Hello, a while back I brought up the discussion that there is no preferIPV6=system (or similar) setting which allows to turn off the reordering of address families by Java. Because only the OS can try to correctly do target address determinaton.
A Bug was opened and it was excluded from Java 8 - would there be a window for Java 9, still? https://bugs.openjdk.java.net/browse/JDK-8016521 Gruss Bernd