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Although WebSphere Application Server has supported the ability to use TLS 1.3 for a while, there was previously no support to specify multiple protocols. If TLS 1.3 was chosen as the protocol, only clients capable of using TLS 1.3 could connect; there was no ability to fall back to other protocols.
However, multiple protocol support has been added to WebSphere Application Server 8.5.5.21 and 9.0.5.11. For details on how to configure multiple protocols, see Step 14 on the following page:
https://www.ibm.com/docs/en/was-nd/8.5.5?topic=sc-creating-ssl-configuration
For example, you can create a "Custom protocol list" that contains both TLS 1.3 and TLS 1.2, allowing TLS 1.3 communication for clients that support it while also providing the ability to fall back to TLS 1.2 for other clients.
Already released in product https://www.ibm.com/support/pages/node/6421519
The TLS level is based on Java. Currently TLS 1.3 is enabled in Java 11 (http://openjdk.java.net/jeps/332). At some point it may be ported to Java 8. I would think at that time IBM would evaluate the use in tWAS. - Brian