Why do I need java.net.preferIPv4Stack=true only on some windows 7 systems?

Question

I have used Java on Windows 7 (64bit) machines for quite some time and have never had problems with not being able to create a network connection. Now on the systems at the

Answer 1

Just my contribution:

Disabling all the ipv6 on the network devices solved it for me.

I hope this helps