JR44762: CSWIN - TRAP IN TN3270 SERVER

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Communications Server for Windows
    ---------------------------------
    TN3270 clients lose connection to the server. On the server, Dr.
    Watson logs a trap:
    
    Application exception occurred:
    App: TN3270WN.EXE (pid=4868)
    Exception number: c0000005 (access violation)
    

Local fix

  • Restart the server.
    

Problem summary

  • The trap data shows two problems:
    1) If a client sends in multiple connection requests too
    quickly, a memory initialization bug can be hit, because a
    certain control block was not being initialized properly. This
    could lead to an attempt to re-use an expired semaphore, causing
    the trap.
    
    2) This was exposed by fixing problem (1). If a client requestes
    an LU that is not defined on the host, the server may return the
    error response without waiting for internal processing to
    complete. If the request is repeated too quickly, it could
    overwrite the first request and cause the server to hang.
    

Problem conclusion

  • Code has been corrected to properly initialize the control block
    at each new client connection. Code has also been corrected to
    prevent conflict with multiple requests for a non-existant LU.
    

Temporary fix

  • TN3270WN.EXE
    TN3270D.DLL
    

Comments

APAR Information

  • APAR number

    JR44762

  • Reported component name

    COMM SERV NT 6.

  • Reported component ID

    5639F2503

  • Reported release

    640

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-11-15

  • Closed date

    2012-11-15

  • Last modified date

    2012-11-15

  • APAR is sysrouted FROM one or more of the following:

    JR41157

  • APAR is sysrouted TO one or more of the following:

Fix information

  • Fixed component name

    COMM SERV NT 6.

  • Fixed component ID

    5639F2503

Applicable component levels

  • R640 PSY

       



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Document information


More support for:

Communications Server for Windows

Software version:

640

Reference #:

JR44762

Modified date:

2012-11-15

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