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https://issues.apache.org/jira/browse/NET-605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15741865#comment-15741865
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Adam Lynam commented on NET-605:
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This was likely introduced by the patch in this issue:
https://issues.apache.org/jira/browse/NET-579
> FTPSClient forces IP in SubjectAlternativeNames field for server certificate
> validation instead of hostname
> -----------------------------------------------------------------------------------------------------------
>
> Key: NET-605
> URL: https://issues.apache.org/jira/browse/NET-605
> Project: Commons Net
> Issue Type: Bug
> Components: FTP
> Affects Versions: 3.5
> Reporter: Adam Lynam
>
> We have an FTP Server with a signed certificate, with both CN and SAN DNS
> entries set to the respective hostname of the machine.
> When attempting to connect using FTPSClient, we get
> java.security.cert.CertificateException: No subject alternative names
> matching IP address x.x.x.x found. The FTPSClient appears to resolve the IP
> address and pass that through the SSLSocket where it eventually raises the
> exception.
> While we initially encountered the error against our internal FTP server, we
> have confirmed the same issue against a public FTP server.
> ftps://demo:[email protected].
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