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https://issues.apache.org/jira/browse/NET-354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13029161#comment-13029161
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Leif John Korshavn commented on NET-354:
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Finally I got a download from GlobalScape. I have installed their EFT Server
6.3.0 for trial on Windows. I have been able to reproduce Ericks result, and I
have some interesting observations:
Apache FTPS client (rel 2.2) implicit mode -> CCC OK
Apache FTPS client (rel 2.2) explicit mode -> CCC OK
Apache FTPS client (3.0-SNAPSHOT) implicit mode -> CCC FAILS!
Apache FTPS client (3.0-SNAPSHOT) explicit mode -> CCC FAILS!
So this means that Erick indeed has discovered some new behaviour introduced in
the current snapshot (i.e. my patch). It also applies to explicit mode. I will
investigate further.
> FTPSClient not properly supporting CCC and PROT P
> -------------------------------------------------
>
> Key: NET-354
> URL: https://issues.apache.org/jira/browse/NET-354
> Project: Commons Net
> Issue Type: Bug
> Components: FTP
> Affects Versions: 2.2
> Environment: Applies to all environments
> Reporter: Leif John Korshavn
> Fix For: 3.0
>
> Attachments: CCCTester.java, CCC_bugs_in_FTPSClient.patch
>
>
> FTPSClient does not behave properly after issuing CCC (Clear Command
> Channel). Proper behaviour is to close SSLSocket, but keep underlying
> connection without SSL open.
> To achieve this, the SSLSocket should be created with "false", like this on
> line 255 (of FTPSClient v2.2)
> SSLSocket socket =
> (SSLSocket) ssf.createSocket(_socket_, ip, port, false);
> Furthermore, on sendCommand CCC, sslSocket must be closed before setting
> _socket = _plainsocket on line 493:
> _socket.close();
> _socket = _plainsocket;
> ...
> And finally, it is wrong to set socket factory to null on line 500 of the
> same method; this is set properly in exexPROT and should not be reset on CCC.
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