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https://issues.apache.org/jira/browse/VFS-412?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13490309#comment-13490309
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Andreas Wallberg commented on VFS-412:
--------------------------------------
According to RFC 2228, (http://www.ietf.org/rfc/rfc2228.txt) that introduced
PROT command, "The PBSZ command must be preceded by a successful security data
exchange.". I think this means that "PBSZ 0" must be issued before "PROT P".
> [FTPS] Support to send execPROT("P")
> ------------------------------------
>
> Key: VFS-412
> URL: https://issues.apache.org/jira/browse/VFS-412
> Project: Commons VFS
> Issue Type: Improvement
> Reporter: Jose Juan Montiel
> Priority: Minor
> Labels: patch
> Attachments: patch_412.txt, patch_exexprot.txt
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> The layer over FTPSClient can't permit to send a client.execPROT("P") and
> this make in FTPS explicit (with vsFTPd 2.0.7) make an error:
> SSL version: TLSv1/SSLv3, SSL cipher: DES-CBC3-SHA, not reused, no cert
> 522 Data connections must be encrypted.
> The patch offer via FtpsFileSystemConfigBuilder the option to set execPROT
> like do with setPassiveMode.
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