A fix is available
APAR status
Closed as program error.
Error description
CICS region tried to establish an Authorized cross-memory (AXM) connection to the Named Counter Server but failed repeatedly with error message: . AXMSC0034 Connection to server DFHNC.name failed because all AXM connections are in use. . The maximum number of AXM connections supported within an MVS image, currently 4096, has been reached. There is 1 server per LPAR. So it appears that the various CICS regions using the server has exceeded the 4096 limit. Note that each TCB issuing a named counter server request will perform its own connection to the server. If the requests to the NCS are made on open TCBs these connections could persist for some time within each CICS region. . Additional Symptom Search Keyword: KIXREVxxx
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All CICS users * **************************************************************** * PROBLEM DESCRIPTION: Message AXMSC0034 issued when trying * * to connect to AXM system services. * **************************************************************** The data servers for shared temporary storage, CFDTs and named counter services each use the AXM system services server connection component to manage connections to AXM, the authorised cross-memory server environment. AXM maintains a limit of 4096 for the size of the connection index vector. This is the maximum number of connections from AXM clients to servers per MVS image (LPAR). For shared temporary storage and CFDTs, CICS issues the connection from under the QR TCB, so this initial connection token can be shared by code running under QR or a subtask of QR (i.e. an OTE L8 or L9 TCB). This limits the number of shared TS and CFDT connections per CICS to one per instance of a particular shared data server. For named counter services however, the connection is made under the given TCB that is making its first API request to the NCS server. This is a requirement to allow batch NCS requests to be issued (outside of a CICS environment, where no common TCB is available to perform a shared connection). In the customer's case, many CICS systems were executing NCS commands from within programs executing under open TCBs. The large number of concurrent requests to the NCS servers meant that all 4096 connections became used, and when subsequent commands were issued they resulted in AXMSC0034 messages and the NCS commands failing. KEYWORDS: SCCSAIXN
Problem conclusion
SCCSAIXN in AXMSC has been changed to raise the connection index vector size to 16384. . The CICS Messages manual for CICS TS 5.4 and 5.5.will be updated as follows. Message AXMSC0034 will be changed to read: . AXMSC0034 Connection to server prefix.name failed because all AXM connections are in use. Explanation: The current region tried to establish an AXM connection to the AXM server prefix.name but the maximum number of AXM connections supported within an MVS image (currently 16384) has been reached. System action: The connection is rejected with return code 8, reason code 34. User response: If you anticipate a need for more than 16384 AXM server connections within a single MVS image, you will need assistance from IBM. See the Approaches to problem determination in Troubleshooting for guidance on how to proceed. Module: AXMSC Destination: Console
Temporary fix
Comments
APAR Information
APAR number
PH10458
Reported component name
CICS TS Z/OS V5
Reported component ID
5655Y0400
Reported release
100
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2019-04-01
Closed date
2020-02-19
Last modified date
2020-03-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI67984 UI67985
Modules/Macros
AXMSC
Fix information
Fixed component name
CICS TS Z/OS V5
Fixed component ID
5655Y0400
Applicable component levels
Fix is available
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Document Information
Modified date:
02 March 2020