
R200 PSY UI79918
UP22/04/13 P F204
Fix is available
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Document Information
Modified date:
04 May 2022