PM57930: TCPCONN QUERY NETVIEW DISPLAY SHOWS INVALID ACTIVE CONNECTIONS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Connections with a duration equivalent to the MINLIFETIME timer
  are still being reported to Netview's TCPCONN QUERY display
  while in the act of transitioning to the FIN_WAIT_1/CLOSE_WAIT
  state.
  
  
  Additional symptoms:
  
  Connection Duration = MINLIFETIME timer value
  TCPCONN QUERY displays connection as active
  TCPCONN QUERYACT does not display connection
  SMFTYPE119: TCPINIT: NO   TCPTERM:  NO
  
  
  Keywords:
  
  FIN_WAIT_2, CLOSE_WAIT, LAST_ACK
  

Local fix

• Use TCPCONN QUERYACT display (Recommended Netview Display)
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of the IBM Communications Server   *
  *                 for z/OS Version 1 Release(s) 12 and 13 IP:  *
  *                 NETMONITOR TCPCONNSERVICE                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: NETMONITOR TCPCONNSERVICE may fail to   *
  *                      report connection termination.  NetView *
  *                      TCPCONN QUERY display shows connections *
  *                      that have terminated.                   *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  NETMONITOR TCPCONNSERVICE may fail to report connection
  termination.  Netview TCPCONN QUERY display shows connections
  that have terminated.
  
  The Network Monitor Interface (NMI) provides the ability to
  receive notifications when connections initiate and terminate.
  A timing condition exists where the connection termination
  notification is not being presented to the NMI.  In order for
  this condition to exist the TCP/IP profile must have
  SMFCONFIG TYPE119 NOTCPTERM coded or defaulted and
  NETMONITOR TCPCONNService MINLIFETime n.  The timing condition
  occurs when the TCP connection is closed by the remote, then
  closed by the local side and the MINLIFETIME timer expires
  while the connection is in the LASTACK state.
  
  The transition to the LASTACK state skips sending the
  termination notification to the NMI if the MINLIFETIME timer
  has not expired and sent the initiation notification.  The
  LASTACK state sets tcb_smfterm_issue whether the termination
  notification was sent or not.  The MINLIFETIME timer expiration
  while the connection is in LASTACK will send the connection
  initiation notification.  The connection will transition to the
  KLOSED state when the final ACK arrives but the termination
  notification will not be sent because tcb_smfterm_issued is set.
  +-------------------------------------------------------------+
  + Please check our Communications Server for OS/390 homepages +
  + for common networking tips and fixes.  The URL for these    +
  + homepages can be found in Informational APAR II11334.       +
  +-------------------------------------------------------------+
  

Problem conclusion

• TCSNDINT has been amended to skip setting tcb_smfterm_issued
  when a connection transitions to LASTACK and the MINLIFETIME
  timer has not reported the connection initiation to the NMI.
  
  * Cross Reference between External and Internal Names
  

Temporary fix

Comments

APAR Information

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

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

  UK76891 UK76892

Modules/Macros

• EZBTCFWR EZBTCSND EZBTLFWR EZBT6FWR EZBT6LWR
  EZBT6SND TCSNDINT T6SNDINT
  

Fix information

• Fixed component name

  TCP/IP V3 MVS

• Fixed component ID

  5655HAL00

Applicable component levels

• R1C0 PSY UK76891

     UP12/04/07 P F204

• R1D0 PSY UK76892

     UP12/04/07 P F204

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.