Java 7 prevents FTP transfers on Windows Vista and 7 if firewall is on. Any ideas?

Question

Java 7 prevents FTP transfers on Windows Vista and 7.

In FTP, before a file is transferred a PORT or a PASV command must be sent. As soon as one of the commands is

Answer 1

Another workaround is to start the JVM with:

-Djava.net.preferIPv4Stack=true