A customer found an exception in IPv4 and an abort in IPv6 environment.

1. IPv4
(1) JDK5u24
java.net.SocketException: Protocol family unavailable
        at sun.nio.ch.Net.connect(Native Method)
        at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:464)
        at Test.main(Test.java:42)

(2) JDK6.0u21
java.net.SocketException: Protocol family unavailable
        at sun.nio.ch.Net.connect(Native Method)
        at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:507)
        at Test.main(Test.java:42)

2. IPv6
(1) JDK5.0u24
#
# An unexpected error has been detected by HotSpot Virtual Machine:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x6d7d0e13, pid=1848, tid=3344
#
# Java VM: Java HotSpot(TM) Client VM (1.5.0_24-b02 mixed mode)
# Problematic frame:
# V [jvm.dll+0x90e13]
#
# An error report file with more information is saved as hs_err_pid1848.log
#
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
#

(2) JDK6.0u21
#
# A fatal error has been detected by the Java Runtime Environment:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x6d9b88a8, pid=3884, tid=2692
#
# JRE version: 6.0_21-b07
# Java VM: Java HotSpot(TM) Client VM (17.0-b17 mixed mode windows-x86 )
# Problematic frame:
# V [jvm.dll+0x1088a8]
#
# An error report file with more information is saved as:
# D:\work\Support_0831\hs_err_pid3884.log
#
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
#

The customer has sent a possible cause of this problem.
Please see the comment seciton.