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ITsVISTA KB-Link: KB961533

When you use an IPsec rule to block traffic from any IP address to any other IP address, the Self-to-Self connection may be blocked on a Windows Vista-based or a Windows Server 2008-based client computer

In the network work environment, an IP security (IPsec) rule is used to block traffic between a source address of “Any IP Address” to a destination address of “Any IP Address.” In this scenario, on a Windows Vista or Windows Server 2008-based client computer, the Self-to-Self connection may be blocked if the connection uses an IPv4 address.

For example, if you use the ping.exe command to ping LocalHost or any IPv4 address that is assigned to the computer, the operation may fail.

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 KB961533.

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