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https://issues.apache.org/jira/browse/NET-468?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bogdan Drozdowski updated NET-468:
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    Attachment: sockclient-proxy7.diff

Finally got some time to work on this. The new patch includes a simple 
functional test that connects to an FTP server through a Socks proxy. HTTP 
proxies don't seem to work for raw Sockets (the constructor throws an 
Exeption), at least for me, but maybe I'm doing something wrong. The test in 
its current form requires a Java-compatible Socks proxy server on 
127.0.0.1:9050. Dante proxy fails (Java can't read its replies), Tor proxy 
works.
                
> Request for native support for socks proxy routing with Commons net FTP
> -----------------------------------------------------------------------
>
>                 Key: NET-468
>                 URL: https://issues.apache.org/jira/browse/NET-468
>             Project: Commons Net
>          Issue Type: Improvement
>          Components: FTP
>    Affects Versions: 1.4, 2.0, 3.0.1, 3.1
>         Environment: We use commons net  in out products for all 
> communication to an FTP server. OS : All. No other environment specifications.
>            Reporter: Ramya Rajendiran
>         Attachments: sockclient-proxy3.diff, sockclient-proxy4.diff, 
> sockclient-proxy5.diff, sockclient-proxy6.diff, sockclient-proxy7.diff
>
>
> Commons net currently does not natively support connection to an FTP server 
> via a socks proxy. The only way of achieving this would be to work at the 
> socket level as observed here 
> http://wiki.apache.org/commons/Net/FrequentlyAskedQuestions. (by setting JVM 
> properties socksProxyPort and socksProxyPortHost)
> However, a major side effect of this all connections on this JVM will go 
> through the socks proxy since this setting is at the JVM level. This is 
> sometimes undesirable as the business requirements are such that only certain 
> applications on the JVM need to go through the socks proxy. There are no 
> existing workarounds to conditionally prevent other applications to not be 
> routed through the socks proxy. This makes our application which consumes the 
> commons net unusable for such businesses.
> Providing native support for socks proxy with commons net for FTP, will go a 
> long way in supporting such common scenarios and business continuity. 
> Therefore raising this enhancement request. 

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