[NET-637] FTPSClient not using the Socks Proxy when opening passive data connection

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 3.5, 3.6
• Component/s: FTP

Environment

Windows

• Assignee: Unassigned
• Reporter: Michael Seganti
• Created: 01/Jun/17 18:05
• Updated: 08/Feb/18 14:15

Description

I'm routing FTPS traffic through a SOCKS proxy host. I setup the proxy using:

FTPSClient ftps = new FTPSClient("TLS", false);
InetSocketAddress sa = new InetSocketAddress(proxyHost,proxyPort);
Proxy proxy = new Proxy(Proxy.Type.SOCKS, sa);
System.out.println("Using Proxy Server: " + proxy);
ftps.setProxy(proxy);
...
ftps.enterLocalPassiveMode();
for (FTPFile f : ftps.listFiles()) {
System.out.println(f.getRawListing());
}

When establishing the connection, the above code does go through the proxy and I'm able to login. When I try to do anything, say listFiles, It does the SYST and then attempts to enter passive mode, but the connection times out:
227 Entering Passive Mode (123,45,678,9,11,243)
java.net.ConnectException: Connection timed out: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at sun.security.ssl.SSLSocketImpl.connect(Unknown Source)
at org.apache.commons.net.ftp.FTPClient.openDataConnection(FTPClient.java:920)
at org.apache.commons.net.ftp.FTPSClient.openDataConnection(FTPSClient.java:627)
at org.apache.commons.net.ftp.FTPClient.openDataConnection(FTPClient.java:785)
at org.apache.commons.net.ftp.FTPClient.initiateListParsing(FTPClient.java:3409)
at org.apache.commons.net.ftp.FTPClient.initiateListParsing(FTPClient.java:3339)
at org.apache.commons.net.ftp.FTPClient.listFiles(FTPClient.java:3016)
at gov.nyc.ftputils.FTPConnection.listFiles(FTPConnection.java:1270)
at gov.nyc.ftputils.FTPClientUtil.main(FTPClientUtil.java:572)

I then comment out the proxy code and added:

System.getProperties().put( "socksProxyPort", proxyPort);
System.getProperties().put( "socksProxyHost" ,proxyHost);

And then I'm able to get the listing, get files, etc.

Adding -DsocksProxyHost=myproxy.host to the java command line also works.

Issue Links

• is related to: NET-642 FTPSClient execPROT removes proxy settings