Cannot connect socket through socks proxy

Hi,
I'm having problems connecting a socket through a socks proxy. I'm using the Apache Commons FTPClient, which I understand uses the standard java.net.Socket:
System.setProperty("socksProxyHost", proxyUrl);
System.setProperty("socksProxyPort", proxyPort);
FTPClient ftp = new FTPClient();
try {
ftp.connect(url);
...When I run this, the whole thing just hangs. However, using a standalone FTP client (SmartFTP) configured with the same settings works fine.
Analysing the network traffic (using Ethereal) reveals the following:
Frame 4 off the successful connection (SmartFTP) contains ethernet, IP, TCP and Socks data. The socks data is 9 bytes long and looks perfectly normal.
Frame 4 of the unsuccessful connection contains the same 4 data segments, but the socks data is only 1 byte long and contains only the socks version number. Ethereal reports this as "Unreassembled Packet (incorrect TCP checksum)".
Is there anything I'm missing here? I've tried setting the proxy information on the command line when I run the test (java -DsocksProxyHost=proxy -DsocksProxyPort=1080) but that appeared to make no difference.
Any pointers much appreciated, as I'm really stumped here!
Thanks

hi baarney,
I am not very clear what you mean. Could you tell me more about it because
I have the same problem. And after connecting for a long time, I received this message "Malformed message from SOCKS server"
Forgot to add:
Running on Windows XP
java version "1.4.2_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_06-b03)
Java HotSpot(TM) Client VM (build 1.4.2_06-b03, mixed mode)Thanks

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Post Moved Cannot-connect-through-anonymous-prox...

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