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https://issues.apache.org/jira/browse/CASSANDRA-15727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17083758#comment-17083758
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Jon Meredith commented on CASSANDRA-15727:
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CircleCI
[Java8|https://circleci.com/workflow-run/4db87bd0-acc6-48e8-afcc-d259841af5c2]
[Java11|https://circleci.com/workflow-run/f2969704-8d9b-4d9e-9af4-0f59186b08d5]
> Internode messaging connection setup between 4.0 and legacy SSL 3.0 fails if
> initial connection version incorrect
> -----------------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-15727
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15727
> Project: Cassandra
> Issue Type: Bug
> Components: Messaging/Internode
> Reporter: Jon Meredith
> Assignee: Jon Meredith
> Priority: Normal
> Labels: pull-request-available
> Fix For: 4.0-beta
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> This was discovered while testing upgrading an SSL enabled cluster from 3.0
> to 4.0. The 3.0 cluster was configured to only listen on the ssl storage
> port. When the upgraded 4.0 node started it received a gossip messsage that
> triggered a shadow round before it had correctly set the messaging versions
> for the other endpoints.
> Sending the message created the connection, but because the endpoint
> defaulted to {code}VERSION_40{code} the initial connect attempt was to the
> regular {code}storage_port{code}. The 3.0 node was only listening on the
> {code}ssl_storage_port{code}, so the connection was refused and the
> {code}OutboundCOnnection.onFailure{code} handler was called. As the shadow
> gossip round had queued up a message, the {code}hasPending{code} branch was
> followed and the connection was rescheduled, however the port is never
> recalculated as the original settings are used so it always fails.
> Meanwhile, the node discovered information about peers through inbound
> connection and gossip updating the messaging version for the endpoint which
> could have been used to make a valid connection.
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