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https://issues.apache.org/jira/browse/NET-293?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sebb resolved NET-293.
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Resolution: Not A Problem
Not all servers seem to require PBSZ/PROT P.
For those that do, the user can always send the commands.
> Should FTPSClient set "PBSZ 0" and "PROT P" for FTPS connections
> ----------------------------------------------------------------
>
> Key: NET-293
> URL: https://issues.apache.org/jira/browse/NET-293
> Project: Commons Net
> Issue Type: Improvement
> Components: FTP
> Affects Versions: 2.0
> Reporter: Sean Owen
> Priority: Minor
>
> I don't know enough about the FTPS spec to know whether this is a bug or not
> -- somehow thinking not. But I spent some time debugging a connection to an
> FTPS server and in the end discovered that it would only work if the
> following commands were sent after login:
> PBSZ 0
> PROT P
> Otherwise it would fail with "426 Transfer Aborted" after the file transfer
> began.
> I note that another FTPS desktop client I have did specify these and
> succeeded, which is the only thing that prompted me to wonder whether this
> should be set by default by FTPSClient.
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