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Status Future consideration
Workspace IBM i
Created by Guest
Created on Jul 22, 2025

SMB 3.1.1 support needed in IBM i 7.4

We have tested the communication between SMBv3 on IBMi and SMBv3.1.1 on Windows and it doesn't work.

Idea priority Urgent
  • Guest
    Sep 4, 2025
    The IBM development team understands the the rationale and content of the request. The requested function will be included in consideration during planning of future content.

    -- IBM i file systemd development team
  • Guest
    Jul 25, 2025

    The reason is security:

    We need to comply with the CIS Benchmark for Windows 11 (CIS Microsoft Windows 11 Enterprise Benchmark v4.0.0), as this is the security standard for the customer

    As outlined by this CIS version, it is required to enforce a minimum version mandate for SMB version 3.1.1.

  • Guest
    Jul 23, 2025
    The IBM development team requires more information to determine how to answer this request.

    What is the technical reason why SMB 3.1.1 support is required in IBM i 7.4?
    Is the client side configured to only allow 3.1.1 servers? (Not the default Windows behavior)
    Are you encountering connection problems because of Windows 11 24H2 stricter requirements on file names? (Problem 2 documented here: https://www.ibm.com/support/pages/node/7180720?myns=swgother&mynp=OCSWG60&mync=E&cm_sp=swgother-_-OCSWG60-_-E )

    -- IBM i NetServer development team
  • Guest
    Jul 23, 2025

    After laptops migration to Windows 11 with 24H2 service pack installed, it is not possible anymore to acess shared IFS directories from these laptops, even if SMBV3 is enabled on IBMi side and Netserver CP configured properly.