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Status Not under consideration
Workspace IMS Enterprise Suite
Categories General ES
Created by Guest
Created on Aug 11, 2016

RELATED IDEAS

Support for Session ID caching in IMS Transaction Manager Resource Adaptor

We need IMS TM Resource Adapter to add support for TLS/SSL session reuse in order to reduce CPU consumption related to large numbers of full TLS/SSL handshakes.

When the IMS TM RA uses TLS/SSL to protect its connections to IMS on z/OS, it appears to not reuse previously established TLS/SSL sessions, even though the IMS server on z/OS supports session reuse through AT-TLS. Per the TLS protocol, it is the responsibility of the TLS client (IMS TM RA, in this case) to trigger session reuse by specifying the session ID of a cached TLS session on the ClientHello message. Since we have a large number of short-lived connections, every connection causes a full TLS/SSL handshake, which is computationally expensive. TLS session reuse would allow the majority of those connections to use abbreviated TLS handshakes, which will significantly reduce our CPU consumption.

The client is the one who should initiate session caching according to TLS V1.1 & TLS V1.2 RFCs, which are available here:
http://www.ietf.org/rfc/rfc4346.txt
Search for CACHE and you will find this explained on page 32 & 39
http://www.ietf.org/rfc/rfc5246.txt
Search for CACHE and you will find this explained on page 35 & 42. You may want to include these RFC numbers in the RFE.

Idea priority Urgent
  • Guest
    Reply
    |     Oct 9, 2018

    Thank you for your interest in keeping IMS a vital and successful product. Software development has continuously evolved during IMS's lifetime, and so has IMS itself. We have kept pace with, adopted, and implemented many industry standard best practices within our organization, including Continuous Delivery, Design Thinking, and Agile.

    When choosing new features to add from the list of requirements in our backlog, we assess which will bring the most value to as many clients as possible and prioritize those.

    At this time, after reviewing this request for enhancement and assessing its potential value, we have decided to reject it. The reason we are rejecting RFE ID 92908 because the original issue has been addressed with connection pooling such that the number of SSL handshaking is significantly smaller when the connection is being reused.

    If you have any further questions, please let us know.

    Thank you for your continue support with IMS.
    Haley Fung - hfung@us.ibm.com

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