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https://issues.apache.org/jira/browse/AMBARI-2376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13682156#comment-13682156
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Andrii Tkach commented on AMBARI-2376:
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+1 for the patch.
> Install Options page: add warnings for invalid characters in hostnames (such
> as _) or IP addresses
> --------------------------------------------------------------------------------------------------
>
> Key: AMBARI-2376
> URL: https://issues.apache.org/jira/browse/AMBARI-2376
> Project: Ambari
> Issue Type: Bug
> Components: client
> Reporter: Oleg Nechiporenko
> Assignee: Oleg Nechiporenko
> Fix For: 1.2.5
>
> Attachments: AMBARI-2376.patch
>
>
> Make sure that the host names entered conform to RFC-952 / RFC-1123.
> Give warnings for hostnames entered as IP addresses or are not proper FQDNs
> (contains no dots).
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