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https://issues.apache.org/jira/browse/NET-313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12885632#action_12885632
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Don Goertzen commented on NET-313:
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Encountered issue with EPRT incorrectly sending port as "0" instead of the
actual port that the ServerSocket is listening on. This is always going to
fail, and normally would fall back to the PORT command. However, in my case the
FTP server (FileZilla) is terminating the connection when it encounters the
invalid EPRT command rather than returning an error response, so the PORT
command never even gets a chance to run. As mentioned in the description,
server.getLocalPort() should be used here, rather than getActivePort().
> FTP: EPRT fails + EPRT/EPSV issues
> ----------------------------------
>
> Key: NET-313
> URL: https://issues.apache.org/jira/browse/NET-313
> Project: Commons Net
> Issue Type: Bug
> Affects Versions: 2.1
> Environment: FTP server = vsftpd/Centos 5.4
> FTPClient = commons-net (FTPClient) ;)
> Network = IPv4
> Reporter: Felix Bolte
> Attachments: ftp_nat.patch
>
>
> as implemented in NET-288, the client can work now via IPv6 ... EPSV is not
> only useful on IPv6 but also when NAT is enabled (see [RFC
> 2428|http://tools.ietf.org/html/rfc2428])
> what my patch does:
> * (re)enable EPSV command on IPv4 too (i dont know why
> [~rwins...@eircom.net] removed it from the supplied patch in NET-288), also
> see my comments in patch
> * sending EPRT only if we are over IPv6, cause there is no advantage over
> PORT on IPv4, it could even have disadvantages (see comments in patch)
> * EPRT was sending the result of getActivePort() to the server, but when
> there was no activePortRange set, it did send 0 as default which leads to an
> error on server site:
> {quote}
> Tue Mar 23 17:17:20 2010 [pid 10581] [ftpuser] FTP command: Client
> "192.168.11.130", "EPRT |1|192.168.11.130|0|"
> Tue Mar 23 17:17:20 2010 [pid 10581] [ftpuser] FTP response: Client
> "192.168.11.130", "500 Illegal EPRT command."
> {quote}
> * and even calling getActivePort() has no sense here, cause that port is
> used to be random, but we should send same port where the ServerSocket is
> listening on -> server.getLocalPort()
> * getActivePort() checks if __activeMaxPort > __activeMinPort, but when i
> want to set a range of only one single port (min==max) it would return 0 ...
> now it will check if equal and return __activeMaxPort
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