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How to FTP through a SOCKS proxy |
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SOCKS
is a protocol that many proxy servers use to communicate with clients.
It allows
computers behind a firewall to communicate with computers outside the
firewall. During this
communication the proxy server acts as a relay for information sent in
both directions. Please
refer to the topic SOCKS
Proxies for more information on this.
To
direct socket communications via the SOCKS proxy, the FTPClient.initSOCKS() static method must be
called. If username/password authentication is required,
FTPClient.initSOCKSAuthentication() can be used to set the username and password
for the SOCKS server. An example is shown below:
FTPClient.initSOCKS("9091", "socksserver");
FTPClient.initSOCKSAuthentication("proxyuser", "proxypassword");
Note that these static
methods set the
SOCKS properties for the entire Java Virtual Machine – it is
not currently possible to set them for a specific instance.
This could be especially problematic if used within an application
server. A future release will remove this 'feature'.