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MF58589 - TCPIP-TELNET-UNPRED VLOG 0701005D TELNET CLIENTS DROPPED

PTF Cover Letter


PTF ( Program Temporary Fixes ) Cover letter


Order this fix

Abstract

TCPIP-TELNET-UNPRED VLOG 0701005D TELNET CLIENTS DROPPED


Pre/Co-Requisite PTF / Fix List

REQ  LICENSED      PTF/FIX  LEVEL

TYPE PROGRAM  REL  NUMBER   MIN/MAX  OPTION
---- -------- ---  -------  -------  ------
PRE  5770999  710  MF53626   00/00    0000
PRE  5770999  710  MF50881   00/00    0000
PRE  5770999  710  MF48794   00/00    0000
CO   5770999  710  MF54614   00/00    0000
DIST 5770SS1  710  SI36974   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,
including programs that circumvent control technology designed to limit
interactive capacity to purchased levels.  This PTF may be a prerequisite
for future PTFs.  By applying this PTF you authorize and agree to the
foregoing.

This PTF is subject to the terms of the 'IBM License Agreement for Machine
Code', the terms of which were provided in a printed document that was
delivered with the machine.

SUBJECT TO ANY WARRANTIES WHICH CAN NOT BE EXCLUDED OR EXCEPT AS EXPLICITLY
AGREED TO IN THE APPLICABLE LICENSE AGREEMENT OR AN APPLICABLE SUPPORT
AGREEMENT, IBM MAKES NO WARRANTIES OR CONDITIONS EITHER EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OR CONDITIONS OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON INFRINGEMENT,
REGARDING THE PTF.





APAR Error Description / Circumvention

-----------------------------------------------
Unpredictable results in seemingly valid Telnet clients results
in dropped connections for no apparent valid reason.  The Telnet
server generates VLOG 0701 005D ( 0701005D ) when an errant
Telnet client is sending valid Telnet data streams, but appears
to be stuck in a loop or sending excessive streams of Telnet
commands to process.
An error in the way this is tracked by the system can cause the
value to go below zero.  This value was an unsigned integer, but
can "underflow" and take on a huge positive value on some
systems.

CORRECTION FOR APAR MA43764 :
-----------------------------
Timing between tasks involved is triggering run away Telnet
client detection.
Sensitivity to errant Telnet clients has been corrected to
handle task timing differences due to some system differences in
task processing while still protecting from errant Telnet
clients or Denial of Service (DoS) attacks.

CIRCUMVENTION FOR APAR MA43764 :
--------------------------------
None.


Activation Instructions


None.




Special Instructions


********************************************************************
THE FOLLOWING ARE SUPERSEDED SPECIAL INSTRUCTIONS. IF THE SUPERSEDED
PTF HAS ALREADY BEEN APPLIED AND ITS SPECIAL INSTRUCTION FOLLOWED,
IT IS NOT NECESSARY TO FOLLOW THAT SPECIAL INSTRUCTION AGAIN.
********************************************************************

SPECIAL INSTRUCTIONS FOR SUPERSEDED PTF MF55933 :
=================================================

Before applying or removing this PTF, you need to end Telnet.

Use the "ENDTCPSVR *TELNET" CL command.

Then apply or remove the PTF.

Once that is complete, start Telnet using the "STRTCPSVR *TELNET" CL
command.

SPECIAL INSTRUCTIONS FOR SUPERSEDED PTF MF53665 :
=================================================

If a VT API application is currently experiencing the problem, that
program will need to end and restart to get the fix.

Before applying or removing this PTF, you need to end Telnet.

Use the "ENDTCPSVR *TELNET" CL command.

Then apply or remove the PTF.

Once that is complete, start Telnet using the "STRTCPSVR *TELNET" CL
command.

SPECIAL INSTRUCTIONS FOR SUPERSEDED PTF MF50253 :
=================================================

To apply or remove this ptf in immediate mode:

1. End the Telnet server with CL command  "ENDTCPSVR *TELNET"
2. Use ENDJOB to end all jobs with a job name of "QTVDEVICE" that
are
running in the QSYSWRK subsystem.
3. Apply or remove the PTF.
4. Re-start the Telnet server with the command "STRTCPSVR *TELNET"

SPECIAL INSTRUCTIONS FOR SUPERSEDED PTF MF48300 :
=================================================

Before applying or removing this PTF, you need to end Telnet. Use the
"ENDTCPSVR *TELNET" CL command. Then use WRKACTJOB to find all of the
jobs with a job name of QTVDEVICE in the QSYSWRK subsystem. Do an
ENDJOB with the *IMMED option on all of the QTVDEVICE jobs.

