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ITsVISTA KB-Link: KB2569391

IPv6 DAD state does not switch back to Preferred state from Deprecated state in Windows Vista, in Windows Server 2008, in Windows 7, or in Windows Server 2008 R2

Assume that you use an IPv6 address on a computer that is running Windows Vista, Windows Server 2008, Windows 7, or Windows Server 2008 R2. If the IPv6 address falls into Deprecated state under certain situations (for example, no router advertisement (RA) message is received on the computer within the preferred lifetime), the IPv6 Duplicate Address Detection (DAD) state does not switch back to Preferred state even if the situations are resolved.

There is a download that resolves this issue. See Hotfixes for details.
32-bit Download: Contact Microsoft
64-Bit Download: Contact Microsoft

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB2569391.

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