MF68511 - LIC-COMM-TCPIP RST FOR INCOMING DATA ON CLOSED SOCKET WITH D

TYPE PROGRAM  RELEASE   NUMBER   MIN/MAX  OPTION
---- -------- --------- -------  -------  ------
CO   5770999  V7R4M0    MF67004   00/00    0000



NOTICE:
-------
Application of this PTF may disable or render ineffective programs that
use system memory addresses not generated by the IBM translator,
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foregoing.

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APAR Error Description / Circumvention

-----------------------------------------------
After the local socket is closed and TCP is lingering to send
data queued prior to the close, TCP sends a RST packet in
response to incoming data.  Secure FTP client hit this TCP
issue.  The remote FTP side sees error 426-Unable to receive
data from TCP/IP, 426-Data transfer ended.

CORRECTION FOR APAR MA48948 :
-----------------------------
The TCP code path sending the RST was updated so that if TCP is
lingering to send data queued before the local socket is closed,
it now ACKs the incoming packet up until the FIN is sent and
then acknowledged by the remote side.

CIRCUMVENTION FOR APAR MA48948 :
--------------------------------
None.


Activation Instructions


None.




Special Instructions


None.


Default Instructions

THIS PTF CAN BE APPLIED IMMEDIATE OR DELAYED.



Supersedes

PTF/FIX NO(S).  APAR TITLE LINE
--------------  ------------------------------------------------------------
   MF67397      LIC-COMM-OTHER-INCORROUT-NETSTAT DETAILS "CURRENTLY ESTABLIS
   MF67002      LIC-COMM-TCPIP QoS Enabled Memory Leak on TCP Listening Sock

Summary Information
System..............................  i
Models..............................  
Release.............................  V7R4M0
Licensed Program....................  5770999
APAR Fixed..........................  View details for APAR MA48948
Superseded by:......................  View fix details for PTF MF69956
Recompile...........................  N
Library.............................  QSYS
MRI Feature ........................  NONE
Cum Level...........................  C1238740

IBM i Support