Weird java.net.SocketException Permission Denied connect error when running Groovy in Intellij IDEA

Question

When running a VERY simple URL grab script from within IntelliJ IDEA, I get:

java.net.SocketException: Permission denied: connect
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Answer 1

There is a known bug in JDK 1.7 related to IPv6.

Adding -Djava.net.preferIPv4Stack=true in VM Options should fix the problem.

See also related question on this site.