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https://issues.apache.org/jira/browse/KAFKA-15053?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Divij Vaidya resolved KAFKA-15053.
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Reviewer: Divij Vaidya
Resolution: Fixed
> Regression for security.protocol validation starting from 3.3.0
> ---------------------------------------------------------------
>
> Key: KAFKA-15053
> URL: https://issues.apache.org/jira/browse/KAFKA-15053
> Project: Kafka
> Issue Type: Bug
> Components: clients
> Affects Versions: 3.3.0
> Reporter: Bo Gao
> Assignee: Bo Gao
> Priority: Major
> Labels: backport
> Fix For: 3.3.3, 3.6.0, 3.5.1, 3.4.2
>
>
> [This|https://issues.apache.org/jira/browse/KAFKA-13793] Jira issue
> introduced validations on multiple configs. As a consequence, config
> {{security.protocol}} now only allows upper case values such as PLAINTEXT,
> SSL, SASL_PLAINTEXT, SASL_SSL. Before this change, lower case values like
> sasl_ssl, ssl are also supported, there's even a case insensitive logic
> inside
> [SecurityProtocol|https://github.com/apache/kafka/blob/146a6976aed0d9f90c70b6f21dca8b887cc34e71/clients/src/main/java/org/apache/kafka/common/security/auth/SecurityProtocol.java#L70-L73]
> to handle the lower case values.
> I think we should treat this as a regression bug since we don't support lower
> case values anymore since 3.3.0. For versions later than 3.3.0, we are
> getting error like this when using lower case value sasl_ssl
> {{Invalid value sasl_ssl for configuration security.protocol: String must be
> one of: PLAINTEXT, SSL, SASL_PLAINTEXT, SASL_SSL}}
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