PH01447: Improvement to SSL Closing Handshake

Fixes are available

APAR status

Closed as program error.

Error description

The SSL Channel utility method for completing the closing
handshake, flushCloseDown, currently attempts to complete
the final write n times (where n is defaulted to 30 and can
be configured by either SSL or JVM custom property). This is
done by sleeping the thread for a second before attempting
again. This can be improved by taking a timestamp prior to
entering the loop. Now, instead of doing n attempts, only
sleep the thread if the difference between current system
time and origin timestamp is not greater than the configured
property's timeout value.



When a system is already thrashing, sleeping the thread is
not guaranteed to take exactly one second, so this second
approach aims to improve the granularity of this closing
timeout.

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  IBM WebSphere Application Server Liberty    *
*                  and WebSphere Application Server            *
*                  Traditional version 8.5.5 and 9.0 users of  *
*                  SSL                                         *
****************************************************************
* PROBLEM DESCRIPTION: The SSL Channel's closing handshake     *
*                      timeout logic can be improved           *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
The SSL Channel attempts to send a final SSL close packet until
a configurable amount of time - defaulted to 30 seconds - is
met. The current implementation can be improved to increase the
accuracy of this timeout.

Problem conclusion

The SSL Channel code was modified to improve the SSL close
packet timeout.

The fix for this APAR is currently targeted for inclusion in fix
pack 8.5.5.15, 9.0.0.10, and Liberty 18.0.0.3. The Git Issue for
Open Liberty can be found here:
https://github.com/OpenLiberty/open-liberty/issues/4505.  Please
refer to the Recommended Updates page for delivery information:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980

Temporary fix

Comments

APAR Information

APAR number
PH01447
Reported component name
LIBERTY PROFILE
Reported component ID
5724J0814
Reported release
CD0
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2018-08-07
Closed date
2018-12-05
Last modified date
2018-12-05

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

Fix information

Fixed component name
LIBERTY PROFILE
Fixed component ID
5724J0814

Applicable component levels

RCD0 PSY
UP

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"CD0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
28 April 2022

Tips

PH01447: Improvement to SSL Closing Handshake

Fixes are available

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APAR status

Closed as program error.

Error description

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

APAR number

Reported component name

Reported component ID

Reported release

Status

PE

HIPER

Special Attention

Submitted date

Closed date

Last modified date

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Fix information

Fixed component name

Fixed component ID

Applicable component levels

RCD0 PSY

Document Information

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