You use a Windows Vista-based or Windows Server 2008-based computer that is behind a Network Address Translation (NAT) device. When you use this computer to try to communicate with another computer through an Internet Protocol security (IPsec) tunnel-mode connection, the connection fails.

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On a Windows Vista-based computer, when you try to communicate with another computer through an Internet Protocol security (IPsec) tunnel-mode connection, the connection fails.

This issue occurs if the Windows Vista-based computer is behind a Network Address Translation (NAT) device.