OA07890: IST1430I REASON FOR INOP IS XID OR LDLC COMMAND TIMEOUT ENTERPRISE EXTENDER DIAL FAILURE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• IST590I CONNECTOUT ESTABLISHED FOR PU CNV0002F ON LINE LV41000
  IST1411I INOP GENERATED FOR LV41000
  IST1430I REASON FOR INOP IS XID OR LDLC COMMAND TIMEOUT
  IST314I  END
  IST259I  INOP RECEIVED FOR CNV0002F CODE = 01
  IST1416I  ID = CNV0002F          FAILED - RECOVERY IN PROGRESS
  IST1136I  VARY INACT CNV0002F          SCHEDULED
  IST1196I  APPN CONNECTION FOR xxxx.xxxx IS INACTIVE - TGN = 21
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All using Enterprise Extender connections    *
  *                 whose IP route utilizes an OSA adaptor       *
  *                 configured in LCS mode.                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: Enterprise Extender connection          *
  *                      times out when trying to dial           *
  *                      partner.                                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The problem is summarized as follows:
  
  1) An Enterprise Extender (EE) connection initiates a dial
     request to contact the partner node.
  2) The IP route being used by this EE connection traverses
     an OSA adaptor configured in LCS mode.
  3) During EE activation, XID3s are exchanged by each partner.
  4) The EE activation proceeds to a point where the
     XID_Done_Req or XID_Done_Rsp is sent to the partner.
  5) EE successfully builds the signal and issues the IUTIL
     macro to send it to the TCP stack for routing.
  6) When the TCP stack sends the packet over the OSA
     connection, the packet is discarded by ISTTCCXB with
     reason code 5.
  7) The signal is retransmitted SRQRETRY number of times, each
     time resulting in the discard by ISTTCCXB.
  8) The EE connection INOPs as a result:
  
  IST1411I INOP GENERATED FOR LV41000
  IST1430I REASON FOR INOP IS XID OR LDLC COMMAND TIMEOUT
  IST314I  END
  IST259I  INOP RECEIVED FOR CNV0002F CODE = 01
  IST1416I  ID = CNV0002F          FAILED - RECOVERY IN PROGRESS
  IST1136I  VARY INACT CNV0002F          SCHEDULED
  IST1196I  APPN CONNECTION FOR xxxx.xxxx IS INACTIVE - TGN = 21
  
  Note: A TCP/IP CTRACE revealed an exception entry cut by
  EZBIFOUT with reason !Ethernet Padding Error.
  

Problem conclusion

• TCP/IP module EZBIFOUT requires at least one XBFLENT be
  available when an EE connection utilizes a OSA adaptor
  configured in LCS mode.  In this problem, an XBFLENT
  was not available for the small LDLC signal.  The
  XBFLENT is used by EZBIFOUT to pad the data to a
  specified minimum packet size required by the
  adaptor.  In this case, the XBFLENT was not available,
  leading to the discard in ISTTCCXB.
  
  To resolve this issue the following changes have been
  made:
  
  The GETTIPAC macro has been modified to allow for
  four available XBUFLENTs to be used for data payload for
  EE connections.  This allows for one free XBUFLENT
  for TCP/IP for OSA padding should it be required.
  
  The following modules have been recompiled to
  pick up the GETTIPAC macro changes:
  
  ISTAUCCL
  ISTAUCCR
  ISTAUCIL
  ISTAUCIR
  ISTAUCOL
  ISTAUCOR
  ISTAUCUL
  ISTAUCXF
  
  The following modules have been included for maintenance
  purposes:
  
  ISTALCSX ISTALCSF ISTAUCLA
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

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

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

  UA11581 UA11582 UA11583 UA11584

Modules/Macros

• GETTIPAC ISTALCSF ISTALCSX ISTAUCCL ISTAUCCR
  ISTAUCIL ISTAUCIR ISTAUCLA ISTAUCOL ISTAUCOR ISTAUCUL ISTAUCXF
  

Fix information

• Fixed component name

  VTAM V4 MVS/ESA

• Fixed component ID

  569511701

Applicable component levels

• R120 PSY UA11581

     UP04/06/24 P F406 Ž

• R140 PSY UA11582

     UP04/06/24 P F406 Ž

• R150 PSY UA11583

     UP04/06/24 P F406 Ž

• R160 PSY UA11584

     UP04/06/24 P F406 Ž

Fix is available

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