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https://issues.apache.org/jira/browse/NET-459?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13258318#comment-13258318
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Sebb commented on NET-459:
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Where exactly does the method block?
Can you take a thread dump to see?
> FTPClient.storeFile never returns in active mode if data channel cannot be
> established
> --------------------------------------------------------------------------------------
>
> Key: NET-459
> URL: https://issues.apache.org/jira/browse/NET-459
> Project: Commons Net
> Issue Type: Bug
> Components: FTP
> Affects Versions: 3.0.1, 3.1
> Reporter: Jaroslav Chmurny
>
> FTPClient.storeFile(String, InputStream) method is used to upload a file to
> the FTP server. Before the upload, active mode is chosen via the
> FTPClient.enterLocalActiveMode() method. However, the FTP server is not able
> to establish the data channel to the FTP client (for instance because of
> firewall). The storeFile method blocks and never returns. When I capture the
> network traffic with Wireshark, I see that there are two responses to the
> STOR command: the first one indicates that the data channel is going to be
> established, the second one indicates that the FTP server cannot establish
> the data channel. However, the storeFile method remains blocked forever, even
> if I play around with the various timeouts (setSoTimeout, setDefaultTimeout,
> setControlKeepAliveTimeout, setControlKeepAliveReplyTimeout).
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