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If you don't have a connection to the internet setup before you go to autoupdate, the update fails off-cource.. If you make a connection and try to autoupdate again, is still can't find the hostname. You have to restart netbeans to get this working again. (I've been trying to "autoupdate' a lot lately, but see for that the other "bug" submission.
This is JDK problem, see BugParade #4026938