KB961533

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.

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