IBM Support

IT30601: Performance implications of IT28621 changes

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APAR status

  • Closed as program error.

Error description

  • IT28621 has affected the performance of TLS connections
    
    IT28621 shipped in 9.1.0.3 and 8.0.0.13; the issue will be
    fixed under the original APAR task for 9.0 as the APAR has not
    yet shipped in this release.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    IBM MQ using TLS client and channel connections with versions of
    IBM MQ that include APAR IT28621
    IT28621 shipped in 9.1.0.3, 9.1.0.4 and 8.0.0.13
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    Performance of TLS connections was found to be degraded by a
    GSKit environment setting set by IT28621 that is required to
    fully handle SSL key reset events without the connection
    dropping.
    

Problem conclusion

  • The required environment setting must now be enabled by setting
    the AMQ_SSL_USE_IO_EVENTS_HANDSHAKE environment variable.
    
    On some slower networks, customers may occasionally experience
    connection drop events coincident with SSL key reset events
    required when using GSM ciphers. If this becomes a problem, then
    the AMQ_SSL_USE_IO_EVENTS_HANDSHAKE environment variable may be
    set to resolve this.
    
    For Windows environments use:
    set AMQ_SSL_USE_IO_EVENTS_HANDSHAKE=1
    
    For Unix environments use:
    export AMQ_SSL_USE_IO_EVENTS_HANDSHAKE=1
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.16
    v9.0 LTS   9.0.0.11
    v9.1 LTS   9.1.0.6
    v9.2 LTS   9.2.0.2
    v9.x CD    9.2.1
    
    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

    IT30601

  • Reported component name

    IBM MQ BASE MP

  • Reported component ID

    5724H7251

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-10-15

  • Closed date

    2020-06-30

  • Last modified date

    2021-03-03

  • 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

    IBM MQ BASE MP

  • Fixed component ID

    5724H7251

Applicable component levels

[{"Line of Business":{"code":"LOB36","label":"IBM Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"8.0.0.0"}]

Document Information

Modified date:
05 March 2021