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As well as via apar PH20063 on V5.4 and V5.5, this RFE is satisfied by CICS Transaction Server for z/OS V5.6 which is Generally Available today 12th June 2020.
For more information see the CICS TS V5.6 Knowledge Center https://www.ibm.com/support/knowledgecenter/SSGMCP_5.6.0/whats-new/intro.html#intro__TLS-enhancement
This RFE is also satisfied by CICS Transaction Server for z/OS V5.6 which is announced today 7th April 2020 and which has a planned availability date of 12th June 2020.
For more information see the CICS TS V5.6 announcement letter
https://www-01.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/7/897/ENUS220-077/index.html&request_locale=en
SNI support has been made available via apar PH20063 on CICS TS 5.3, 5.4 and 5.5.
With this enhancement, CICS TS, when acting as an HTTP client, can use a TLS connection to a virtual host where the server supports multiple virtual hosts using a single IP address.
No configuration change is required in CICS TS. CICS TS supports SNI if it is supported by the HTTP server.
This is something we would like to address. The RFE is being moved into 'Planned for Future release' status. Please note:
IBM’s statements regarding its plans, directions, and intent are subject to change or withdrawal without notice at IBM’s sole discretion. Information regarding potential future products is intended to outline our general product direction and it should not be relied on in making a purchasing decision. The information mentioned regarding potential future products is not a commitment, promise, or legal obligation to deliver any material, code or functionality. Information about potential future products may not be incorporated into any contract. The development, release, and timing of any future features or functionality described for our products remains at our sole discretion.
We need this support as well to connect to the cloud.
This is becoming a bigger problem now. Internal and external servers are using SNI and CICS will not support it.
One of our customer needs this functionality because the server on which the webservice application is running is configured as 'Name based virtual host' with several certificates. To get the right certificate the client must support TLS SNI otherwise it gets a default certificate and not the one specified in hostname“ („common name check“). It is also a question of security.