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https://issues.apache.org/jira/browse/CASSANDRA-15048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17679261#comment-17679261
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Scott Guminy commented on CASSANDRA-15048:
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Thanks. I was able to get it to start with {_}protocol: TLSv1.3{_}. Didn't
get any errors on startup. I scanned the port with a tool and it was able to
detect TLSv1.3 correctly. Seems like it might "just work".
> Upgrade Netty to support TLS 1.3
> --------------------------------
>
> Key: CASSANDRA-15048
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15048
> Project: Cassandra
> Issue Type: Improvement
> Components: Feature/Encryption
> Reporter: Michaël Figuière
> Priority: Low
>
> TLS 1.3 support has been [added to Netty
> 4.1.31|https://netty.io/news/2018/10/30/4-1-31-Final.html]. As the Cassandra
> trunk is already relying on Netty 4.1.28, it would take a patch version
> upgrade and a \{{SslContext}} configuration change for Cassandra 4.0 to
> support TLS 1.3.
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