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https://issues.apache.org/jira/browse/NET-658?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xinfeng.Chen resolved NET-658.
------------------------------
Resolution: Not A Bug
I inspected the codes and found that there is a method which can set port range
to avoid this. Sorry!
> FTPClient.retrieveFile hang due to data connection failure
> ----------------------------------------------------------
>
> Key: NET-658
> URL: https://issues.apache.org/jira/browse/NET-658
> Project: Commons Net
> Issue Type: Bug
> Components: FTP
> Affects Versions: 3.6
> Environment: Server:
> FileZilla Server 0.9.60 beta
> windows 10 x64
>
> Client:
> Linux 3.10.0-327.el7.x86_64 #1 SMP Thu Nov 19 22:10:57 UTC 2015 x86_64 x86_64
> x86_64 GNU/Linux
> java 1.8.0_11
>
>
> Reporter: Xinfeng.Chen
> Priority: Major
> Attachments: 2018-3-2 17-02-57.png
>
>
> When retrieving files from FTP server, the client will open a data connection
> with an in-use port and failed in server, but the client hung in this
> function(no error, no exception, even the connection is closed due to timeout
> by server). This will occur after successfully getting hundreds of files (I
> have more than 4000 small files to be transferred, it will fail after 100+ or
> 300+ or 400+ files. It always fail to FTP 4000 small files.)
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