Then apply or remove the PTF. Once that is complete, start Telnet using
the "STRTCPSVR *TELNET" CL command.


Default Instructions

THIS PTF CAN BE APPLIED IMMEDIATE OR DELAYED.



Supersedes

PTF/FIX NO(S).  APAR TITLE LINE
--------------  ------------------------------------------------------------
   MF58107      F/TDTASKPAGEABLE-MSGMCH3402 MCH3402 ENTERING WRKSYSACT
   MF57402      OSP-COMM-UNPRED TELNET STOPS PROCESSING NEW CONNECTIONS
   MF57402      OSP-COMM-TCPIP-OTHER ERRANT TELNET MAY CAUSE STREAMS LEAK
   MF56844      OSP-OTHER-MSGCPDBCA9 TELNET SSL connections fail
   MF56553      OSP-MSGTCP84C6 TELNET NOT WORKING AFTER IPL TCP84C6 MESSAGE
   MF56377      F/#MSTRTNS-FLDS/IXPTN80 FFDC F/#MSTRTNS-FLDS/IXPTN80
   MF55933      OSP-COMM-TCPIP-OTHER-UNPRED TELNET KEEPALIVE TIMER SETTINGS
   MF55751      OSP-COMM-OTHER-WAIT TELNET SERVER HANG
   MF55356      OSP-COMM-TCPIP-OTHER-UNPRED ABNORMAL END OF TELNET SESSION M
   MF55271      LIC-LWS-UNPRED CPF87D3 AGAINST QTVSEVHD WITH WEBFACING
   MF54615      OSP-COMM-TCPIP-OTHER-WAIT IMPROVE FAULT TOLERANCE OF TELNET
   MF53665      LIC-COMM-TCPIP-UNPRED UNPREDICTABLE RESULTS WITH INCORRECTLY
   MF53285      LIC-COMM-TCPIP-UNPRED ERRANT TELNET CLIENTS MAY CAUSE TELNET
   MF53102      OSP-COMM-TCPIP-OTHER-UNPRED ABNORMAL TELNET CLIENT ACTIVITY
   MF53102      TCPIP-TELNET-F/QTVTNCSH-T/QTVTNCSH-RC3418-MSGTCP2548 TELNET
   MF50886      TCPIP-TELNET-F/QTVTNCSH-T/QTVTNCSH-RC3418-MSGTCP2548 STREAM
   MF50886      TCPIP-TELNET-UNPRED TELNET SESSIONS HANG AFTER CONNECTING, B
   MF50886      LIC-COMM-OTHER-WAIT INTERACTION BETWEEN NETSTAT AND TELNET C
   MF50253      TCPIP-TELNET VLOGs occur when ending and starting Telnet wit
   MF50151      TCPIP-TELNET-WAIT TELNET MAY DEADLOCK AND STOP NEW COMMUNICA
   MF49142      TCPIP-TELNET-INCORROUT TELNET SERVER WILL CLOSE THE SESSION
   MF48814      LIC-COMM-OTHER-SRC07000050-UNPRED 0700 0050 VLOG MAY BE GENE
   MF48814      OSP-PERFM TIMING ISSUE WITH SSL TELNET CONNECTION
   MF48560      OSP-OTHER-UNPRED TELNET VIA JAVA PLUG IN FAILED
   MF48300      OSP-WAIT SSL ISERIES TO ISERIES TELNET CONNECTION HANG.
   MF48300      TCPIP-TELNET-PERFM QTVDEVICE JOBS ABEND RESULTING IN 0700 00
   MF52400      OSP-SRC0701005C-UNPRED TELNET VLOG 0701 005C LOGGED DURING I

Summary Information

System..............................i
Models..............................
Release.............................V7R1M0
Licensed Program...............5770999
APAR Fixed..........................View details for APAR MA43764
Superseded by:......................View fix details for PTF MF65459
Recompile...........................N
Library.............................QSYS
MRI Feature ........................NONE
Cum Level...........................C5142710


System i Support

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Document Information

Modified date:
06 November 2014