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TCP Selective Acknowledgement (SACK) Status Can be Used to Filter Connection Lists

  • 1.  TCP Selective Acknowledgement (SACK) Status Can be Used to Filter Connection Lists

    Broadcom Employee
    Posted Jan 26, 2026 12:03 PM
    To our valued NetMaster customers:
    When viewing the advanced connection list (/CONNCF),  SACK status is now one of the Connection List Criteria for the List Connections (Advanced) option (/CONNCF). The new Selective Ack option enables you to filter your connections by SACK status, which can be:
    • DISABLED
    • ENABLED
    • INUSE
    Using SACK as a filter provides enables greater efficiency in troubleshooting connectivity issues. For more information about the SACK options, see the 3270 help. To enable this feature, apply PTF LU19236 and follow the instructions in the HOLDDATA.


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    Bryan Shuman
    Staff Technical Writer | Mainframe Division
    Broadcom
    750 Holiday Dr. | Pittsburgh, PA 15220
    bryan.shuman@broadcom.com | broadcom.com
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