IBM Support

IT29784: FTPS FAILS WHEN SERVER SENDS MULTI-PACKET WELCOME MESSAGE

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APAR status

  • Closed as program error.

Error description

  • When using explicit FTP over TLS in the File Nodes, if the
    remote server sends a welcome message that spans multiple
    TCP/IP packets then the product interprets the second such
    packet as containing the response code for the AUTH TLS request.
    
    
    If this packet does not have a status code of 234 then the
    product will interpret this as a failure to switch to TLS and
    will immediately close the comand socket resulting in an
    exception like the following:
    
    
    BIP3384E: File node ''File Read1'' in message flow
    ''Nec_Customer''. An unexpected
    
    reply has been received from ''FTPS'' server ''hostName'. The
    command and reply are: ''Negative response received on AUTH:
    220''.
    
    
    Additional Symptom(s) Search Keyword(s):FTP over TLS, File
    Nodes,  AUTH TLS, BIP3384E,
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    All users of IBM Integration Bus version 10 or App Connect
    version 11 using FTPS with the File Nodes.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    <span style="background-color:rgb(255, 255, 255)">When using
    explicit FTP over TLS in the File Nodes, if the </span><span
    style="background-color:rgb(255, 255, 255)">remote server sends
    a welcome message that spans multiple </span><span
    style="background-color:rgb(255, 255, 255)">TCP/IP packets then
    the product interprets the second such </span><span
    style="background-color:rgb(255, 255, 255)">packet as containing
    the response code for the AUTH TLS request.</span>
    <span style="background-color:rgb(255, 255, 255)">
    
    </span>
    <span style="background-color:rgb(255, 255, 255)">
    
    </span>
    <span style="background-color:rgb(255, 255, 255)">If this packet
    does not have a status code of 234 then the </span><span
    style="background-color:rgb(255, 255, 255)">product will
    interpret this as a failure to switch to TLS and </span><span
    style="background-color:rgb(255, 255, 255)">will immediately
    close the command socket resulting in an </span><span
    style="background-color:rgb(255, 255, 255)">exception like the
    following:                                  </span>
    <span style="background-color:rgb(255, 255, 255)">
    
    </span>
    <span style="background-color:rgb(255, 255, 255)">
    
    </span>
    <span style="background-color:rgb(255, 255, 255)">BIP3384E: File
    node ''File Read1'' in message flow </span><span
    style="background-color:rgb(255, 255, 255)">''Nec_Customer''. An
    unexpected </span><span style="background-color:rgb(255, 255,
    255)">reply has been received from ''FTPS'' server ''hostName'.
    The  </span><span style="background-color:rgb(255, 255,
    255)">command and reply are: ''Negative response received on
    AUTH: </span><span style="background-color:rgb(255, 255,
    255)">220''.               </span>
    

Problem conclusion

  • The File Nodes now correctly recognise multi-packet welcome
    messages from FTPS servers and this error no longer occurs.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v10.0      10.0.0.18
    v11.0      11.0.0.6
    
    The latest available maintenance can be obtained from:
    http://www-01.ibm.com/support/docview.wss?rs=849&uid=swg27006041
    
    If the maintenance level is not yet available,information on
    its planned availability can be found on:
    http://www-1.ibm.com/support/docview.wss?rs=849&uid=swg27006308
    ---------------------------------------------------------------
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT29784

  • Reported component name

    INTEGRATION BUS

  • Reported component ID

    5724J0540

  • Reported release

    A00

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-07-19

  • Closed date

    2019-09-30

  • Last modified date

    2019-09-30

  • 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

    INTEGRATION BUS

  • Fixed component ID

    5724J0540

Applicable component levels

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSNQK6","label":"IBM Integration Bus"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"10.0","Edition":"","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
30 September 2019