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To introduce stable support for TLSv1.3, we’re switching the networking library that’s used by Openfire from MINA to Netty. This effort is documented in https://igniterealtime.atlassian.net/browse/OF-2559.
It is expected that after the migration to Netty, TLSv1.3 support will work without further work.
Java 11 brings support for TLS 1.2 and 1.3. Initial tests show that session establishment doesn't necessarily succeed.