By default, IPv6 is enabled in Windows Server 2008. If you want to disable IPv6 for any reason – perhaps you have some VMs you want to exclude for testing, you have to use Registry Editor to completely disable IPv6.

For those who prefer not to muck about in the Registry, or who’s organizations have sensible policy forbidding such things, just get Microsoft to FixIt:

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http://support.microsoft.com/kb/929852/