Fixes are available
APAR status
Closed as program error.
Error description
Functionality added to WebSphere MQ to avoid IPV6 lookup, by setting an AMQ_NO_IPV6 environment variable. This capability was added due to a user situation where a connection delay of some 20 seconds was occasionally being encountered. This was tracked down to the two IPV6 lookups that MQ may perform for a connection, and the system was timing-out after 10s when attempting an IPV6 lookup. But the user only needed IPV4 lookup. Keyword: MQCONN
Local fix
Problem summary
**************************************************************** USERS AFFECTED: Users with system configuration issues for IPV6 lookups, when it is known that WebSphere MQ only needs to perform IPV4 lookups. Platforms affected: All Distributed (iSeries, all Unix and Windows) **************************************************************** PROBLEM SUMMARY: WebSphere MQ had no configurability to avoid performing IPV6 lookups. Whilst that should not normally be a problem, there may be user situations where it is desirable to inhibit these lookups.
Problem conclusion
Introduced the AMQ_NO_IPV6 environment variable, which when set so that MQ channel programs can see it, will prevent IPV6 lookups from being performed. This should only be set if there are definite system issues with performing IPV6 lookups, and it is known that the queue manager will not be called upon to process IPV6 addresses. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: v6.0 Platform Fix Pack 6.0.2.7 -------- -------------------- Windows U200312 AIX U821719 HP-UX (PA-RISC) U821511 HP-UX (Itanium) U822328 Solaris (SPARC) U821514 Solaris (x86-64) U822359 iSeries SI35511 Linux (x86) U822325 Linux (x86-64) U822358 Linux (zSeries) U822329 Linux (Power) U822327 Linux (s390x) U822357 v7.0 Platform Fix Pack 7.0.0.2 -------- -------------------- Windows U200302 AIX U822354 HP-UX (PA-RISC) U822349 HP-UX (Itanium) U822351 Solaris (SPARC) U822353 Solaris (x86-64) U822394 iSeries SI34790 Linux (x86) U822348 Linux (x86-64) U822393 Linux (zSeries) U822352 Linux (Power) U822350 The latest available maintenance can be obtained from 'WebSphere MQ Recommended Fixes' http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037 If the maintenance level is not yet available, information on its planned availability can be found in 'WebSphere MQ Planned Maintenance Release Dates' http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309 ---------------------------------------------------------------
Temporary fix
Comments
APAR Information
APAR number
IZ40621
Reported component name
WMQ LIN X86 V6
Reported component ID
5724H7204
Reported release
600
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2008-12-22
Closed date
2009-01-14
Last modified date
2011-01-25
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
WMQ LIN X86 V6
Fixed component ID
5724H7204
Applicable component levels
R600 PSY
UP
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Document Information
Modified date:
31 March 2023