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https://issues.apache.org/jira/browse/CASSANDRA-17923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17613564#comment-17613564
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Jon Meredith commented on CASSANDRA-17923:
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+1 from me too.
> Mixed mode support for internode authentication during TLS upgrades
> -------------------------------------------------------------------
>
> Key: CASSANDRA-17923
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17923
> Project: Cassandra
> Issue Type: New Feature
> Components: Messaging/Internode
> Reporter: Jyothsna Konisa
> Assignee: Jyothsna Konisa
> Priority: Normal
>
> During upgrades from "non-ssl -> ssl" or "ssl-mTLS" the cluster should be
> able to function in mixed mode with some nodes supporting "non-ssl"
> authentication and the new nodes supporting "mTLS" authentication. Currently
> we do not have this supported and because of which upgrades are not possible
> for upgrading internode authentication strategies.
> If a node is configured in optional mode for internode connections, retry
> with other SSL strategies If the node is not able to connect to other nodes
> due to authentication problems.
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