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https://issues.apache.org/jira/browse/HADOOP-16000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16718486#comment-16718486
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Steven Rand commented on HADOOP-16000:
--------------------------------------

+1, though I think it's worth noting that {{hadoop.ssl.enabled.protocols}} has 
a limited impact until HADOOP-15169 is fixed.

> Remove TLSv1 and SSLv2Hello from the default value of 
> hadoop.ssl.enabled.protocols
> ----------------------------------------------------------------------------------
>
>                 Key: HADOOP-16000
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16000
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: security
>            Reporter: Akira Ajisaka
>            Assignee: Gabor Bota
>            Priority: Major
>
> {code:title=core-default.xml}
>   public static final String SSL_ENABLED_PROTOCOLS_DEFAULT =
>       "TLSv1,SSLv2Hello,TLSv1.1,TLSv1.2";
> {code}
> TLSv1 and SSLv2Hello are considered to be vulnerable. Let's remove these by 
> default.



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